Exterior Insulation and Finish Systems (EIFS)
Neutrality remake campaign: from-scratch field derivation per authoring cheatsheet; project parameters and derived dispositions
Showing changes from Rev 7
to Rev 8
in Exterior Insulation and Finish Systems (EIFS).
−---
−title: Exterior Insulation and Finish Systems (EIFS)
−category: Building Envelope
−toc_depth: 3
−description: >
− When to use: Exterior insulation and finish systems (EIFS) installed as the above-grade exterior wall cladding of commercial, institutional, and multifamily buildings. This standard covers modern Class PB (polymer-based) water-managed EIFS with drainage — the code-acceptable contemporary system that combines a continuous exterior expanded-polystyrene insulation board, a thin glass-fiber-mesh-reinforced base coat, and an acrylic finish coat over a drained cavity and a water-resistive barrier on the sheathing. Addresses the full layered assembly: the exterior sheathing substrate (typically glass-mat gypsum), the water-resistive barrier and its integration with the air barrier, the drainage cavity and drainage efficiency, the EPS insulation board and its attachment, the reinforced base coat and the standard-through-ultra-high impact mesh classes, the acrylic finish coat with its textures and colors, aesthetic reveals and expansion joints, terminations and back-wrapping at edges and openings, sealant and flashing integration, and the inspection, mockup, and water testing that verify the installed wall. Addresses the IBC requirements that govern EIFS — the mandatory water-resistive barrier and drainage, the foam-plastic provisions, and NFPA 285 assembly fire testing where combustible components occur on Type I through IV construction.
− Not intended for: Class PM (polymer-modified) EIFS, hard-coat cement-based stucco systems, and one-coat stucco (which use a thick cementitious lamina over lath and are specified separately); barrier (non-drainage) EIFS, which is not specified for new construction because of its history of moisture-intrusion failure; below-grade and at-grade systems and EIFS terminating into soil; interior insulation finish systems; structural insulated panels; the continuous air barrier and water-resistive barrier where furnished as a separate system behind the EIFS, specified in [[sync/air-barriers]] and referenced — not duplicated — here; the wall thermal insulation within the stud cavity, specified in [[sync/building-thermal-insulation]]; the architectural sheet metal flashing, copings, and trim that meet the EIFS, specified in [[sync/sheet-metal-flashing-and-trim]]; the perimeter and movement-joint sealants, specified in [[sync/joint-sealants]]; and single-family and two-family dwellings governed solely by the IRC.
−---
−
−# Scope {toc}
−
−## This standard covers the materials, design basis, water management, application, sealing, and testing of Class PB exterior insulation and finish systems with drainage that form the visible cladding of the above-grade exterior wall. {note}
−## The work includes the water-resistive barrier and its accessories applied to the sheathing; the drainage means that creates and maintains a drained cavity behind the insulation; the expanded-polystyrene insulation board and the adhesive or mechanical means that attaches it; the glass-fiber-reinforced base coat and its reinforcing mesh, including the impact mesh class; the acrylic finish coat, its texture and color; the aesthetic reveals, joints, and back-wrapped edges; the perimeter and penetration terminations and the interface to flashings, openings, and the air and water control layers behind the system; and the laboratory and field verification that the installed wall drains, sheds water, resists impact, and meets its fire requirements. {note}
−
−## EIFS is not a single product but a proprietary, tested system of matched components, and that is the single most consequential idea in this standard: the water-resistive barrier, the adhesive, the insulation board, the base coat, the mesh, and the finish are designed, tested, and warranted together as one assembly. {note}
−## A base coat from one system over an insulation board from another, or a substituted water-resistive barrier, voids the system's code listing, its drainage and fire test data, and its warranty. {note}
−## For this reason this standard specifies performance and configuration but defers the matched component set to a single manufacturer's listed system. {note}
−
−## The defining distinction in EIFS is between barrier (face-sealed) and water-managed (drainage) systems, and this standard specifies drainage EIFS exclusively. {note}
−## Early barrier EIFS relied entirely on the finish face and its sealed joints to keep all water out, with the insulation adhered directly to the substrate and no path for incidental water to escape. {note}
−## When water inevitably entered at a failed sealant joint, an unflashed window, or a penetration, it was trapped against moisture-sensitive sheathing and wood framing with no way to drain or dry, and the resulting concealed rot — most infamously in residential construction in humid climates in the 1990s — produced widespread litigation and effectively ended barrier EIFS for new work. {note}
−## Modern drainage EIFS accepts that some water will get behind the finish and provides a continuous water-resistive barrier on the sheathing as the true water line of defense, plus a drained cavity that collects incidental water and weeps it back out at the base. {note}
−## This is why drainage EIFS is the only system specified here, and why the water-resistive barrier and the drainage path — not the finish face — are treated as the controlling water-management layers. {note}
−
−## The boundary of work under this standard is the EIFS cladding and its water management, from the face of the finish back to and including the water-resistive barrier on the sheathing and the means of drainage. {note}
−## The exterior sheathing substrate is furnished under the wall framing or rough-carpentry scope and is referenced here for its required properties. {note}
−## The continuous air barrier, where it is a separate system rather than the EIFS water-resistive barrier itself, is covered by [[sync/air-barriers]]; the stud-cavity insulation is covered by [[sync/building-thermal-insulation]]; the sheet metal flashing, coping, and trim that meet the EIFS are covered by [[sync/sheet-metal-flashing-and-trim]]; and the perimeter and movement-joint sealants are covered by [[sync/joint-sealants]]. {note}
−## This standard covers the connection of the EIFS to those adjacent systems. {note}
−
−## All work shall comply with the adopted edition of the International Building Code (IBC), ASTM E2568 and ASTM C1397, and the EIFS manufacturer's published installation requirements for the specific tested system.
−## The water-resistive barrier, the adhesive, the insulation board, the base coat, the mesh, and the finish shall not be mixed across manufacturers.
−
−# Referenced Standards {toc}
−
−## Materials, application, and installation shall comply with the latest adopted editions of the standards and codes listed below.
−## Where the contract documents, the adopted building or energy code, the EIFS manufacturer's published instructions, or a referenced standard conflict, the more stringent requirement governs unless the Engineer of Record directs otherwise in writing. {note}
−## The EIFS manufacturer's listed and tested system configuration — the specific components, thicknesses, drainage means, and the NFPA 285-compliant assembly — is mandatory and is not altered or mixed across systems even where this standard or the drawings would otherwise appear to permit it. {note}
−
−| Standard | Title |
−|----------|-------|
−| IBC | International Building Code — Chapter 14 (Exterior Walls), Section 1407 (exterior insulation and finish systems), Section 1402 (weather protection / water-resistive barrier), and Chapter 26 / Section 2603 (foam plastic insulation) |
−| ASTM E2568 | Standard Specification for PB Exterior Insulation and Finish Systems |
−| ASTM C1397 | Standard Practice for Application of Class PB Exterior Insulation and Finish Systems (EIFS) and EIFS with Drainage |
−| ASTM E2570 / E2570M | Standard Test Methods for Evaluating Water-Resistive Barrier (WRB) Coatings Used under Exterior Insulation and Finish Systems (EIFS) or EIFS with Drainage |
−| ASTM E2273 | Standard Test Method for Determining the Drainage Efficiency of Exterior Insulation and Finish Systems (EIFS) Clad Wall Assemblies |
−| ASTM E2486 / E2486M | Standard Test Method for Impact Resistance of Class PB and PI Exterior Insulation and Finish Systems (EIFS) |
−| ASTM C578 | Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation |
−| ASTM E2430 | Standard Specification for Expanded Polystyrene (EPS) Thermal Insulation Boards for Use in Exterior Insulation and Finish Systems (EIFS) |
−| ASTM C1177 / C1177M | Standard Specification for Glass Mat Gypsum Substrate for Use as Sheathing |
−| ASTM C1396 / C1396M | Standard Specification for Gypsum Board (paper-faced gypsum sheathing, where used) |
−| NFPA 285 | Standard Fire Test Method for Evaluation of Fire Propagation Characteristics of Exterior Non-Load-Bearing Wall Assemblies Containing Combustible Components |
−| ASTM E84 (UL 723) | Standard Test Method for Surface Burning Characteristics of Building Materials (flame-spread / smoke-developed index) |
−| NFPA 268 | Standard Test Method for Determining Ignitibility of Exterior Wall Assemblies Using a Radiant Heat Energy Source |
−| ASTM E119 (UL 263) | Standard Test Methods for Fire Tests of Building Construction and Materials (fire-resistance rating of rated assemblies) |
−| ASTM E283 | Standard Test Method for Determining Rate of Air Leakage Through Exterior Windows, Curtain Walls, and Doors Under a Specified Pressure Difference |
−| ASTM E331 | Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls by Uniform Static Air Pressure Difference |
−| ASTM E330 | Standard Test Method for Structural Performance of Exterior Windows, Doors, Skylights, and Curtain Walls by Uniform Static Air Pressure Difference |
−| ASTM E96 | Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials (perm rating) |
−| AAMA 501.2 | Quality Assurance and Diagnostic Water Leakage Field Check of Installed Storefronts, Curtain Walls, and Sloped Glazing Systems (field nozzle test of fixed, sealed joints) |
−| ASCE 7 | Minimum Design Loads and Associated Criteria for Buildings and Other Structures (components-and-cladding wind pressures) |
−| ICC-ES | ICC Evaluation Service acceptance criteria and evaluation reports for EIFS and EIFS with drainage (code-compliance listing) |
−
−## Materials, application, and installation shall comply with the latest adopted editions of the standards and codes listed for this standard.
−## Where the contract documents, the code, the manufacturer's instructions, or a referenced standard conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.
−## The EIFS manufacturer's listed and tested system configuration — components, thicknesses, drainage means, and the NFPA 285-compliant assembly — shall not be altered or mixed across systems.
−
−# Submittals {toc}
−
−## Action Submittals {toc}
−
−### The system's drainage, fire, and weathertightness performance and its code listing all depend on the specific tested assembly and cannot be evaluated component by component, so the EIFS is reviewed as a single coordinated package identifying one manufacturer's complete, listed, matched system. {note}
−### The action submittals required for the Engineer's review and return before procurement and application are: {note}
−
−- Product data for the complete EIFS, identifying the manufacturer's system by name, the EIFS class (Class PB with drainage), the water-resistive barrier product and its ASTM E2570 evaluation, the drainage means, the insulation board type and the maximum and minimum board thickness, the base coat and adhesive, the reinforcing mesh weights and the impact class, and the finish coat type and texture
−- The current ICC-ES evaluation report (or equivalent code-compliance listing) for the specific system, confirming compliance with IBC Section 1407, ASTM E2568, the required drainage efficiency, and the foam-plastic provisions
−- ASTM E2273 drainage efficiency test data for the system, demonstrating the required minimum drainage efficiency of the clad assembly
−- NFPA 285 compliance evidence for the as-designed wall — a passing NFPA 285 test report for the specific assembly (sheathing, water-resistive barrier, insulation type and thickness, base/finish, and the back-up wall), or an engineering analysis prepared by a qualified fire-protection engineer extending a tested assembly to the proposed configuration within defensible limits
−- Surface-burning (ASTM E84) data for the insulation and the system, and the foam-plastic compliance path under IBC Section 2603
−- ASTM E2486 impact-resistance classification for the specified mesh/base-coat assembly, and a wall diagram or schedule keying each impact class to the wall areas where it is required
−- Shop drawings showing EIFS layout, the location and profile of all aesthetic reveals and expansion joints, every termination and back-wrapped edge, base terminations above grade with weeps, head and sill conditions at openings, inside and outside corners, and the relationship of the EIFS to the water-resistive barrier and air barrier behind it and to the flashings and sealant joints at its perimeter
−- Color and finish samples on the actual base-coat-and-mesh substrate, of sufficient size to evaluate color, texture, and aggregate in natural daylight
−- Manufacturer's installation instructions and the applicator's manufacturer certification
−- A written field water-test (AAMA 501.2) plan where field water testing is specified, identifying the conditions to be tested and the acceptance criteria
−
−### The Contractor shall submit the action submittals listed for this standard for the Engineer's review and return before procurement and application.
−
−```datasheet
−label: Action Submittals Required
−type: checkbox
−options:
− - "Complete EIFS product data (single matched system; WRB, drainage, board, base/mesh, finish)"
− - "ICC-ES evaluation report / code-compliance listing for the specific system (IBC 1407)"
− - "ASTM E2273 drainage efficiency test data"
− - "NFPA 285 test report or engineering judgment for the as-designed assembly"
− - "ASTM E84 surface-burning data and IBC 2603 foam-plastic compliance"
− - "ASTM E2486 impact classification and impact-class wall diagram"
− - "Shop drawings (layout, reveals/joints, terminations, back-wrap, openings, corners, base, WRB/AB interface)"
− - "Color and finish samples on actual base-coat substrate"
− - "Manufacturer installation instructions and applicator certification"
− - "AAMA 501.2 field water-test plan (where field testing is specified)"
−default: "Complete EIFS product data (single matched system; WRB, drainage, board, base/mesh, finish)"
−```
−### The EIFS shall be submitted as a single coordinated package identifying one manufacturer's complete, listed, matched system.
−### Piecemeal submittal of individual components from different manufacturers shall not be acceptable.
−
−## Closeout Submittals {toc}
−
−### At substantial completion, and before the EIFS work is accepted, the Contractor provides the closeout submittals listed below: {note}
−
−- Executed manufacturer system warranty and the executed Contractor installation warranty
−- Field water-test (AAMA 501.2) reports where field testing was performed, recording each condition tested, the result, and the remediation and re-test of any leak
−- Marked-up as-built shop drawings showing actual reveal, expansion-joint, and field-cut conditions and any deviation from the approved details
−- Daily application records, including ambient and substrate temperature and moisture conditions at the time of application of each coat
−- Finish material in the specified color and texture in sealed factory containers for future repair, and Owner attic stock where required by the contract documents
−- Maintenance instructions for cleaning, periodic sealant-joint inspection, and finish repair
−
−### At substantial completion, the Contractor shall provide the closeout submittals listed for this standard before the EIFS work is accepted.
−
−```datasheet
−label: Closeout Submittals Required
−type: checkbox
−options:
− - "Executed manufacturer system warranty and Contractor installation warranty"
− - "AAMA 501.2 field water-test reports (where field testing was performed)"
− - "Marked-up as-built shop drawings (reveals, expansion joints, field-cut conditions, deviations)"
− - "Daily application records (ambient and substrate temperature and moisture per coat)"
− - "Finish material for future repair in sealed factory containers, and Owner attic stock where required"
− - "Maintenance instructions (cleaning, sealant-joint inspection, finish repair)"
−default: "Executed manufacturer system warranty and Contractor installation warranty"
−```
−
−# Quality Assurance {toc}
−
−## Applicator Qualifications {toc}
−
−```datasheet
−label: Applicator Qualification Basis
−type: radio
−options:
− - "Manufacturer-certified applicator for the specific EIFS, with documented comparable experience (standard)"
− - "Manufacturer-certified applicator (certification only)"
−default: "Manufacturer-certified applicator for the specific EIFS, with documented comparable experience (standard)"
−```
−
−### EIFS performance depends almost entirely on field workmanship — the continuity of the water-resistive barrier, the correct base-coat thickness with the mesh fully embedded and not exposed, the back-wrapping of every edge, and the detailing of terminations — and most of this work is concealed by the finish coat and cannot be inspected after the fact. {note}
−### A manufacturer-certified applicator is the single most effective quality measure available before testing. {note}
−### The EIFS applicator shall be certified by the EIFS manufacturer for the specific system.
−### The applicator shall have documented experience applying drainage EIFS of comparable type, scale, and complexity.
−
−## Manufacturer's Field Services {toc}
−
−### Many manufacturer warranties are void without documented field visits, so these visits are both a quality measure and a condition of the system warranty. {note}
−
−### The EIFS manufacturer's technical representative shall observe the mockup, the start of field application, and periodic work thereafter.
−### The manufacturer's representative shall confirm in writing that the application conforms to the requirements on which the system warranty depends.
−### The Contractor shall schedule and coordinate the manufacturer's field visits.
−
−## Pre-Installation Conference {toc}
−
−### The purpose of the conference is to resolve, in advance and on paper, which trade installs each part of every flashing, termination, and sealant joint, in what sequence, and how responsibility for the continuity of the water-resistive barrier and the drainage path is handed off. {note}
−### The overwhelming majority of EIFS failures originate at these trade boundaries and at openings, not in the field of the wall. {note}
−
−### Before EIFS work begins, the Contractor shall convene a pre-installation conference with the Engineer, the EIFS manufacturer's representative, the EIFS applicator, and the installers of every adjacent trade whose work meets the system — sheathing and framing, air barrier, sheet metal flashing, fenestration, and joint sealants.
−### The conference shall resolve which trade installs each part of every flashing, termination, and sealant joint, in what sequence, and how responsibility for the continuity of the water-resistive barrier and drainage path is handed off.
−
−## Mockup {toc}
−
−```datasheet
−label: Mockup Requirement
−type: radio
−options:
− - "Field mockup with WRB, field finish, reveal, expansion joint, corners, back-wrapped edge, base termination, and opening (standard)"
− - "Field mockup of field finish and one opening and one termination only (small projects)"
− - "Mockup not required (minor scope)"
−default: "Field mockup with WRB, field finish, reveal, expansion joint, corners, back-wrapped edge, base termination, and opening (standard)"
−```
−
−### The Contractor shall construct a field mockup of a representative EIFS area incorporating at least one of each critical condition — the water-resistive barrier on the sheathing, a typical field area with the finish texture and color, an aesthetic reveal, an expansion joint, an inside and an outside corner, a back-wrapped edge, a base termination with weeps, and a window or door perimeter with its flashing and sealant joint.
−### The mockup shall be reviewed and accepted by the Engineer and the manufacturer's representative and shall establish the standard of workmanship, color, and texture for the project.
−### Where required, the mockup shall be subjected to a field water test (AAMA 501.2) before approval.
−
−# Environmental and Service Conditions {toc}
−
−## Wind Load {toc}
−
−### Corner and edge zones see substantially higher suction than the wall field and govern the insulation attachment and the sheathing fastening there. {note}
−### For adhesively attached insulation the bond of the adhesive to the water-resistive barrier and the sheathing carries the suction load, and the substrate and water-resistive barrier must be those for which the system's wind-load data was developed; for mechanically attached insulation the fastener pattern is tightened in the corner and edge zones.
−
−```datasheet
−label: Design Wind Pressure — Wall Field (components-and-cladding, ASCE 7)
−type: range
−unit: psf
−drawing_ref: true
−options:
− min: 20
− max: 100
− setpoints: [20, 30, 40, 50, 60, 75, 90, 100]
−default: 40
−```
−
−```datasheet
−label: Design Wind Pressure — Corner/Edge Zone (components-and-cladding, ASCE 7)
−type: range
−unit: psf
−drawing_ref: true
−options:
− min: 30
− max: 150
− setpoints: [30, 45, 60, 75, 90, 120, 150]
−default: 75
−```
−
−### The EIFS, its insulation attachment, and the supporting sheathing and framing shall resist the positive and negative (inward and, more critically, outward suction) components-and-cladding wind pressures determined per ASCE 7 for the building's height, exposure, risk category, and the wall zone.
−### For adhesively attached insulation, the substrate and water-resistive barrier shall be those for which the system's wind-load data was developed.
−### For mechanically attached insulation, the fastener pattern shall be tightened in the corner and edge zones.
−
−## Impact Exposure {toc}
−
−### The EIFS lamina is thin and the insulation behind it is soft, so an EIFS face is far more vulnerable to denting and puncture from foot traffic, carts, vehicles, vandalism, and maintenance equipment than masonry or metal cladding. {note}
−### The industry response is to vary the reinforcing mesh to achieve the ASTM E2486 impact classes, with heavier or multiple-layer mesh in the lower wall and at exposed corners and the standard mesh in unreachable upper areas. {note}
−### Wall areas within reach of the ground or of pedestrian and vehicle traffic are the controlling concern; specifying only standard mesh on a building with an exposed base produces a wall that is damaged before occupancy. {note}
−
−### The base-coat-and-mesh assembly shall be selected for the impact exposure of each wall area.
−
−```datasheet
−label: Base Impact Exposure (governing wall area)
−type: radio
−options:
− - "Standard exposure — upper walls and areas not reachable from grade or traffic"
− - "Elevated exposure — lower walls within ~8 ft of grade, pedestrian areas, exposed corners"
− - "Severe exposure — loading docks, vehicle areas, high-traffic / high-abuse areas"
−default: "Elevated exposure — lower walls within ~8 ft of grade, pedestrian areas, exposed corners"
−```
−### Wall areas within reach of grade or of pedestrian and vehicle traffic shall receive the heavier impact mesh class required for that exposure.
−
−## Substrate and Drainage Above Grade {toc}
−
−### EIFS terminated into the ground wicks ground moisture into the insulation and the substrate and is a recurrent failure mode; the system shall start at a clean, flashed, weeped base above grade.
−
−```datasheet
−label: Minimum EIFS Base Height Above Grade / Horizontal Surface
−type: select
−unit: in
−drawing_ref: true
−options:
− - "6 in above finished grade / paving (typical minimum)"
− - "8 in above finished grade / paving"
− - "Per manufacturer and local code"
−default: "6 in above finished grade / paving (typical minimum)"
−```
−
−### The EIFS shall terminate above the adjacent finished grade or paving with a back-wrapped, drained, weeped base.
−### The EIFS shall not extend into or terminate at or below grade and shall not be in continuous contact with soil, paving, or standing water.
−### The minimum height of the EIFS base above grade and above roofs, decks, and other horizontal surfaces shall be as required by the manufacturer and the contract documents.
−
−# Performance Requirements {toc}
−
−## The EIFS is selected and verified against water management (water-resistive barrier integrity and drainage efficiency), structural (wind) load, impact resistance, thermal performance, and fire performance. {note}
−## With the single exception of the finish texture and color, these are properties of the listed, tested system as an assembly, not of any one component, and the Contractor shall submit the system's evaluation report and test data for the configuration matching the project.
−
−## Water-Resistive Barrier and Drainage {toc}
−
−### Continuous Water-Resistive Barrier {toc}
−
−#### The water-resistive barrier — not the finish face — is the layer that keeps the building dry in a drainage EIFS, and it must be continuous across the entire wall and lapped or sealed shingle-fashion into every flashing so that any water reaching it drains down and out.
−#### The barrier is most commonly a fluid-applied (trowel, roller, or spray) coating that is part of the manufacturer's listed system and that also serves as the adhesive bedding for the insulation, but it may be a sheet membrane where the system is listed for it.
−#### Where the water-resistive barrier also serves as the wall's air barrier, the air-barrier requirements of [[sync/air-barriers]] apply and the two functions are coordinated as one continuous plane. {note}
−
−#### The EIFS shall include a continuous water-resistive barrier applied to the exterior face of the sheathing, evaluated under ASTM E2570, that is the primary water line of defense behind the system.
−
−```datasheet
−label: Water-Resistive Barrier Type
−type: radio
−options:
− - "Fluid-applied WRB (trowel/roller/spray), part of the listed EIFS system (standard for drainage EIFS)"
− - "Self-adhered sheet membrane WRB, where the system is listed for it"
− - "Building wrap / mechanically-fastened sheet WRB, where the system is listed for it"
−default: "Fluid-applied WRB (trowel/roller/spray), part of the listed EIFS system (standard for drainage EIFS)"
−```
−#### The water-resistive barrier shall be made continuous and integrated with the flashings at all openings, penetrations, and terminations so that any water reaching it drains down and out.
−#### Where the water-resistive barrier also serves as the wall's air barrier, the air-barrier requirements of [[sync/air-barriers]] shall apply and the two functions shall be coordinated as one continuous plane.
−
−```datasheet
−label: WRB Also Serves as Air Barrier
−type: radio
−options:
− - "Yes — WRB is the continuous air barrier; coordinate per [[sync/air-barriers]] (standard)"
− - "No — a separate air barrier is provided per [[sync/air-barriers]]"
−default: "Yes — WRB is the continuous air barrier; coordinate per [[sync/air-barriers]] (standard)"
−```
−
−### Drainage Cavity and Efficiency {toc}
−
−#### Drainage is the feature that distinguishes a modern code-compliant EIFS from the failed barrier systems of the past, and ASTM E2273 is the test that proves it: a 90% drainage efficiency means the assembly drains at least 90% of the water introduced into the cavity, confirming that incidental water has a path out rather than a place to accumulate. {note}
−#### The 90% threshold is the IBC and ASTM E2568 minimum for EIFS with drainage and is not reduced. {note}
−
−#### The system shall provide a continuous drainage means behind the insulation — a grooved board, a drainage mat, an adhesive ribbon pattern, or other listed means — that collects incidental water at the water-resistive barrier and drains it to weeps at the base.
−
−```datasheet
−label: Drainage Means
−type: radio
−options:
− - "Grooved (vertically channeled) insulation board (standard)"
− - "Drainage mat / entangled-net drainage layer behind the insulation"
− - "Adhesive applied in vertical ribbons creating drainage channels (per listed system)"
− - "Per manufacturer's listed drainage system"
−default: "Grooved (vertically channeled) insulation board (standard)"
−```
−#### The drainage means shall be continuous and unobstructed from the field of the wall down to weeps at every base and horizontal termination, and shall not be bridged by adhesive, base coat, or sealant that would dam the cavity.
−#### The clad assembly shall demonstrate a drainage efficiency of not less than 90% when tested per ASTM E2273, and this threshold shall not be reduced.
−
−```datasheet
−label: Minimum Drainage Efficiency (ASTM E2273)
−type: range
−unit: '%'
−options:
− min: 90
− max: 100
− setpoints: [90, 95, 100]
−default: 90
−```
−
−## Structural Performance Under Wind Load {toc}
−
−### The EIFS lamina carries little load itself; the wind resistance of the wall is governed by the bond or fastening of the insulation to the substrate and by the capacity of the sheathing and framing behind it. {note}
−### The system's listed wind-load value is developed for a specific substrate and attachment method, and the as-built substrate, water-resistive barrier, and attachment must match the tested configuration.
−
−### The EIFS, its insulation attachment, and the supporting sheathing and framing shall sustain the design positive and negative wind pressures without insulation disengagement, sheathing failure, or cracking of the lamina, verified by the system's wind-load evaluation (ASTM E330 where applicable) within the listed substrate and attachment limits.
−### The as-built substrate, water-resistive barrier, and attachment shall match the system's tested wind-load configuration.
−### Where adhesive attachment is used, the substrate shall be one to which the adhesive achieves the listed bond.
−
−## Thermal Performance {toc}
−
−### A principal advantage of EIFS is that the EPS is continuous exterior insulation outboard of the framing, so it is not interrupted by studs and largely eliminates the thermal bridging that plagues cavity-insulated metal-framed walls. {note}
−### The EPS contributes a nominal thermal resistance of approximately R-3.6 to R-4.0 per inch (ASTM C578 Type I), and the assembly U-factor is the continuous EPS plus any cavity insulation behind the sheathing, with only the minor bridging of the insulation fasteners (where mechanically attached) to deduct. {note}
−
−### The opaque EIFS wall assembly shall meet the assembly U-factor (or continuous-insulation R-value) required by the adopted energy code for the climate zone, taking credit for the continuous exterior EPS insulation.
−
−```datasheet
−label: Required Assembly U-Factor
−type: range
−unit: Btu/h·ft²·°F
−drawing_ref: true
−options:
− min: 0.03
− max: 0.12
− setpoints: [0.03, 0.045, 0.055, 0.064, 0.084, 0.12]
−default: 0.064
−```
−### The insulation thickness shall be set to meet the assembly U-factor for the climate zone.
−
−## Fire Performance and NFPA 285 {toc}
−
−### Fire performance is the most code-critical requirement in this standard because EPS is a foam-plastic insulation and is combustible, so essentially every EIFS wall contains a combustible component and is governed by the foam-plastic and fire-propagation provisions of the IBC. {note}
−### The design shall confirm the fire-compliance path before the system is selected.
−
−### NFPA 285 Trigger and Compliance {toc}
−
−#### NFPA 285 is a full-scale fire-propagation test of a complete wall assembly that evaluates whether fire spreads vertically up the exterior face and through the wall beyond acceptable limits. {note}
−#### It is mandated for foam-plastic-containing walls because the EPS, while an excellent insulator, will burn and can carry flame up a multi-story facade if the assembly is not detailed to interrupt that spread. {note}
−#### Compliance is a property of the entire assembly as tested — the specific sheathing, water-resistive barrier, EPS type and thickness, base and finish, and the back-up wall — and substituting any combustible component or exceeding the tested EPS thickness invalidates it. {note}
−
−#### Where the exterior wall assembly of a building of Type I, II, III, or IV construction contains the combustible EPS insulation of an EIFS (IBC Section 2603), the assembly shall be tested in accordance with, and comply with the acceptance criteria of, NFPA 285.
−
−```datasheet
−label: NFPA 285 Compliance Requirement
−type: radio
−options:
− - "Required — combustible EPS on Type I-IV construction; passing NFPA 285 test of the as-built assembly (standard)"
− - "Required — compliance by fire-protection engineer's engineering judgment extending a tested assembly"
− - "Not triggered — Type V construction within the height/area limits permitting foam plastic without NFPA 285"
−default: "Required — combustible EPS on Type I-IV construction; passing NFPA 285 test of the as-built assembly (standard)"
−```
−#### Where the project assembly does not exactly match a tested assembly, compliance may be demonstrated by a fire-protection engineer's engineering analysis that extends a passing test within defensible limits.
−#### The Contractor shall not apply an EIFS on Type I-IV construction without documented NFPA 285 compliance for the as-built assembly.
−
−### Surface Burning and Foam-Plastic Provisions {toc}
−
−#### The Class A surface-burning limit (flame-spread not more than 25, smoke-developed not more than 450) is the baseline foam-plastic requirement, and the IBC Section 2603 provisions — including the thermal-barrier separation from the interior and the special approval that EIFS obtains through its full-scale fire testing — apply in addition to it. {note}
−#### The thermal barrier between the wall interior and the foam plastic (typically the interior gypsum board) is a required code element, not an option. {note}
−
−#### The EPS insulation and the EIFS shall meet a flame-spread index of not more than 25 and a smoke-developed index of not more than 450 when tested per ASTM E84.
−
−```datasheet
−label: Surface Burning Limit (ASTM E84)
−type: radio
−options:
− - "Flame-spread ≤ 25 and smoke-developed ≤ 450 (Class A; required for foam plastic per IBC 2603)"
−default: "Flame-spread ≤ 25 and smoke-developed ≤ 450 (Class A; required for foam plastic per IBC 2603)"
−```
−#### The foam-plastic insulation shall comply with the applicable provisions of IBC Section 2603, including the required thermal-barrier separation from the interior.
−
−# Substrate {toc}
−
−## Exterior Sheathing {toc}
−
−### The sheathing is the substrate the water-resistive barrier and the insulation attach to, and its moisture resistance is the last line of defense if the water-resistive barrier is breached. {note}
−### Glass-mat gypsum sheathing (ASTM C1177) is the standard substrate for EIFS on steel- and wood-framed walls because its glass-mat facing and treated core resist moisture far better than the paper face of ordinary gypsum sheathing, which feeds mold and loses strength when wet. {note}
−### Paper-faced gypsum sheathing (ASTM C1396), exterior-grade wood structural panels, and concrete and masonry are also valid substrates for systems listed over them. {note}
−
−### The exterior sheathing receiving the EIFS shall be a substrate to which the manufacturer's listed system is applicable, and shall be sound, dry, flat within the manufacturer's tolerance, and securely fastened to the framing.
−
−```datasheet
−label: Exterior Sheathing Substrate
−type: radio
−options:
− - "Glass-mat gypsum sheathing — ASTM C1177 (standard for framed walls)"
− - "Paper-faced gypsum sheathing — ASTM C1396 (where the system is listed over it)"
− - "Exterior wood structural panel (plywood / OSB), where listed"
− - "Concrete or unit masonry, where listed (often without separate drainage cavity)"
−default: "Glass-mat gypsum sheathing — ASTM C1177 (standard for framed walls)"
−```
−### The substrate shall be the one for which the system's wind-load, drainage, and fire data were developed.
−
−# Insulation Board {toc}
−
−## EPS Board Type and Aging {toc}
−
−### The EIFS insulation board is a low-density EPS specifically manufactured and aged for EIFS, not generic foam. {note}
−### ASTM E2430 governs the EPS for EIFS — its density, dimensional stability, flame spread, and the required aging — because fresh EPS taken too soon from the mold continues to shrink and will not stay flat or bonded once installed. {note}
−
−### The insulation board shall be expanded polystyrene (EPS) conforming to ASTM E2430 and the applicable type of ASTM C578 (nominal Type I, approximately 1.0 pcf density), manufactured for EIFS use.
−### The board shall be aged not less than the period required by ASTM E2430 (commonly several weeks) before it is cut and installed, so it is dimensionally stable.
−
−```datasheet
−label: EPS Aging Before Installation
−type: radio
−options:
− - "Aged per ASTM E2430 minimum (standard) — board dimensionally stable before installation"
− - "Per manufacturer's stated minimum aging period"
−default: "Aged per ASTM E2430 minimum (standard) — board dimensionally stable before installation"
−```
−### The board shall be cut square, flat, and to the required thickness.
−### Damaged or warped boards shall not be used.
−
−## EPS Board Thickness {toc}
−
−### Board thickness is governed at the low end by the manufacturer's minimum (typically 3/4 in, below which back-wrapping and fastening are impractical) and at the high end by the NFPA 285-tested assembly limit, because the EPS thickness directly affects the fuel load in the fire test — a thicker board than was tested invalidates the fire compliance. {note}
−
−### The EPS board thickness shall be as required to meet the assembly thermal requirement.
−
−```datasheet
−label: EPS Board Thickness
−type: select
−unit: in
−drawing_ref: true
−options:
− - "1 in"
− - "1.5 in"
− - "2 in"
− - "2.5 in"
− - "3 in"
− - "4 in (verify against the system's NFPA 285-tested maximum)"
−default: "2 in"
−```
−### The EPS board thickness shall be not less than the manufacturer's minimum.
−### The EPS board thickness shall not exceed the maximum thickness of the system's NFPA 285-tested and listed assembly.
−
−## Insulation Attachment {toc}
−
−### Adhesive attachment is the standard for drainage EIFS over gypsum and similar sheathings, with the adhesive applied in a ribbon or notched pattern that both bonds the board and forms the vertical drainage channels of the cavity; the bond develops to the water-resistive barrier, so the barrier and substrate must be those the system is listed and load-tested over.
−### Mechanical fasteners with washers are used where adhesive bond is not achievable or where the system is listed for them, but each fastener penetrates the water-resistive barrier and must be sealed or located per the listing.
−### Board joints aligned with substrate joints or opening corners telegraph cracks through the finish. {note}
−
−### The EPS board shall be attached to the substrate by the manufacturer's listed means — adhesive bedded to the water-resistive barrier, mechanical fasteners, or a combination — sufficient to resist the design wind pressures.
−
−```datasheet
−label: Insulation Attachment Method
−type: radio
−options:
− - "Adhesive (ribbon/notched) bedded to the WRB, forming drainage channels (standard for drainage EIFS)"
− - "Mechanical fasteners with washers (where listed or where adhesive bond is not achievable)"
− - "Combination adhesive and mechanical (high wind / specific listed systems)"
−default: "Adhesive (ribbon/notched) bedded to the WRB, forming drainage channels (standard for drainage EIFS)"
−```
−### The attachment shall not bridge or obstruct the drainage cavity.
−### Where mechanical fasteners penetrate the water-resistive barrier, they shall be sealed or located per the system listing.
−### Boards shall be installed in a running-bond pattern with tight joints, offset from sheathing joints and from the corners of openings.
−
−# Base Coat and Reinforcing Mesh {toc}
−
−## Base Coat {toc}
−
−### The base coat is the structural skin of the EIFS: it carries the reinforcing mesh, distributes impact and stress, and forms the substrate for the finish. {note}
−### The governing workmanship requirement is full embedment of the mesh — the mesh must be troweled into wet base coat and covered so that its color and weave do not show through, because exposed or near-surface mesh is a crack and a moisture path and is the most common base-coat defect.
−### The base coat thickness and the wet-on-wet or two-pass application follow the manufacturer's instructions for the mesh weight used. {note}
−
−### The base coat shall be the manufacturer's polymer-based or polymer-modified cementitious base coat, applied over the insulation in the thickness required to fully embed the reinforcing mesh.
−### No mesh color or pattern shall be visible through the cured base coat.
−### The base coat thickness and the wet-on-wet or two-pass application shall follow the manufacturer's instructions for the mesh weight used.
−
−## Reinforcing Mesh and Impact Class {toc}
−
−### The impact resistance of an EIFS is set by the reinforcing mesh, and ASTM E2486 defines four classes achieved by heavier or multiple-layer mesh: Standard (25 to 49 in-lbf), Medium (50 to 89 in-lbf), High (90 to 150 in-lbf), and Ultra High (151 in-lbf and greater). {note}
−### Standard impact mesh (roughly 4 to 6 oz/yd²) is used on upper walls out of reach; a heavier high-impact mesh (on the order of 15 oz/yd²) or a layered assembly is used in the lower wall and at exposed corners; and ultra-high mesh (on the order of 20 oz/yd²) or doubled mesh is used at loading docks, vehicle areas, and high-abuse locations. {note}
−### The alkalinity of the base coat degrades uncoated glass over time, so the mesh must be alkali-resistant coated.
−
−```datasheet
−label: Field Impact Classification (ASTM E2486)
−type: radio
−options:
− - "Standard — 25 to 49 in-lbf (upper walls, not reachable from grade or traffic)"
− - "Medium — 50 to 89 in-lbf (moderate exposure)"
− - "High — 90 to 150 in-lbf (lower walls within ~8 ft of grade, pedestrian areas, exposed corners)"
− - "Ultra High — 151 in-lbf and greater (loading docks, vehicle areas, high-abuse)"
−default: "Standard — 25 to 49 in-lbf (upper walls, not reachable from grade or traffic)"
−```
−
−```datasheet
−label: High-Impact Mesh at Lower Wall / Exposed Areas
−type: radio
−options:
− - "High-impact mesh (or layered mesh) to ~8 ft above grade and at exposed corners (recommended)"
− - "Ultra-high-impact mesh at high-abuse and vehicle-exposed areas"
− - "Standard mesh throughout (only where no impact exposure exists)"
−default: "High-impact mesh (or layered mesh) to ~8 ft above grade and at exposed corners (recommended)"
−```
−
−### The reinforcing mesh shall be the manufacturer's alkali-resistant (coated) glass-fiber mesh, of the weight and number of layers required to achieve the specified ASTM E2486 impact classification for each wall area.
−### Where two impact classes meet, the heavier mesh shall be lapped behind the lighter at the transition so there is no unreinforced gap.
−### The glass-fiber mesh shall be alkali-resistant coated.
−
−# Finish Coat {toc}
−
−## Finish Type and Texture {toc}
−
−### The finish coat is the weathering and aesthetic face of the EIFS and is, in modern Class PB systems, a 100% acrylic polymer finish that is integrally colored (so chips do not show a different color beneath), flexible enough to bridge the hairline movement of the lamina, and available in a wide range of factory textures. {note}
−### Acrylic finishes resist dirt, fading, and mildew better than the older cementitious finishes and are the standard. {note}
−### The texture and color are selected from the manufacturer's range and confirmed on the mockup; deep, coarse textures hide minor base-coat irregularity but collect more dirt, while fine and smooth textures show every substrate imperfection and demand a flatter base coat. {note}
−
−### The finish coat shall be the manufacturer's factory-mixed, ready-to-use acrylic (100% acrylic polymer) finish, integrally colored, applied over the cured base coat in the specified texture and color.
−
−```datasheet
−label: Finish Coat Type
−type: radio
−options:
− - "100% acrylic finish, integrally colored (standard for Class PB EIFS)"
− - "Acrylic finish with enhanced dirt-pickup-resistance / mildew-resistant additive"
− - "Elastomeric / high-flexibility acrylic finish (where greater crack-bridging is required)"
−default: "100% acrylic finish, integrally colored (standard for Class PB EIFS)"
−```
−### The texture and color shall be selected from the manufacturer's range and confirmed on the mockup.
−
−```datasheet
−label: Finish Texture
−type: select
−drawing_ref: "finish schedule"
−options:
− - "Fine / sand texture"
− - "Medium aggregate texture"
− - "Coarse aggregate texture"
− - "Troweled / smooth texture"
−default: "Medium aggregate texture"
−```
−
−```datasheet
−label: Finish Color
−type: text
−drawing_ref: "finish schedule"
−default: deferred
−```
−
−## Color Limitations {toc}
−
−### Very dark colors on an EPS-based EIFS are a real constraint, not a preference: dark finishes absorb solar heat and can drive the EPS surface temperature toward its softening range, causing distortion and bond loss. {note}
−
−### The finish color shall have a light reflectance value not less than the manufacturer's minimum for EPS-based EIFS unless the system is specifically listed for dark colors.
−
−```datasheet
−label: Finish Light Reflectance Value (LRV)
−type: radio
−options:
− - "At or above the manufacturer's minimum LRV for standard EPS EIFS (standard)"
− - "Below standard minimum — use only a system specifically listed for dark colors"
−default: "At or above the manufacturer's minimum LRV for standard EPS EIFS (standard)"
−```
−### Where a dark color below the standard minimum LRV is required, a finish and EPS specifically listed for low-LRV use shall be specified.
−
−# Joints, Reveals, and Terminations {toc}
−
−## Aesthetic Reveals {toc}
−
−### Reveals are decorative grooves routed or cut into the EPS to articulate the facade. {note}
−### The sides and bottom of a reveal are wall surface, not a free edge, and the insulation left at the bottom of the groove must stay thick enough that the reveal does not become a thin, crack-prone, or moisture-trapping line.
−### Reveal locations and profiles shall be [[drawing: as shown on the elevations and reveal details]].
−
−### Aesthetic reveals (decorative grooves) shall be formed in the insulation and fully back-wrapped.
−### Reveals shall be reinforced with base coat and mesh on all faces of the groove, base-coated, meshed, and finished exactly like the field, and never left as bare foam.
−### Reveals shall not reduce the insulation below the system's minimum thickness at the bottom of the reveal.
−### Reveals are not expansion joints and shall not be relied upon to accommodate building movement.
−
−## Expansion and Movement Joints {toc}
−
−### An EIFS expansion joint is a true break through the entire system down to the substrate, sealed with a backer rod and sealant, that lets the building and the cladding move without cracking the lamina. {note}
−### Joints are mandatory where the structure itself moves (structural expansion and seismic joints), where the substrate changes (because two substrates move differently), and at the floor lines of platform-framed wood construction (which shrinks across the floor framing). {note}
−### Expansion-joint locations shall be [[drawing: as shown on the elevations and expansion-joint details]].
−
−```datasheet
−label: Expansion Joint Locations Required
−type: checkbox
−options:
− - "At structural expansion and seismic joints (full assembly break)"
− - "Where dissimilar substrates meet"
− - "At floor lines of wood-framed / platform construction"
− - "At changes in building height or structural support"
− - "At the maximum panel dimensions required by the manufacturer"
−default: "At structural expansion and seismic joints (full assembly break)"
−```
−
−### Expansion joints shall be provided through the full EIFS, including the insulation, where the building structure has an expansion or seismic joint, where dissimilar substrates meet, at floor lines of wood-framed and other moving construction, and at the limits required by the manufacturer.
−### Each EIFS edge at an expansion joint shall be back-wrapped so no bare foam is exposed in the joint.
−### The sealant in the joint is specified in [[sync/joint-sealants]] and shall be one the EIFS manufacturer approves for adhesion to the finish.
−
−## Back-Wrapping of Terminations {toc}
−
−### Back-wrapping is the most important detail in EIFS workmanship and the one most often skipped. {note}
−### A bare, un-back-wrapped EPS edge is an open path for water to enter the insulation and the cavity from the side, bypassing the finish face entirely, and it is mechanically fragile. {note}
−### The mesh is turned around the edge of the foam and bonded back to the substrate or the water-resistive barrier before the field mesh laps over it, so the lamina is continuous around the edge and the foam is fully encapsulated. {note}
−
−### All EIFS edges — at terminations, openings, expansion joints, reveals, and any place the EIFS stops — shall be back-wrapped: the reinforcing mesh and base coat shall be wrapped around the edge of the insulation and onto the substrate so that no bare EPS edge is exposed.
−
−```datasheet
−label: Edge Back-Wrapping
−type: radio
−options:
− - "All EIFS edges fully back-wrapped (mesh and base coat wrapped onto substrate) — mandatory (standard)"
−default: "All EIFS edges fully back-wrapped (mesh and base coat wrapped onto substrate) — mandatory (standard)"
−```
−### Each edge shall be back-wrapped before the field mesh laps over it, so the lamina is continuous around the edge and the foam is fully encapsulated.
−
−## Base Termination and Weeps {toc}
−
−### The base of the EIFS is where the drainage cavity discharges, and it shall be detailed with a starter or drainage track (or equivalent weep means) that holds the bottom edge, supports the back-wrap, and lets cavity water weep out without being dammed by base coat or sealant.
−### The base detail shall be [[drawing: as shown on the base termination detail]].
−
−```datasheet
−label: Base Termination
−type: radio
−options:
− - "Manufacturer's drainage / starter track with weeps and back-wrapped edge (standard for drainage EIFS)"
− - "Back-wrapped edge over flashing with open weep at base"
−default: "Manufacturer's drainage / starter track with weeps and back-wrapped edge (standard for drainage EIFS)"
−```
−
−### The EIFS shall terminate at its base with a back-wrapped edge and a drainage track or weep means that drains the cavity to the exterior, located the required height above grade or the adjacent horizontal surface.
−### The base drainage track or weep means shall not be dammed by base coat or sealant.
−
−# Flashing and Sealant Integration {toc}
−
−## Flashing at Openings and Terminations {toc}
−
−### The flashings that frame the EIFS are where the system hands off to the rest of the envelope, and they are the most failure-prone part of the installation. {note}
−### Head flashings turn up behind the water-resistive barrier and discharge over and beyond the finish; sill and base flashings are pan-formed with end dams to collect and expel water; and copings shed water away from the EIFS rather than onto or behind it. {note}
−### The sheet metal flashing itself is specified in [[sync/sheet-metal-flashing-and-trim]]; this standard requires that the EIFS-to-flashing interface preserve the continuity of the water-resistive barrier and drain to the exterior. {note}
−### Flashings shall be [[drawing: as shown on the head, sill, jamb, base, parapet, and penetration details]].
−
−### Flashings at the head and sill of openings, at horizontal terminations, at parapets and copings, and at penetrations shall be integrated with the water-resistive barrier and shall divert water to the exterior in front of or onto the EIFS drainage plane.
−### Sill flashings shall be pan-formed and provided with end dams.
−### EIFS shall never be relied upon to seal a condition that should be flashed behind it.
−### The EIFS-to-flashing interface shall preserve the continuity of the water-resistive barrier and drain to the exterior.
−
−## Sealant Joints {toc}
−
−### Where sealant is part of the water management — at window and door perimeters, at penetrations, and at expansion joints — its adhesion and movement capability govern its life. {note}
−### Sealant is applied to the base coat over a back-wrapped edge, never to bare EPS or to the finish coat alone, because it will not hold to foam and the finish coat can delaminate under sealant stress; this requires that the EIFS edge be back-wrapped and base-coated before the sealant trade arrives. {note}
−### A rigid bead across a moving joint will tear, so movement joints are sized with a backer rod and a properly proportioned hourglass bead. {note}
−### The perimeter and movement-joint sealants are specified in [[sync/joint-sealants]] and coordinated here. {note}
−
−### Sealant joints at EIFS perimeters, at openings, at expansion joints, and at penetrations shall be installed over a back-wrapped EIFS edge, onto the base coat (not the finish coat alone or bare foam), with a backer rod and the correct joint geometry.
−
−```datasheet
−label: Sealant Substrate at EIFS Joints
−type: radio
−options:
− - "Sealant to base coat over a back-wrapped edge, with backer rod (mandatory; submit adhesion data)"
− - "Not applicable — joint has no sealant in contact with the EIFS"
−default: "Sealant to base coat over a back-wrapped edge, with backer rod (mandatory; submit adhesion data)"
−```
−### The sealant shall be one the EIFS manufacturer approves for adhesion to the system, and the manufacturer's approval of the specific sealant and any required primer shall be obtained.
−### The EIFS edge shall be back-wrapped and base-coated before the sealant trade arrives.
−
−# Testing {toc}
−
−## Field Water Testing {toc}
−
−### Field water testing catches the installation defects — missed back-wraps, omitted end dams, unsealed flashing laps, and sealant failures — that no laboratory test of the listed system can. {note}
−### AAMA 501.2 directs a calibrated water spray along fixed, permanently sealed joints (not at drained, weeped base conditions, which are designed to admit and drain water) to confirm the sealed joints and flashings hold. {note}
−### The test is performed early enough that defects can be corrected, and on a representative sample of the most failure-prone conditions, which for EIFS are the window and door perimeters and the terminations. {note}
−
−### Where specified, the installed EIFS shall be field-tested for water penetration at representative openings, terminations, and sealant joints using the AAMA 501.2 nozzle method on fixed, sealed joints.
−
−```datasheet
−label: Field Water Test (AAMA 501.2)
−type: radio
−options:
− - "Required at representative openings, terminations, and joints; repair and re-test until passing (recommended)"
− - "Required at a defined sample of conditions; report results"
− - "Not required"
−default: "Required at representative openings, terminations, and joints; repair and re-test until passing (recommended)"
−```
−### Any leakage shall be located, repaired, and re-tested.
−
−## Moisture Survey at Substantial Completion {toc}
−
−### Because the EIFS conceals the substrate, an elevated-moisture reading is the only early warning of a flashing or back-wrap defect, and finding it before occupancy is far cheaper than finding the resulting rot years later. {note}
−
−### Where specified, the Contractor shall perform a non-destructive moisture survey of the EIFS at substantial completion to confirm the substrate behind the system is dry and that no concealed water entry has occurred during construction.
−
−```datasheet
−label: Moisture Survey at Completion
−type: radio
−options:
− - "Required — non-destructive moisture survey of the EIFS at substantial completion"
− - "Not required"
−default: "Not required"
−```
−
−# Installation {toc}
−
−## The Contractor shall apply the EIFS in accordance with this standard, the approved shop drawings, ASTM C1397, the manufacturer's listed-system instructions, and the NFPA 285-compliant assembly configuration.
−## Where these conflict, the more stringent shall govern.
−## No component shall be substituted across systems and the tested EPS thickness shall not be exceeded.
−
−## Substrate and Water-Resistive Barrier Verification {toc}
−
−### Once the insulation and lamina are on, the water-resistive barrier behind them cannot be reached without removing the EIFS; the inspection regime is therefore front-loaded, and the completed water-resistive barrier is a hold point. {note}
−### The barrier and its air-barrier function, where combined, are inspected and accepted per [[sync/air-barriers]] before cover-up. {note}
−
−### Before insulation is applied, the Contractor shall verify that the sheathing is sound, dry, flat, and securely fastened, that the water-resistive barrier and its accessory flashings are complete, continuous, inspected, and accepted, and that all rough-opening and penetration flashings behind the system are installed.
−### The applicator shall not cover an incomplete or unaccepted water-resistive barrier.
−
−## Ambient Conditions {toc}
−
−### The water-resistive barrier, adhesive, base coat, and finish are water-based and will not cure correctly below their minimum application temperature, and they shall be protected from freezing during cure.
−
−```datasheet
−label: Minimum Application / Cure Temperature
−type: range
−unit: °F
−options:
− min: 35
− max: 50
− setpoints: [35, 40, 45, 50]
−default: 40
−```
−
−### EIFS materials shall be applied only within the ambient and substrate temperature and moisture range specified by the manufacturer, generally not below 40°F.
−### The work and the materials shall be protected from freezing and from rain until cured.
−### Each coat shall be allowed to cure the required time before the next is applied.
−### Freshly applied materials shall be protected from rain that would wash them out before they set.
−
−## Sequence and Coordination {toc}
−
−### The Contractor shall apply the system in the sequence established at the pre-installation conference, coordinated with the flashing, fenestration, and sealant trades, so that flashings and rough-opening seals that must precede the EIFS are in place, the back-wrapped edges and base coat are ready before the sealant trade arrives, and the drainage path is continuous and unobstructed to the weeps.
−
−## Repair of Damage {toc}
−
−### EIFS is repairable, and a proper repair restores the full layered assembly: where the foam is damaged it shall be cut out and replaced, not just skimmed over, and the mesh and base coat shall lap onto sound surrounding material so the repair is continuous with the wall.
−### A skim-coat patch over crushed foam re-cracks and is not acceptable. {note}
−### Finish texture and color are matched, recognizing that a field repair will weather differently and may remain faintly visible.
−
−### Damage to the cured EIFS — punctures, cracks, gouges, and impact damage — shall be repaired with the manufacturer's materials and method, cutting back to sound material, replacing insulation where the foam is damaged, and re-laminating with mesh and base coat lapped onto sound surrounding lamina before refinishing to match.
−### Where the foam is damaged it shall be cut out and replaced, not skimmed over; a skim-coat patch over crushed foam shall not be acceptable.
−
−# Delivery, Storage, and Handling {toc}
−
−## The water-based coatings, adhesives, base coats, and finishes are freeze-sensitive and shelf-life-limited. {note}
−## EPS boards are degraded by prolonged UV, which attacks the foam surface and the bond. {note}
−## Finish materials of the same color are box-mixed (intermixed) to avoid visible color banding between containers on the wall. {note}
−
−## EIFS materials shall be delivered in the manufacturer's original, sealed, labeled containers and shall be stored off the ground, under cover, and within the temperature range the manufacturer specifies.
−## Material that has frozen or is past its shelf life shall be discarded, not used.
−## EPS boards shall be stored flat, protected from sunlight, and protected from wind and physical damage.
−## Finish materials of the same color shall be from the same batch where possible, and batches shall be box-mixed (intermixed) to avoid visible color banding between containers on the wall.
−
−# Warranty {toc}
−
−```datasheet
−label: Contractor Installation Warranty Period
−type: select
−unit: years
−options:
− - "2 years"
− - "5 years"
−default: "2 years"
−```
−
−```datasheet
−label: Manufacturer System Warranty
−type: select
−unit: years
−options:
− - "5 years"
− - "10 years"
− - "Per manufacturer's standard system warranty"
−default: "Per manufacturer's standard system warranty"
−```
−
−## The manufacturer's system warranty depends on the use of a certified applicator, the complete matched component set, and the documented manufacturer field visits; the Contractor shall satisfy all of these so the warranty is valid.
−## Any leak attributable to a defective termination, back-wrap, flashing interface, or sealant joint, and any moisture damage to the substrate attributable to water entry through the installed system, is corrected at the Contractor's expense. {note}
−
−## The Contractor shall warrant the EIFS installation against leaks, delamination, cracking attributable to workmanship, and defects in workmanship for a period of not less than two years from substantial completion, or for the period stated in the contract documents if longer.
−## The Contractor shall provide the EIFS manufacturer's standard system warranty covering the matched components for the period the manufacturer offers, contingent on the certified applicator, the matched component set, and the documented field services.
−## Any leak attributable to a defective termination, back-wrap, flashing interface, or sealant joint, and any moisture damage to the substrate from water entry through the installed system, shall be corrected at the Contractor's expense.
−
−# Spare Materials (Attic Stock) {toc}
−
−## A custom color may be unavailable later or may not match a later batch, so attic stock of the installed finish and a record of its batch numbers allow future damage to be repaired with matching material.
−
−```datasheet
−label: Attic Stock (Finish Material)
−type: select
−options:
− - "Finish material in each color and texture, quantity per contract documents"
− - "One sealed container of each color and texture"
− - "Not required"
−default: "Finish material in each color and texture, quantity per contract documents"
−```
−
−## The Contractor shall deliver to the Owner, where required by the contract documents, attic stock of finish material in each specified color and texture in sealed factory containers, so that future damage can be repaired with matching material.
−## The batch numbers of the installed finish shall be recorded and provided so future material can be matched as closely as possible.
+---
+title: Exterior Insulation and Finish Systems (EIFS)
+category: Building Envelope
+description: >
+ When to use: Class PB exterior insulation and finish systems installed as the above-grade exterior wall cladding of commercial, institutional, and multifamily buildings. Covers the full layered assembly and both water management classes the building code recognizes: EIFS with drainage, in which a water-resistive barrier on the sheathing and a drained cavity behind the insulation manage incidental water, and barrier EIFS, in which the insulation is adhered directly to the substrate and the finish face carries the water management. Addresses the sheathing substrate the system is applied over, the water-resistive barrier and its relationship to the wall air barrier, the drainage means and drainage efficiency, the expanded polystyrene insulation board and its adhesive or mechanical attachment, the reinforced base coat and the reinforcing mesh impact classes, the finish coat with its type, texture, color, and light reflectance limits, aesthetic reveals, expansion joints, back-wrapping and terminations, the interfaces to flashing and joint sealants, wind load and thermal performance, the surface burning and exterior wall flame propagation requirements that govern a combustible foam plastic cladding, and the mockup, inspection, water testing, and moisture survey that verify the installed wall.
+ Not intended for: Class PM and Class PI systems, hard-coat portland cement plaster, and one-coat stucco, which use a thick cementitious lamina over lath and are specified in [[sync/plaster-and-stucco]]; interior insulation and finish systems; structural insulated panels; below-grade and at-grade insulated wall systems; the continuous air barrier where furnished as a system separate from the EIFS water-resistive barrier, specified in [[sync/air-barriers]]; the stud cavity and continuous insulation of the wall assembly generally, specified in [[sync/building-thermal-insulation]]; the sheet metal flashing, copings, and trim that meet the EIFS, specified in [[sync/sheet-metal-flashing-and-trim]] and [[sync/through-wall-flashing]]; the perimeter and movement joint sealants, specified in [[sync/joint-sealants]] and [[sync/exterior-weather-sealants]]; the windows, doors, and curtain walls the EIFS terminates against, specified in [[sync/glazing]], [[sync/glazed-curtain-walls]], and [[sync/aluminum-entrances-and-storefronts]]; and one- and two-family dwellings governed solely by the residential code.
+---
+
+# Scope {toc}
+
+## This standard covers the materials, water management, attachment, application, sealing, and field verification of Class PB exterior insulation and finish systems that form the visible cladding of the above-grade exterior wall. {note}
+
+## An EIFS is a layered assembly rather than a single product. Working outward from the sheathing it comprises a water-resistive barrier, the adhesive or fasteners that hold the insulation, an expanded polystyrene insulation board, a glass fiber mesh embedded in a reinforcing base coat, and a finish coat, together with the back-wrapped edges, reveals, joints, terminations, and flashing interfaces that close the assembly where it stops. {note}
+
+## Those components are designed, tested, listed, and warranted as one matched set, and the system's code-compliance listing, drainage data, wind load data, and fire test data are properties of the set rather than of any component within it. A base coat from one system over an insulation board from another, or a substituted water-resistive barrier, is a different assembly from the one that was tested. {note}
+
+## Two water management classes are within scope, and the choice between them is the largest single configuration decision the standard carries. An EIFS with drainage provides a water-resistive barrier on the sheathing and a drained cavity behind the insulation, so water that passes the finish reaches a drainage plane and weeps back out at the base. A barrier EIFS has no drainage cavity, and the finish face together with its sealed joints and terminations is the whole of the water management. {note}
+
+## Where the wall behind the system is moisture-sensitive and incidental water reaches it, the absence of a drainage path turns an ordinary sealant or flashing defect into concealed accumulation against sheathing and framing, which is the mechanism behind the barrier EIFS moisture failures of the 1990s and behind the building code's present drainage requirement over framed construction. Where the substrate is concrete or unit masonry, the substrate itself is not moisture-sensitive in the same way, and the code recognizes that difference. {note}
+
+## The boundary of work under this standard runs from the face of the finish back to and including the water-resistive barrier on the sheathing and the means of drainage. The following are boundaries of this standard rather than work it governs: {note}
+
+- The exterior sheathing and the framing or structure behind it, which are furnished under the framing and sheathing scope and are referenced here for the properties the EIFS depends on
+- The continuous air barrier where it is a system separate from the EIFS water-resistive barrier, covered by [[sync/air-barriers]]
+- The stud cavity insulation and the continuous insulation of the wall assembly generally, covered by [[sync/building-thermal-insulation]]
+- The sheet metal flashing, copings, and trim that meet the EIFS, covered by [[sync/sheet-metal-flashing-and-trim]] and [[sync/through-wall-flashing]]
+- The perimeter and movement joint sealants and their backing, covered by [[sync/joint-sealants]] and [[sync/exterior-weather-sealants]]
+- The windows, doors, storefronts, and curtain walls as manufactured units, covered by [[sync/glazing]], [[sync/glazed-curtain-walls]], and [[sync/aluminum-entrances-and-storefronts]]
+
+## The connection of the EIFS to each of the systems listed above is within this standard even where the adjoining system is not. {note}
+
+## The EIFS shall comply with the exterior wall provisions of the adopted building code, with ASTM E2568, and with ASTM C1397.
+
+## The EIFS shall be installed in accordance with the manufacturer's published instructions for the listed system.
+
+## The water-resistive barrier, adhesive, insulation board, base coat, reinforcing mesh, and finish coat shall be components of one manufacturer's listed system and shall not be mixed across systems.
+
+# Referenced Standards {toc}
+
+## Materials, application, and installation shall comply with the latest adopted edition of each of the following unless a specific edition is cited in the Contract Documents.
+
+## Where the Contract Documents, the adopted codes, the manufacturer's published instructions, or a referenced standard conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.
+
+| Standard | Title |
+|----------|-------|
+| IBC | International Building Code (exterior wall, weather protection, and foam plastic provisions) |
+| IECC | International Energy Conservation Code |
+| ASCE 7 | Minimum Design Loads and Associated Criteria for Buildings and Other Structures |
+| ASTM E2568 | Standard Specification for PB Exterior Insulation and Finish Systems |
+| ASTM C1397 | Standard Practice for Application of Class PB Exterior Insulation and Finish Systems (EIFS) and EIFS with Drainage |
+| ASTM E2570 / E2570M | Standard Test Methods for Evaluating Water-Resistive Barrier (WRB) Coatings Used under Exterior Insulation and Finish Systems (EIFS) or EIFS with Drainage |
+| ASTM E2273 | Standard Test Method for Determining the Drainage Efficiency of Exterior Insulation and Finish Systems (EIFS) Clad Wall Assemblies |
+| ASTM E2486 / E2486M | Standard Test Method for Impact Resistance of Class PB and PI Exterior Insulation and Finish Systems (EIFS) |
+| ASTM E2098 | Standard Test Method for Determining Tensile Breaking Strength of Glass Fiber Reinforcing Mesh for Use in Class PB Exterior Insulation and Finish Systems (EIFS), After Exposure to a Sodium Hydroxide Solution |
+| ASTM E2430 / E2430M | Standard Specification for Expanded Polystyrene (EPS) Thermal Insulation Boards for Use in Exterior Insulation and Finish Systems (EIFS) |
+| ASTM C578 | Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation |
+| ASTM C1177 / C1177M | Standard Specification for Glass Mat Gypsum Substrate for Use as Sheathing |
+| ASTM C1396 / C1396M | Standard Specification for Gypsum Board |
+| ASTM E84 | Standard Test Method for Surface Burning Characteristics of Building Materials |
+| UL 723 | Test for Surface Burning Characteristics of Building Materials |
+| NFPA 285 | Standard Fire Test Method for Evaluation of Fire Propagation Characteristics of Exterior Non-Load-Bearing Wall Assemblies Containing Combustible Components |
+| NFPA 268 | Standard Test Method for Determining Ignitibility of Exterior Wall Assemblies Using a Radiant Heat Energy Source |
+| ASTM E330 | Standard Test Method for Structural Performance of Exterior Windows, Doors, Skylights, and Curtain Walls by Uniform Static Air Pressure Difference |
+| ASTM E331 | Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls by Uniform Static Air Pressure Difference |
+| ASTM E283 | Standard Test Method for Determining Rate of Air Leakage Through Exterior Windows, Curtain Walls, and Doors Under Specified Pressure Differences Across the Specimen |
+| ASTM E1105 | Standard Test Method for Field Determination of Water Penetration of Installed Exterior Windows, Skylights, Doors, and Curtain Walls, by Uniform or Cyclic Static Air Pressure Difference |
+| ASTM E96 | Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials |
+| AAMA 501.2 | Quality Assurance and Diagnostic Water Leakage Field Check of Installed Storefronts, Curtain Walls, and Sloped Glazing Systems |
+| ICC-ES AC219 | Acceptance Criteria for Exterior Insulation and Finish Systems |
+| ICC-ES AC235 | Acceptance Criteria for EIFS Clad Drainage Wall Assemblies |
+
+# Submittals {toc}
+
+## Action Submittals {toc}
+
+### The system's drainage, wind load, and fire performance and its code-compliance listing are all properties of a specific tested assembly and cannot be evaluated component by component, so the EIFS is reviewed as one coordinated package identifying a single manufacturer's complete matched system. {note}
+
+### The Contractor shall submit the following for the Engineer of Record's review and return before procurement and application:
+
+- Product data for the complete EIFS, identifying the manufacturer's system by name, the water management class, the water-resistive barrier product and its evaluation under ASTM E2570, the drainage means, the insulation board type with its minimum and maximum permitted thickness, the adhesive and base coat, the reinforcing mesh weights and impact classes, and the finish coat type and texture
+- The current code-compliance evaluation report for the specific system, identifying the acceptance criteria under which it was evaluated and confirming compliance with the exterior wall provisions of the adopted building code
+- Drainage efficiency test data for the clad assembly determined per ASTM E2273
+- Evidence of compliance with the vertical and lateral flame propagation provisions of the adopted building code for the wall assembly as designed, consisting of a passing NFPA 285 test report for that assembly or an engineering analysis extending a tested assembly
+- Surface burning characteristics test reports per ASTM E84 or UL 723 for the insulation and for the system, and the foam plastic compliance path proposed under the adopted building code
+- Impact resistance classification per ASTM E2486 for each base coat and mesh assembly proposed, with a wall diagram or schedule keying each impact class to the wall areas that receive it
+- Tensile breaking strength of the reinforcing mesh after alkali exposure determined per ASTM E2098
+- Shop drawings showing EIFS layout, reveal and expansion joint locations and profiles, every termination and back-wrapped edge, base terminations with weeps, head, jamb, and sill conditions at openings, inside and outside corners, and the relationship of the EIFS to the flashings, sealant joints, and control layers behind and around it
+- Color and texture samples applied on the actual base coat and mesh substrate, of sufficient size to evaluate color, texture, and aggregate in natural daylight
+- The applicator's manufacturer certification and the manufacturer's published installation instructions for the listed system
+- A written field water test plan where field water testing is indicated in the datasheet, identifying the conditions to be tested, the test method, and the acceptance criteria
+
+```datasheet
+label: Action Submittals Required
+type: checkbox
+options:
+ - "Complete EIFS product data for one matched listed system"
+ - "Code-compliance evaluation report for the specific system"
+ - "Drainage efficiency test data per ASTM E2273"
+ - "Exterior wall flame propagation compliance evidence for the assembly as designed"
+ - "Surface burning characteristics reports and foam plastic compliance path"
+ - "Impact resistance classification per ASTM E2486 with an impact class wall diagram"
+ - "Reinforcing mesh alkali exposure strength data per ASTM E2098"
+ - "Shop drawings for layout, joints, terminations, openings, and control layer interfaces"
+ - "Color and texture samples on the actual base coat substrate"
+ - "Applicator certification and manufacturer installation instructions"
+ - "Field water test plan"
+default:
+ - "Complete EIFS product data for one matched listed system"
+ - "Code-compliance evaluation report for the specific system"
+ - "Drainage efficiency test data per ASTM E2273"
+ - "Exterior wall flame propagation compliance evidence for the assembly as designed"
+ - "Surface burning characteristics reports and foam plastic compliance path"
+ - "Impact resistance classification per ASTM E2486 with an impact class wall diagram"
+ - "Shop drawings for layout, joints, terminations, openings, and control layer interfaces"
+ - "Color and texture samples on the actual base coat substrate"
+ - "Applicator certification and manufacturer installation instructions"
+```
+
+### The EIFS shall be submitted as one coordinated package identifying a single manufacturer's complete listed system.
+
+### Piecemeal submittal of individual components drawn from more than one manufacturer's system shall not be accepted.
+
+## Informational Submittals {toc}
+
+### Informational submittals establish who is qualified to do the work and how the concealed portions will be proven, and they are due early enough that a deficiency can still be corrected by substitution rather than by demolition. {note}
+
+### The Contractor shall submit the following for the Engineer of Record's information before EIFS work begins:
+
+- The applicator's record of completed EIFS projects of comparable type, scale, and complexity, identifying the system used on each
+- A written quality control plan identifying the inspection hold points, the party performing each inspection, and the record forms to be used
+- The manufacturer's field service schedule identifying who will attend and at which milestones
+- A sequencing plan identifying, for each flashing, termination, and sealant joint condition, which trade installs each component and in what order
+- Cold weather and hot weather application procedures where work is scheduled outside the manufacturer's published ambient and substrate conditions
+- Written confirmation from the EIFS manufacturer that the proposed joint sealants and any required primers are compatible with, and will adhere to, the specified base coat and finish
+
+```datasheet
+label: Informational Submittals Required
+type: checkbox
+options:
+ - "Applicator record of comparable completed projects"
+ - "Quality control plan with inspection hold points"
+ - "Manufacturer field service schedule"
+ - "Trade responsibility and sequencing plan for flashings, terminations, and sealant joints"
+ - "Cold weather and hot weather application procedures"
+ - "Manufacturer confirmation of sealant compatibility and adhesion"
+default:
+ - "Applicator record of comparable completed projects"
+ - "Quality control plan with inspection hold points"
+ - "Manufacturer field service schedule"
+ - "Trade responsibility and sequencing plan for flashings, terminations, and sealant joints"
+ - "Manufacturer confirmation of sealant compatibility and adhesion"
+```
+
+## Closeout Submittals {toc}
+
+### The closeout package is the only durable record that the concealed layers were built as specified, because none of them can be re-examined once the finish coat is on. {note}
+
+### At Substantial Completion the Contractor shall submit the following before the EIFS work is accepted:
+
+- Executed manufacturer system warranty and executed Contractor installation warranty
+- Field water test reports where field water testing was performed, recording each condition tested, the result, and the repair and re-test of each failure
+- The moisture survey report where a survey was performed
+- Marked-up as-built shop drawings showing actual reveal, expansion joint, and field-cut conditions and each deviation from the approved details
+- Daily application records, including ambient and substrate temperature and substrate moisture condition at the time each coat was applied
+- The manufacturer's field reports from each site visit
+- Maintenance instructions covering cleaning, periodic sealant joint inspection, and finish repair
+- Turnover of spare finish material and the recorded batch numbers of the installed finish
+
+```datasheet
+label: Closeout Submittals Required
+type: checkbox
+options:
+ - "Executed manufacturer system warranty and Contractor installation warranty"
+ - "Field water test reports"
+ - "Moisture survey report"
+ - "Marked-up as-built shop drawings"
+ - "Daily application records with ambient and substrate conditions"
+ - "Manufacturer field reports"
+ - "Maintenance instructions"
+ - "Spare finish material and recorded batch numbers"
+default:
+ - "Executed manufacturer system warranty and Contractor installation warranty"
+ - "Marked-up as-built shop drawings"
+ - "Daily application records with ambient and substrate conditions"
+ - "Manufacturer field reports"
+ - "Maintenance instructions"
+```
+
+# Applicator Qualification and Manufacturer Involvement {toc}
+
+## Applicator Qualification {toc}
+
+### EIFS performance depends on field workmanship to an unusual degree. The continuity of the water-resistive barrier, the embedment of the mesh in the base coat, the back-wrapping of every edge, and the detailing of terminations all determine whether the wall performs, and all of them are concealed by the finish coat and cannot be inspected afterward. {note}
+
+### Manufacturer certification programs qualify an applicator for one named system and tie the system warranty to that qualification. A record of comparable completed projects instead demonstrates that the applicator has executed the scale and complexity the project presents. The two verify different things, and a project may require either or both. {note}
+
+### The applicator's manufacturer certification shall be as indicated in the datasheet.
+
+```datasheet
+label: Applicator Manufacturer Certification
+type: radio
+options:
+ - "Certified or licensed by the manufacturer of the specified EIFS"
+ - "Certified or licensed by the manufacturer of any EIFS of the same class"
+ - "No manufacturer certification required"
+default: "Certified or licensed by the manufacturer of the specified EIFS"
+```
+
+### The applicator shall submit a record of not less than the number of comparable completed EIFS projects indicated in the datasheet, each of comparable type, scale, and complexity.
+
+```datasheet
+label: Minimum Comparable Completed Projects
+type: range
+unit: projects
+options:
+ min: 0
+ max: 10
+ setpoints: [0, 1, 2, 3, 5, 10]
+```
+
+### Where no number of comparable completed projects is indicated in the datasheet, the applicator shall submit a project record and the Engineer of Record shall determine whether it demonstrates comparable experience.
+
+### A certified applicator or a supervisor employed by the certified applicator shall be present on site whenever EIFS work is in progress.
+
+## Manufacturer Field Services {toc}
+
+### Manufacturer system warranties are commonly conditioned on documented site visits by the manufacturer's technical representative. A visit that was never scheduled is a warranty that was never earned, and the omission is normally discovered only when a claim is made. {note}
+
+### The Contractor shall schedule and coordinate the EIFS manufacturer's field visits at the milestones indicated in the datasheet.
+
+```datasheet
+label: Manufacturer Field Visit Milestones
+type: checkbox
+options:
+ - "Preinstallation conference"
+ - "Mockup construction"
+ - "Water-resistive barrier installation before cover-up"
+ - "Start of field application"
+ - "First installation of each termination and joint type"
+ - "Periodic visits during application"
+ - "Final inspection before acceptance"
+default:
+ - "Mockup construction"
+ - "Water-resistive barrier installation before cover-up"
+ - "Start of field application"
+ - "Periodic visits during application"
+```
+
+### The manufacturer's technical representative shall record each visit in a written field report identifying the work observed, each nonconforming condition, and the corrective action directed.
+
+### The manufacturer's technical representative shall confirm in writing that the application conforms to the requirements on which the system warranty depends.
+
+## Preinstallation Conference {toc}
+
+### The great majority of EIFS water entry originates at trade boundaries and at openings rather than in the field of the wall, and the boundary that most often fails is one that two subcontractors each believed the other was closing. {note}
+
+### The purpose of the conference is to fix on paper, before any material is installed, which trade installs each part of every flashing, termination, and sealant joint, in what sequence, and how responsibility for the continuity of the water-resistive barrier and the drainage path is handed off. {note}
+
+### The Contractor shall convene a preinstallation conference before EIFS work begins where the datasheet indicates the conference is required.
+
+```datasheet
+label: Preinstallation Conference
+type: radio
+options:
+ - "Required before EIFS work begins"
+ - "Not required"
+default: "Required before EIFS work begins"
+```
+
+### The Contractor shall require attendance by the Engineer of Record, the EIFS manufacturer's technical representative, the EIFS applicator, and the installer of every adjacent trade whose work meets the system, including framing and sheathing, air barrier, sheet metal flashing, fenestration, and joint sealants.
+
+### The conference shall resolve, in writing, the trade responsibility and installation sequence for each flashing, termination, and sealant joint condition shown on the approved shop drawings.
+
+### The Contractor shall distribute the written record of the conference to every attendee and shall include it in the closeout submittals.
+
+## Mockup {toc}
+
+### A mockup converts an argument about workmanship into a physical benchmark the Engineer of Record and the manufacturer have both accepted, and it exposes detailing problems while the correction still costs a day rather than a facade. {note}
+
+### The Contractor shall construct an EIFS mockup of the type indicated in the datasheet.
+
+```datasheet
+label: Mockup Type
+type: radio
+options:
+ - "Freestanding mockup constructed away from the building"
+ - "In-place mockup constructed in the work and permitted to remain where accepted"
+ - "Not required"
+```
+
+### The mockup shall be of the wall area indicated in the datasheet.
+
+```datasheet
+label: Mockup Wall Area
+type: range
+unit: ft²
+options:
+ min: 25
+ max: 500
+ step: 25
+```
+
+### The mockup shall incorporate the conditions indicated in the datasheet, each built with the materials, sequence, and workmanship proposed for the work.
+
+```datasheet
+label: Mockup Conditions
+type: checkbox
+options:
+ - "Water-resistive barrier on the sheathing"
+ - "Field of the wall in the specified finish texture and color"
+ - "Aesthetic reveal"
+ - "Expansion joint"
+ - "Inside corner and outside corner"
+ - "Back-wrapped edge"
+ - "Base termination with weeps"
+ - "Window or door perimeter with its flashing and sealant joint"
+ - "Transition between two impact mesh classes"
+ - "Penetration through the system"
+default:
+ - "Water-resistive barrier on the sheathing"
+ - "Field of the wall in the specified finish texture and color"
+ - "Aesthetic reveal"
+ - "Back-wrapped edge"
+ - "Base termination with weeps"
+ - "Window or door perimeter with its flashing and sealant joint"
+```
+
+### The mockup shall be reviewed and accepted in writing by the Engineer of Record and the manufacturer's technical representative before field application begins, and shall thereafter establish the standard of workmanship, color, and texture for the work.
+
+### The accepted mockup shall remain undisturbed and available for comparison until the EIFS work is accepted.
+
+## Special Inspection {toc}
+
+### The adopted building code requires special inspection of some EIFS configurations and exempts others, and the trigger turns on the water management class and the substrate rather than on the size of the work. {note}
+
+### Special inspection of the EIFS shall be provided as indicated in the datasheet.
+
+```datasheet
+label: Special Inspection of the EIFS
+type: radio
+options:
+ - "Required, performed by an approved agency engaged by the Owner"
+ - "Required, performed by an approved agency engaged by the Contractor"
+ - "Not required under the adopted building code for this assembly"
+```
+
+### The Contractor shall provide the special inspector access to the work and shall give notice before concealing any portion of the assembly subject to special inspection.
+
+# Water Management Class {toc}
+
+## The water management class determines whether the wall has a second line of defense. It sets what must be submitted, what must be tested, how the insulation is attached, how the base is terminated, and how much a defect in a sealant joint or a flashing costs the assembly. {note}
+
+## The EIFS water management class shall be as indicated in the datasheet.
+
+```datasheet
+label: EIFS Water Management Class
+type: radio
+options:
+ - "EIFS with drainage, with a drained cavity between the insulation and the water-resistive barrier"
+ - "Barrier EIFS, with the insulation adhered directly to the substrate and no drainage cavity"
+default: "EIFS with drainage, with a drained cavity between the insulation and the water-resistive barrier"
+```
+
+## Where the adopted building code requires drainage for the construction type and substrate of the project, an EIFS with drainage shall be provided regardless of the class indicated in the datasheet.
+
+## Where a barrier EIFS is indicated in the datasheet, the Contractor shall submit the code-compliance evaluation report that evaluates the specific system without drainage, together with the code provision under which it is permitted for the substrate on this project.
+
+## Drainage Cavity and Drainage Efficiency {toc}
+
+### ASTM E2273 measures what fraction of the water introduced behind the lamina leaves the assembly again, and the resulting drainage efficiency is the number that separates a drained wall from one that merely has a cavity. The building code and ASTM E2568 set the minimum for EIFS with drainage at 90 percent. {note}
+
+### The drainage means shall be as indicated in the datasheet, and shall be continuous behind the insulation from the field of the wall to weeps at every base and horizontal termination.
+
+```datasheet
+label: Drainage Means
+type: radio
+options:
+ - "Vertically grooved or channeled insulation board"
+ - "Drainage mat or entangled net layer behind the insulation"
+ - "Adhesive applied in vertical ribbons forming drainage channels"
+ - "Drainage board with integral channels between the insulation and the water-resistive barrier"
+ - "Not applicable to a barrier EIFS"
+```
+
+### The clad wall assembly shall demonstrate a drainage efficiency of not less than the value indicated in the datasheet when tested in accordance with ASTM E2273.
+
+```datasheet
+label: Minimum Drainage Efficiency
+type: range
+unit: '%'
+options:
+ min: 0
+ max: 100
+ setpoints: [0, 90, 95, 100]
+default: 90
+```
+
+### A drainage efficiency of zero records a barrier EIFS, which has no drainage cavity and therefore no drainage to measure. {note}
+
+### The drainage cavity shall not be bridged or dammed by adhesive, base coat, insulation, sealant, or flashing at any point between the field of the wall and the weeps.
+
+### The drainage cavity shall discharge to the exterior through weeps at every base termination and at every horizontal termination that interrupts the cavity.
+
+## Barrier EIFS Without a Drainage Cavity {toc}
+
+### Requirements in this article apply where a barrier EIFS is indicated in the datasheet. {note}
+
+### In a barrier EIFS the finish face and its joints are the entire water management, so the durability of the wall becomes a function of sealant service life and of periodic inspection and renewal rather than of a drainage path. Where the sealant joints are not maintained on a defined interval, water entry has no route out of the assembly. {note}
+
+### Where a barrier EIFS is indicated in the datasheet, the substrate shall be one over which the manufacturer's listed barrier system is evaluated and which the adopted building code permits without drainage.
+
+### Where a barrier EIFS is indicated in the datasheet, the insulation shall be adhered to the substrate over the adhesive coverage the listed system requires for the design wind pressure, and no drainage means shall be provided.
+
+### Where a barrier EIFS is indicated in the datasheet, every joint, termination, penetration, and sealant joint shall be detailed to shed water at the finish face, and each shall be shown on the approved shop drawings.
+
+### Where a barrier EIFS is indicated in the datasheet, the maintenance instructions shall state the inspection interval for sealant joints and terminations on which the water management of the wall depends.
+
+# Water-Resistive Barrier {toc}
+
+## In an EIFS with drainage the water-resistive barrier, not the finish face, is the layer that keeps the building dry. It has to be continuous across the whole wall and lapped or sealed shingle-fashion into every flashing so that water reaching it drains down and out rather than sideways into the assembly. {note}
+
+## The barrier is most often a fluid-applied coating that is part of the listed system and that doubles as the adhesive bedding for the insulation, but sheet products are used where the system is listed over them. The choice changes the substrate preparation, the exposure tolerance before cover-up, and the way penetrations are sealed. {note}
+
+## The water-resistive barrier shall be a component of the listed EIFS, shall be evaluated in accordance with ASTM E2570 where it is a coating, and shall be of the type indicated in the datasheet.
+
+```datasheet
+label: Water-Resistive Barrier Type
+type: radio
+options:
+ - "Fluid-applied coating, trowel, roller, or spray applied"
+ - "Self-adhered sheet membrane"
+ - "Mechanically fastened sheet or building wrap"
+ - "Integral water-resistive barrier sheathing with sealed joints and fastener heads"
+default: "Fluid-applied coating, trowel, roller, or spray applied"
+```
+
+## The water-resistive barrier shall be continuous across the sheathing and shall be integrated with the flashings at every opening, penetration, and termination so that water reaching it drains down and out to the exterior.
+
+## Penetrations of the water-resistive barrier shall be sealed with the accessory materials the EIFS manufacturer supplies or approves for the barrier in use.
+
+## The water-resistive barrier shall not remain exposed to sunlight, weather, or construction traffic longer than the manufacturer's published exposure period before it is covered.
+
+## Relationship to the Wall Air Barrier {toc}
+
+### Whether the EIFS water-resistive barrier also carries the air control function is a decision independent of which barrier type is used, and it changes what is submitted, what is tested, and who is responsible for the plane. Where the two functions are combined, the barrier must additionally meet the air leakage and continuity provisions that govern an air barrier; where they are separate, a second plane exists behind the EIFS whose own continuity has to be detailed and inspected. {note}
+
+### The relationship between the EIFS water-resistive barrier and the wall air barrier shall be as indicated in the datasheet.
+
+```datasheet
+label: Water-Resistive Barrier and Air Barrier Relationship
+type: radio
+options:
+ - "Combined, the EIFS water-resistive barrier also serves as the continuous air barrier"
+ - "Separate, a discrete air barrier is provided in addition to the EIFS water-resistive barrier"
+default: "Combined, the EIFS water-resistive barrier also serves as the continuous air barrier"
+```
+
+### Where the datasheet indicates the functions are combined, the air barrier requirements of [[sync/air-barriers]] shall apply to the EIFS water-resistive barrier and the two functions shall be detailed, installed, and verified as one continuous plane.
+
+### Where the datasheet indicates the functions are separate, the EIFS water-resistive barrier shall be lapped and sealed to the air barrier specified in [[sync/air-barriers]] so that neither plane is interrupted at the transition.
+
+# Structural Performance Under Wind Load {toc}
+
+## The lamina of an EIFS carries little load itself. The wind resistance of the wall is governed by the bond or the fastening of the insulation to the substrate and by the capacity of the sheathing and the framing behind it, and the system's listed wind load value is developed for one specific substrate, water-resistive barrier, and attachment method. {note}
+
+## Corner and edge zones see substantially higher outward suction than the field of the wall, which is why they govern the adhesive coverage or the fastener pattern and the sheathing fastening in those zones even though the field of the wall sets the nominal design pressure. {note}
+
+## The design wind pressure for the field of the wall shall be as indicated in the datasheet, determined in accordance with ASCE 7 for the building's height, exposure, risk category, and wall zone.
+
+```datasheet
+label: Design Wind Pressure at the Field of the Wall
+type: range
+unit: psf
+drawing_ref: "structural drawings"
+options:
+ min: 0
+ max: 200
+ setpoints: [0, 20, 30, 40, 50, 60, 75, 90, 100, 120, 150, 200]
+default: deferred
+```
+
+## The design wind pressure for corner and edge zones shall be as indicated in the datasheet, determined in accordance with ASCE 7 for the building's height, exposure, risk category, and wall zone.
+
+```datasheet
+label: Design Wind Pressure at Corner and Edge Zones
+type: range
+unit: psf
+drawing_ref: "structural drawings"
+options:
+ min: 0
+ max: 300
+ setpoints: [0, 30, 45, 60, 75, 90, 120, 150, 200, 250, 300]
+default: deferred
+```
+
+## The EIFS, its insulation attachment, and the supporting sheathing and framing shall sustain the design positive and negative wind pressures without insulation disengagement, sheathing failure, or cracking of the lamina.
+
+## The as-built substrate, water-resistive barrier, and attachment method shall match the configuration for which the system's wind load evaluation was developed.
+
+## The adhesive coverage or the fastener pattern shall be increased in corner and edge zones to the extent the system listing requires for the design pressure recorded for those zones.
+
+# Thermal Performance {toc}
+
+## An EIFS places its insulation outboard of the framing, so the insulation is not interrupted by studs and the thermal bridging that dominates a cavity-insulated framed wall is largely eliminated. The insulation fasteners, where mechanical attachment is used, are the remaining bridge. {note}
+
+## Expanded polystyrene manufactured for EIFS contributes a nominal thermal resistance in the range of R-3.6 to R-4.0 per inch, so the continuous insulation contribution of the system follows directly from the board thickness. {note}
+
+## The continuous insulation thermal resistance provided by the EIFS shall be as indicated in the datasheet.
+
+```datasheet
+label: Continuous Insulation Thermal Resistance Provided by the EIFS
+type: range
+unit: R (h·ft²·°F/Btu)
+drawing_ref: "energy code compliance documentation"
+options:
+ min: 0
+ max: 40
+ setpoints: [0, 2.5, 3.8, 5, 6, 7.5, 10, 11.4, 12.5, 15, 20, 25, 30, 40]
+default: deferred
+```
+
+## The assembly thermal performance of the wall of which the EIFS forms a part, and the cavity insulation behind the sheathing, shall be as specified in [[sync/building-thermal-insulation]].
+
+## The Contractor shall not substitute an insulation thickness that reduces the continuous insulation thermal resistance below the value on which the project's energy code compliance documentation relies.
+
+# Fire Performance {toc}
+
+## Expanded polystyrene is a foam plastic and is combustible, so essentially every EIFS wall contains a combustible component and falls within the foam plastic and exterior wall flame propagation provisions of the building code. The compliance path is settled before the system is selected, because it constrains the insulation thickness, the sheathing, and the water-resistive barrier together. {note}
+
+## Surface Burning and Foam Plastic Provisions {toc}
+
+### The foam plastic insulation shall have a flame spread index not greater than 75 and a smoke-developed index not greater than 450 when tested in accordance with ASTM E84 or UL 723 at the thickness intended for use, except where it is used in an assembly tested and listed as a whole.
+
+### The surface burning classification of the insulation shall be as indicated in the datasheet.
+
+```datasheet
+label: Insulation Surface Burning Classification
+type: radio
+options:
+ - "Class A, flame spread index of 25 or less"
+ - "Class B, flame spread index of 26 through 75"
+default: "Class A, flame spread index of 25 or less"
+```
+
+### The foam plastic insulation shall be separated from the interior of the building by the thermal barrier the adopted building code requires, except where the code provides an exception for the specific application.
+
+### The thermal barrier separating the foam plastic from the interior is part of the interior construction rather than of the EIFS, and is specified in [[sync/gypsum-board-assemblies]] where it is gypsum board. {note}
+
+## Vertical and Lateral Flame Propagation {toc}
+
+### NFPA 285 is a full-scale fire test of a complete wall assembly that measures whether fire spreads vertically up the exterior face and laterally through the wall beyond stated limits. It exists because a foam plastic insulation, however well it performs in a small-scale surface burning test, can carry flame up a multi-story facade if the assembly is not detailed to interrupt that spread. {note}
+
+### Compliance is a property of the whole tested assembly, including the sheathing, the water-resistive barrier, the insulation type and thickness, the base and finish coats, and the back-up wall. Substituting any combustible component, or exceeding the tested insulation thickness, describes an assembly that was not the one tested. {note}
+
+### Compliance with the vertical and lateral flame propagation provisions of the adopted building code shall be established on the basis indicated in the datasheet.
+
+```datasheet
+label: Flame Propagation Compliance Basis
+type: radio
+options:
+ - "Assembly tested to NFPA 285 acceptance criteria"
+ - "Engineering analysis extending an NFPA 285 tested assembly, prepared by a fire protection engineer"
+ - "Exception under the adopted building code for the assembly as designed"
+ - "Not required, the building's type of construction does not invoke the provision"
+```
+
+### Where compliance rests on an engineering analysis, the analysis shall identify the tested assembly on which it relies, shall state each variation from that assembly, and shall state the basis for accepting each variation.
+
+### The Contractor shall not apply the EIFS until the flame propagation compliance basis for the assembly as designed is documented and submitted.
+
+### The Contractor shall not substitute any component of an assembly whose flame propagation compliance depends on a test or an analysis without submitting revised evidence of compliance for the substituted assembly.
+
+# Sheathing Substrate {toc}
+
+## The sheathing is what the water-resistive barrier and the insulation attach to, and it is the last line of defense where the barrier is breached. Glass mat gypsum sheathing resists moisture better than paper-faced gypsum sheathing, whose face feeds mold and loses strength when wet, and concrete and unit masonry are not moisture-sensitive in the same way at all. {note}
+
+## The substrate also determines what the system is listed over, because the wind load, drainage, and fire test data were developed on one specific substrate. {note}
+
+## The exterior sheathing substrate receiving the EIFS shall be as indicated in the datasheet, and shall be a substrate over which the manufacturer's listed system is evaluated.
+
+```datasheet
+label: Exterior Sheathing Substrate
+type: select
+drawing_ref: "wall type schedule"
+options:
+ - "Glass mat gypsum sheathing per ASTM C1177"
+ - "Paper-faced gypsum sheathing per ASTM C1396"
+ - "Fiber-reinforced or fiber-mat cement sheathing"
+ - "Exterior wood structural panel sheathing"
+ - "Cast-in-place or precast concrete"
+ - "Unit masonry"
+ - "Portland cement plaster or existing stucco"
+default: deferred
+```
+
+## The substrate shall be sound, dry, securely fastened to the structure, and free of dust, laitance, form release agents, efflorescence, coatings, and projections before the water-resistive barrier is applied.
+
+## The substrate shall be flat within the maximum deviation indicated in the datasheet, measured in any direction.
+
+```datasheet
+label: Maximum Substrate Deviation in 4 ft
+type: range
+unit: in
+options:
+ min: 0.125
+ max: 0.5
+ setpoints: [0.125, 0.1875, 0.25, 0.375, 0.5]
+```
+
+## Where no maximum substrate deviation is indicated in the datasheet, the EIFS manufacturer's published substrate flatness tolerance shall govern, and that value shall be stated in the product data submittal.
+
+## Where the parties disagree whether a substrate is acceptable to receive the EIFS, the Engineer of Record shall make the initial determination.
+
+# Insulation Board {toc}
+
+## EPS Board Conformance and Aging {toc}
+
+### The insulation used in an EIFS is a low-density expanded polystyrene manufactured and aged specifically for the application rather than generic foam board. Fresh EPS taken too soon from the mold continues to shrink, and a board that shrinks after it is laminated opens joints and telegraphs cracks through the finish. {note}
+
+### The insulation board shall conform to ASTM E2430 and to the applicable type of ASTM C578, and shall be manufactured for use in an EIFS.
+
+### The insulation board shall be aged not less than the period indicated in the datasheet before it is cut and installed.
+
+```datasheet
+label: Minimum EPS Aging Period Before Installation
+type: range
+unit: weeks
+options:
+ min: 0
+ max: 12
+ setpoints: [0, 2, 4, 6, 8, 12]
+```
+
+### Where no aging period is indicated in the datasheet, the aging period required by ASTM E2430 for the product shall govern, and that period shall be stated in the product data submittal.
+
+### The insulation board shall be cut square and flat and shall be free of warp, crushed edges, and surface degradation when installed.
+
+### Insulation board that has been exposed to sunlight long enough to yellow or dust at the surface shall be rasped to sound material before the base coat is applied.
+
+## EPS Board Thickness {toc}
+
+### Board thickness is bounded at the low end by the thickness below which back-wrapping and fastening are not practical, and at the high end by the thickness of the assembly that was fire tested, because the insulation is the fuel load in that test. {note}
+
+### The insulation board thickness shall be as indicated in the datasheet.
+
+```datasheet
+label: EPS Board Thickness
+type: range
+unit: in
+drawing_ref: "wall type schedule and exterior wall details"
+options:
+ min: 0.75
+ max: 12
+ setpoints: [0.75, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10, 12]
+default: deferred
+```
+
+### The insulation board thickness shall be not less than the minimum thickness of the manufacturer's listed system.
+
+### The insulation board thickness shall not exceed the thickness of the assembly on which the project's flame propagation compliance relies.
+
+## Insulation Attachment {toc}
+
+### Adhesive attachment develops its bond to the water-resistive barrier rather than to the sheathing itself, so the barrier and the substrate have to be the ones the system was load tested over. Applied in ribbons or with a notched trowel, the same adhesive forms the vertical channels that drain the cavity. {note}
+
+### Mechanical fasteners with washers hold where an adhesive bond is not achievable or where the schedule will not allow the substrate to dry, but every fastener is a designed penetration of the water-resistive barrier and each one bridges the cavity locally. {note}
+
+### Board joints that align with substrate joints or land on the corner of an opening concentrate stress at a line where the substrate already moves, and the crack propagates through the lamina. {note}
+
+### The insulation shall be attached to the substrate by the means indicated in the datasheet, over the coverage or at the pattern the listed system requires for the design wind pressure.
+
+```datasheet
+label: Insulation Attachment Method
+type: radio
+options:
+ - "Adhesive bedded to the water-resistive barrier"
+ - "Mechanical fasteners with washers"
+ - "Adhesive and mechanical fasteners combined"
+default: "Adhesive bedded to the water-resistive barrier"
+```
+
+### Where mechanical fasteners penetrate the water-resistive barrier, each penetration shall be sealed or located as the system listing requires.
+
+### Insulation boards shall be installed in a running bond pattern with tight joints, offset from substrate joints and from the corners of openings.
+
+### Gaps between insulation boards wider than the manufacturer's published limit shall be filled with slivers of the same insulation and shall not be filled with base coat, adhesive, or sealant.
+
+# Base Coat and Reinforcing Mesh {toc}
+
+## Base Coat {toc}
+
+### The base coat is the structural skin of an EIFS. It carries the reinforcing mesh, distributes impact and stress across the soft insulation behind it, and forms the surface the finish bonds to. {note}
+
+### The governing workmanship requirement is full embedment of the mesh. Mesh troweled into wet base coat and covered until its weave no longer shows is continuous reinforcement; mesh left at or near the surface is a crack line and a moisture path, and it is the most common base coat defect. {note}
+
+### The base coat shall be the base coat of the listed EIFS and shall be of the type indicated in the datasheet.
+
+```datasheet
+label: Base Coat Type
+type: radio
+options:
+ - "Polymer-based noncementitious base coat, factory mixed and ready to use"
+ - "Polymer-modified cementitious base coat, factory blended dry and field mixed with water"
+ - "Polymer-modified cementitious base coat, field mixed with portland cement"
+```
+
+### The base coat shall be applied over the insulation in the thickness and in the number of passes the manufacturer publishes for the mesh weight in use.
+
+### The reinforcing mesh shall be fully embedded in the base coat, and no mesh color, weave, or pattern shall be visible through the cured base coat.
+
+### The base coat shall be allowed to cure for the period the manufacturer publishes before the finish coat is applied.
+
+## Reinforcing Mesh and Impact Classification {toc}
+
+### The impact resistance of an EIFS is set by its reinforcing mesh. ASTM E2486 defines four classes reached by heavier mesh or by additional layers: Standard at 25 to 49 in-lbf, Medium at 50 to 89 in-lbf, High at 90 to 150 in-lbf, and Ultra High above 150 in-lbf. {note}
+
+### The classes correspond to mesh in the range of roughly 4 to 6 oz/yd² at Standard, on the order of 15 oz/yd² at High, and on the order of 20 oz/yd² or a doubled layup at Ultra High. The industry practice published by the EIFS trade association is High or Ultra High for wall areas within 8 ft of grade. {note}
+
+### An EIFS lamina is thin and the insulation behind it is soft, so the face dents and punctures under foot traffic, carts, vehicles, and maintenance equipment at energies that leave masonry or metal cladding unmarked. Where a wall area is reachable from grade or from a traffic route, that exposure governs the mesh selection for the area. {note}
+
+### The alkalinity of a cementitious base coat degrades uncoated glass fiber over time, which is why the mesh carries an alkali-resistant coating and why its retained strength is measured after alkali exposure rather than as manufactured. {note}
+
+### The reinforcing mesh shall be the alkali-resistant coated glass fiber mesh of the listed EIFS, and its tensile breaking strength after exposure to a sodium hydroxide solution shall be determined in accordance with ASTM E2098.
+
+### The impact classification of the field of the wall shall be as indicated in the datasheet, determined in accordance with ASTM E2486.
+
+```datasheet
+label: Impact Classification at the Field of the Wall
+type: radio
+options:
+ - "Standard, 25 to 49 in-lbf"
+ - "Medium, 50 to 89 in-lbf"
+ - "High, 90 to 150 in-lbf"
+ - "Ultra High, above 150 in-lbf"
+default: "Standard, 25 to 49 in-lbf"
+```
+
+### The impact classification of the lower wall and of exposed areas shall be as indicated in the datasheet, determined in accordance with ASTM E2486.
+
+```datasheet
+label: Impact Classification at the Lower Wall and Exposed Areas
+type: radio
+options:
+ - "Standard, 25 to 49 in-lbf"
+ - "Medium, 50 to 89 in-lbf"
+ - "High, 90 to 150 in-lbf"
+ - "Ultra High, above 150 in-lbf"
+ - "Same classification as the field of the wall"
+```
+
+### The elevated impact classification shall extend from the adjacent finished grade or walking surface up to the height indicated in the datasheet, and shall extend to the full height of exposed outside corners within that zone.
+
+```datasheet
+label: Height of the Elevated Impact Zone Above Finished Grade
+type: range
+unit: ft
+options:
+ min: 0
+ max: 20
+ setpoints: [0, 4, 6, 8, 10, 12, 16, 20]
+```
+
+### Where two impact classifications meet, the heavier mesh shall be lapped behind the lighter mesh across the transition so that no unreinforced gap occurs at the joint.
+
+### Mesh shall be lapped at every joint by not less than the lap width the manufacturer publishes, and butted mesh joints shall not be used.
+
+### Corner mesh, reinforcing strips at the corners of openings, and detail mesh at reveals and terminations shall be installed before the field mesh is applied over them.
+
+# Finish Coat {toc}
+
+## Finish Type {toc}
+
+### The finish coat is the weathering and aesthetic face of the system. In a Class PB EIFS it is a factory-mixed, integrally colored coating applied over the cured base coat, integrally colored so that a chip does not expose a different color underneath, and flexible enough to bridge the hairline movement of the lamina. {note}
+
+### Finish chemistry changes what the wall resists rather than what it looks like. Acrylic finishes resist dirt, fading, and mildew better than cementitious finishes; silicone-enhanced finishes shed water and resist dirt pickup further; elastomeric finishes bridge wider hairline cracking at the cost of a softer, more easily marked surface. {note}
+
+### The finish coat shall be the finish of the listed EIFS, factory mixed and integrally colored, and shall be of the type indicated in the datasheet.
+
+```datasheet
+label: Finish Coat Type
+type: radio
+options:
+ - "Acrylic polymer finish"
+ - "Acrylic polymer finish with a dirt pickup resistant or mildew resistant additive"
+ - "Silicone-enhanced acrylic finish"
+ - "Elastomeric high-flexibility acrylic finish"
+ - "Polymer-modified cementitious finish"
+ - "Mineral silicate finish"
+default: "Acrylic polymer finish"
+```
+
+### The finish coat shall be applied over a cured, clean, and dry base coat in a continuous application from break to break, worked wet edge to wet edge so that no lap line, cold joint, or float mark shows in the completed work.
+
+## Finish Texture and Color {toc}
+
+### Texture is a durability decision as much as an appearance one. Deep, coarse textures hide minor base coat irregularity but hold more dirt in the profile; fine and smooth textures show every substrate imperfection and demand a flatter base coat, and they show trowel and float marks that a coarse aggregate would conceal. {note}
+
+### The finish texture shall be as indicated in the datasheet.
+
+```datasheet
+label: Finish Texture
+type: select
+drawing_ref: "exterior finish schedule"
+options:
+ - "Fine or sand texture"
+ - "Medium aggregate texture"
+ - "Coarse aggregate texture"
+ - "Troweled smooth texture"
+ - "Freeform or swirl texture"
+ - "Rilled or scored texture"
+ - "Rasped or stone-look texture"
+default: deferred
+```
+
+### The finish color shall be as indicated in the datasheet.
+
+```datasheet
+label: Finish Color
+type: text
+drawing_ref: "exterior finish schedule"
+default: deferred
+```
+
+### The finish texture and color shall be confirmed on the accepted mockup before field application begins.
+
+## Finish Light Reflectance {toc}
+
+### A dark finish on an EPS-based EIFS absorbs solar heat, and where the surface temperature approaches the softening range of the polystyrene the board distorts and the bond degrades. This is a temperature limit rather than an aesthetic judgment, and it is why manufacturers publish a minimum light reflectance value for their standard systems and separately list assemblies rated for darker colors. {note}
+
+### The finish light reflectance shall be limited as indicated in the datasheet.
+
+```datasheet
+label: Finish Light Reflectance Policy
+type: radio
+options:
+ - "Light reflectance value at or above the published minimum for the standard system"
+ - "Light reflectance value below the published minimum, using a finish and insulation listed for low reflectance exposure"
+ - "No light reflectance limitation, the system is listed for the full color range"
+default: "Light reflectance value at or above the published minimum for the standard system"
+```
+
+### Where the datasheet indicates a finish below the published minimum light reflectance value, the Contractor shall submit the listing that evaluates the specific finish and insulation for that exposure.
+
+# Aesthetic Reveals {toc}
+
+## Reveals are decorative grooves routed or cut into the insulation to articulate the facade. Their sides and bottom are wall surface, not a free edge, and the insulation remaining at the bottom of the groove is the local thickness of the system at that line. {note}
+
+## Reveal locations and profiles shall be as shown [[drawing: on the exterior elevations and reveal profile details]].
+
+## Aesthetic reveals shall be formed in the insulation and shall be fully back-wrapped.
+
+## Reveals shall be reinforced with base coat and mesh on every face of the groove.
+
+## The sides and bottom of a reveal shall be base-coated, meshed, and finished exactly as the field of the wall is finished, and shall not be left as bare insulation.
+
+## Reveals shall retain not less than the insulation thickness indicated in the datasheet at the bottom of the groove.
+
+```datasheet
+label: Minimum Insulation Thickness Remaining at the Bottom of a Reveal
+type: range
+unit: in
+options:
+ min: 0.25
+ max: 2
+ setpoints: [0.25, 0.375, 0.5, 0.75, 1, 1.5, 2]
+```
+
+## Where no minimum remaining thickness is indicated in the datasheet, the EIFS manufacturer's published minimum insulation thickness at a reveal shall govern, and that value shall be stated in the product data submittal.
+
+## A reveal is not an expansion joint and shall not be relied on to accommodate building movement.
+
+# Expansion and Movement Joints {toc}
+
+## An EIFS expansion joint is a full break through the system down to the substrate, closed with backing and sealant, that lets the building and the cladding move without cracking the lamina. A groove cut partway into the insulation is a reveal and accommodates nothing. {note}
+
+## Joints are required where the structure itself moves, where the substrate changes because two substrates move differently, and at the floor lines of platform-framed construction, which shrinks across the depth of the floor framing as the lumber dries. {note}
+
+## Expansion joints shall be provided through the full thickness of the EIFS, including the insulation, at each condition indicated in the datasheet.
+
+```datasheet
+label: Expansion Joint Locations Required
+type: checkbox
+options:
+ - "At structural expansion and seismic joints"
+ - "Where dissimilar substrates meet"
+ - "At floor lines of platform-framed and other shrinking construction"
+ - "At changes in building height or in structural support"
+ - "Where the EIFS abuts a dissimilar cladding or material"
+ - "At the maximum panel dimension the EIFS manufacturer publishes"
+default:
+ - "At structural expansion and seismic joints"
+ - "Where dissimilar substrates meet"
+ - "At floor lines of platform-framed and other shrinking construction"
+ - "At changes in building height or in structural support"
+ - "Where the EIFS abuts a dissimilar cladding or material"
+```
+
+## Expansion joints shall be located as shown on the approved shop drawings.
+
+## The expansion joint width shall be as indicated in the datasheet, sized for the anticipated movement at the joint.
+
+```datasheet
+label: Expansion Joint Width
+type: range
+unit: in
+drawing_ref: "expansion joint details"
+options:
+ min: 0.25
+ max: 2
+ setpoints: [0.25, 0.375, 0.5, 0.75, 1, 1.5, 2]
+default: deferred
+```
+
+## Each EIFS edge at an expansion joint shall be back-wrapped so that no bare insulation is exposed within the joint.
+
+## The sealant and backing in an expansion joint shall be as specified in [[sync/joint-sealants]], and shall be a sealant the EIFS manufacturer confirms in writing will adhere to the base coat and finish in use.
+
+# Back-Wrapping and Terminations {toc}
+
+## Back-Wrapping of Edges {toc}
+
+### Back-wrapping is the detail that decides whether an EIFS edge is a finished surface or an open hole, and it is the one most often omitted because it has to happen before the field mesh goes on and cannot be added afterward. {note}
+
+### A bare insulation edge admits water into the board and the cavity from the side, bypassing the finish face entirely, and it crushes under the lightest contact because there is no lamina holding it. {note}
+
+### The mesh is turned around the edge of the insulation and bonded back to the substrate or the water-resistive barrier, and the field mesh then laps over that return, so the lamina is continuous around the edge and the insulation is fully encapsulated. {note}
+
+### Every EIFS edge, including terminations, openings, expansion joints, reveals, penetrations, and any location where the system stops, shall be back-wrapped by wrapping the reinforcing mesh and base coat around the edge of the insulation and onto the substrate so that no bare insulation edge is exposed.
+
+### Each edge shall be back-wrapped before the field mesh is lapped over it.
+
+### Back-wrapped edges shall be inspected and accepted before the field mesh and base coat conceal them.
+
+## Base Termination and Weeps {toc}
+
+### The base of an EIFS is where the drainage cavity discharges, and it is the one horizontal edge where gravity delivers every drop the wall collects. A base detailed without a weep path dams the cavity at exactly the point it was built to drain. {note}
+
+### An EIFS carried into soil, paving, or standing water wicks ground moisture up into the insulation and the substrate behind it, and the resulting deterioration is concealed and progressive. This is why manufacturers' listings establish a minimum height above the adjacent surface. {note}
+
+### The base of the EIFS shall be terminated by the means indicated in the datasheet, with a back-wrapped edge and a weep path that drains the cavity to the exterior.
+
+```datasheet
+label: Base Termination Means
+type: radio
+options:
+ - "Manufacturer's drainage or starter track with weeps"
+ - "Back-wrapped edge over through-wall flashing with an open weep at the base"
+ - "Back-wrapped edge over a weep screed"
+```
+
+### The base of the EIFS shall terminate not less than the height indicated in the datasheet above the adjacent finished grade or paving.
+
+```datasheet
+label: EIFS Base Height Above Finished Grade
+type: range
+unit: in
+options:
+ min: 0
+ max: 24
+ setpoints: [0, 2, 4, 6, 8, 12, 18, 24]
+```
+
+### The base of the EIFS shall terminate not less than the height indicated in the datasheet above adjacent roofs, decks, copings, and other horizontal surfaces.
+
+```datasheet
+label: EIFS Base Height Above Roofs, Decks, and Other Horizontal Surfaces
+type: range
+unit: in
+options:
+ min: 0
+ max: 24
+ setpoints: [0, 2, 4, 6, 8, 12, 18, 24]
+```
+
+### Where no base height is indicated in the datasheet for a condition, the EIFS manufacturer's published minimum height above that surface shall govern, and that value shall be stated in the product data submittal.
+
+### Where the datasheet indicates a base height of zero, the Contractor shall submit the manufacturer's listing evidencing that the system is evaluated for termination at the adjacent surface.
+
+### The base termination and its weeps shall not be dammed by base coat, finish, sealant, flashing, adhesive, or backfill.
+
+### The base termination shall be constructed as shown [[drawing: on the base termination detail]].
+
+# Flashing and Sealant Integration {toc}
+
+## Flashing at Openings and Terminations {toc}
+
+### The flashings that frame an EIFS are where the system hands off to the rest of the envelope, and they concentrate the failures: two trades, two materials, and a change of plane, usually installed weeks apart. {note}
+
+### Head flashings turn up behind the water-resistive barrier and discharge over and beyond the finish, sill and base flashings are pan-formed with end dams so water that reaches them is collected and expelled, and copings shed away from the EIFS rather than onto or behind it. {note}
+
+### The sheet metal itself is specified in [[sync/sheet-metal-flashing-and-trim]] and [[sync/through-wall-flashing]]; what this standard requires is that the interface between the EIFS and that metal preserve the continuity of the water-resistive barrier and drain to the exterior. {note}
+
+### Flashings at heads and sills of openings, at horizontal terminations, at parapets and copings, and at penetrations shall be integrated with the water-resistive barrier so that water is diverted to the exterior in front of the system.
+
+### Sill and base flashings shall be pan-formed and shall be provided with end dams.
+
+### The EIFS shall not be used to close a condition that the Contract Documents require to be flashed behind it.
+
+### Flashings and their interfaces with the EIFS shall be constructed as shown [[drawing: on the head, jamb, sill, base, parapet, and penetration details]].
+
+## Sealant Joints at the EIFS {toc}
+
+### Sealant will not hold to bare insulation, and a finish coat can delaminate under sealant stress, so sealant at an EIFS joint is applied to the base coat over a back-wrapped edge. That sequencing requirement lands on the EIFS applicator rather than on the sealant trade: the edge has to be wrapped and base-coated before the sealant subcontractor arrives. {note}
+
+### A rigid bead buttered across a moving joint tears on the first significant cycle, so a movement joint is closed with backing and a bead proportioned to the movement rather than filled solid. {note}
+
+### Sealant joints at EIFS perimeters, openings, expansion joints, and penetrations shall be installed onto the base coat over a back-wrapped edge, and shall not be installed onto bare insulation or onto the finish coat alone.
+
+### Sealant joints in contact with the EIFS shall be installed with backing and joint geometry proportioned to the anticipated movement, as specified in [[sync/joint-sealants]] and [[sync/exterior-weather-sealants]].
+
+### The EIFS applicator shall complete the back-wrapping and base coat at every joint before the sealant work at that joint begins.
+
+### Adhesion of the sealant to the EIFS shall be verified as indicated in the datasheet.
+
+```datasheet
+label: Sealant Adhesion Verification
+type: radio
+options:
+ - "Laboratory adhesion test on project substrates before installation"
+ - "Field adhesion test on the installed work"
+ - "Laboratory adhesion test before installation and field adhesion test on the installed work"
+ - "Written confirmation of compatibility from the sealant and EIFS manufacturers without testing"
+```
+
+### The cost of adhesion testing and of replacing sealant that fails an adhesion test shall be borne by the Contractor.
+
+# Installation {toc}
+
+## The Contractor shall apply the EIFS in accordance with this standard, the approved shop drawings, ASTM C1397, the manufacturer's published instructions for the listed system, and the assembly configuration on which the project's flame propagation compliance relies.
+
+## Substrate and Water-Resistive Barrier Verification {toc}
+
+### Once the insulation and the lamina are on, the water-resistive barrier behind them cannot be reached without removing the EIFS, so the inspection regime is front-loaded into hold points rather than deferred to a punch list. A punch list cannot reach behind a finish coat. {note}
+
+### Before insulation is applied, the Contractor shall verify that the sheathing is sound, dry, flat within the specified tolerance, and securely fastened, that the water-resistive barrier and its accessory flashings are complete and continuous, and that every rough opening and penetration flashing behind the system is installed.
+
+### The completed water-resistive barrier shall be inspected and accepted before it is covered.
+
+### The applicator shall not cover a water-resistive barrier that is incomplete or that has not been accepted.
+
+### The Contractor shall give the Engineer of Record notice before concealing any portion of the water-resistive barrier, at the notice interval the Contract Documents establish.
+
+### Work concealed without the required inspection shall be uncovered for inspection at the Contractor's expense where the Engineer of Record directs.
+
+## Ambient and Substrate Conditions {toc}
+
+### The water-resistive barrier, adhesive, base coat, and finish are water-based and do not cure correctly below their minimum application temperature. The failure is invisible on the day of application and appears as a chalking finish, a weak base coat, or a lost bond weeks later. {note}
+
+### EIFS materials shall be applied only at and above the ambient and substrate temperature indicated in the datasheet, and only within the humidity and substrate moisture range the manufacturer publishes.
+
+```datasheet
+label: Minimum Application and Cure Temperature
+type: range
+unit: °F
+options:
+ min: 35
+ max: 50
+ setpoints: [35, 40, 45, 50]
+default: 40
+```
+
+### The ambient and substrate temperature shall be maintained at or above the minimum application temperature for not less than the period indicated in the datasheet after each coat is applied.
+
+```datasheet
+label: Minimum Period the Application Temperature Is Maintained After Application
+type: range
+unit: hours
+options:
+ min: 0
+ max: 96
+ setpoints: [0, 24, 48, 72, 96]
+```
+
+### Where no temperature maintenance period is indicated in the datasheet, the period the EIFS manufacturer publishes for the material and the ambient conditions shall govern, and that period shall be stated in the product data submittal.
+
+### EIFS materials shall not be applied to a frozen, frost-covered, or wet substrate.
+
+### Freshly applied materials shall be protected from rain, from freezing, and from direct sun and wind sufficient to flash the surface, until they have cured.
+
+### Each coat shall be allowed to cure for the period the manufacturer publishes before the next coat is applied.
+
+### Where work proceeds outside the manufacturer's published ambient conditions, the Contractor shall use the manufacturer's cold weather or hot weather materials and procedures and shall submit those procedures before that work begins.
+
+### The Contractor shall record the ambient temperature, the substrate temperature, and the substrate moisture condition at the start of each application and at each significant change in conditions.
+
+## Sequence and Coordination {toc}
+
+### The Contractor shall apply the system in the sequence established at the preinstallation conference.
+
+### The Contractor shall confirm that the flashings and rough opening seals that must precede the EIFS are installed and accepted before insulation is applied over them.
+
+### The Contractor shall confirm that the drainage path is continuous and unobstructed from the field of the wall to the weeps before the base coat is applied.
+
+### The Contractor shall protect the installed EIFS from physical damage and from contamination by following trades until the work is accepted.
+
+## Repair of Damaged Work {toc}
+
+### An EIFS is repairable, but only as the layered assembly it is: a skim coat over crushed insulation has no reinforcement under it and re-cracks along the same line. {note}
+
+### A field repair weathers differently from the surrounding wall and may remain faintly visible even where the color and texture are correctly matched, which is why the repair is cut back to a natural break where the elevation offers one. {note}
+
+### Damage to the cured EIFS shall be repaired with the manufacturer's materials and methods, cutting back to sound material and replacing the insulation where the insulation is damaged.
+
+### Repairs shall be re-laminated with mesh and base coat lapped onto sound surrounding lamina by not less than the lap width the manufacturer publishes, and refinished to match the adjacent texture and color.
+
+### Crushed or damaged insulation shall be cut out and replaced, and shall not be skimmed over with base coat.
+
+### Where the parties disagree whether a repair matches the accepted mockup, the Engineer of Record shall make the initial determination.
+
+# Field Quality Control {toc}
+
+## Field Water Testing {toc}
+
+### Field water testing finds the installation defects that no laboratory test of the listed system can reach: a missed back-wrap, an omitted end dam, an unsealed flashing lap, a sealant joint that never bonded. {note}
+
+### The nozzle method directs a calibrated spray along fixed, permanently sealed joints, and the chamber method applies water spray with a simultaneous air pressure differential across the specimen. The two are not interchangeable, because a joint that holds under spray alone can leak under pressure. {note}
+
+### Both methods are applied to fixed sealed joints rather than to drained and weeped base conditions, which are designed to admit water and discharge it and would report a leak that is the assembly working as intended. {note}
+
+### Field water testing shall be performed where the datasheet indicates it is required, and shall be scheduled early enough in the work that a defect found can be corrected in the same conditions elsewhere on the building.
+
+```datasheet
+label: Field Water Testing
+type: radio
+options:
+ - "Required"
+ - "Not required"
+```
+
+### Field water testing shall be performed by the method indicated in the datasheet.
+
+```datasheet
+label: Field Water Test Method
+type: radio
+options:
+ - "AAMA 501.2 nozzle method at fixed sealed joints"
+ - "ASTM E1105 chamber method at a static air pressure differential"
+ - "AAMA 501.2 nozzle method and ASTM E1105 chamber method"
+```
+
+### Field water testing shall be performed at not less than the number of locations indicated in the datasheet, distributed across the openings, terminations, and sealant joint conditions the approved test plan identifies.
+
+```datasheet
+label: Number of Field Water Test Locations
+type: range
+unit: locations
+options:
+ min: 0
+ max: 20
+ setpoints: [0, 1, 2, 3, 5, 8, 10, 15, 20]
+```
+
+### Where a field water test records leakage, the Contractor shall locate the source, repair it, and proceed as indicated in the datasheet.
+
+```datasheet
+label: Remedy Where a Field Water Test Records Leakage
+type: radio
+options:
+ - "Repair and re-test until the test is passed"
+ - "Repair and re-test once, then evaluate the condition without further re-test"
+ - "Repair without re-test"
+ - "Record the result without repair"
+default: "Repair and re-test until the test is passed"
+```
+
+### The cost of the repairs and of every re-test following a test that records leakage shall be borne by the Contractor.
+
+### The Contractor shall record the location, apparent cause, repair method, and re-test result for each condition tested, and shall include those records in the closeout submittals.
+
+## Moisture Survey Before Acceptance {toc}
+
+### Because the EIFS conceals the substrate, an elevated moisture reading is the only early indication that a flashing or a back-wrap is defective, and finding it before occupancy costs a repair rather than a reconstruction. {note}
+
+### A non-destructive moisture survey of the EIFS shall be performed before acceptance where the datasheet indicates it is required.
+
+```datasheet
+label: Moisture Survey Before Acceptance
+type: radio
+options:
+ - "Required across the full EIFS area"
+ - "Required at openings, terminations, and the lower wall"
+ - "Not required"
+```
+
+### The moisture survey shall record the instrument used, the reference reading established on known-dry construction, the survey grid or path, and every location whose reading exceeds the reference.
+
+### Where the survey records a reading above the reference, the Contractor shall determine the cause, shall repair the condition, and shall re-survey the affected area.
+
+### Where the parties disagree whether a recorded reading indicates concealed water entry, the Engineer of Record shall make the initial determination.
+
+# Delivery, Storage, and Handling {toc}
+
+## The water-based coatings, adhesives, base coats, and finishes are both freeze-sensitive and shelf-life-limited, and neither condition is apparent from the container. {note}
+
+## Insulation board degrades under prolonged ultraviolet exposure, which yellows and dusts the surface and destroys the bond the base coat depends on. {note}
+
+## Finish material of one color varies slightly between production batches, which reads on a large wall as visible banding between the areas each container covered. {note}
+
+## EIFS materials shall be delivered in the manufacturer's original sealed and labeled containers, with the lot number and the shelf-life expiration date legible.
+
+## EIFS materials shall be stored off the ground, under cover, and within the temperature range the manufacturer publishes for storage.
+
+## Material that has frozen or that is past its shelf-life expiration date shall be removed from the site and shall not be used.
+
+## Insulation board shall be stored flat, protected from sunlight, and protected from wind and physical damage.
+
+## Finish material of one color and texture shall be drawn from a single batch where the quantity permits, and containers shall be intermixed before application so that no batch line appears in the completed work.
+
+# Warranty {toc}
+
+## Contractor Installation Warranty {toc}
+
+### The Contractor shall warrant the EIFS installation against water entry attributable to defective terminations, back-wrapping, flashing interfaces, or sealant joints, against delamination, against cracking attributable to workmanship, and against defects in materials and workmanship, for the period indicated in the datasheet from the date of Substantial Completion.
+
+```datasheet
+label: Contractor Installation Warranty Period
+type: range
+unit: years
+options:
+ min: 1
+ max: 10
+ setpoints: [1, 2, 5, 10]
+default: 2
+```
+
+### The Contractor shall bear the cost of correcting moisture damage to the substrate and the wall assembly attributable to water entry through the installed EIFS during the warranty period, including the cost of removing and reinstalling the cladding, insulation, and finishes required to reach the defect.
+
+### Work repaired under warranty shall be warranted for a full warranty term running from the date of the repair, or for the unexpired remainder of the original term, whichever ends later.
+
+## Manufacturer System Warranty {toc}
+
+### A manufacturer system warranty covers the matched component set rather than any one product, and it is conditioned on the certified applicator, the unmixed component set, and the documented field visits. Those conditions are satisfied or missed during construction and verified only at claim time. {note}
+
+### The Contractor shall provide the EIFS manufacturer's system warranty covering the matched components of the listed system for the period indicated in the datasheet.
+
+```datasheet
+label: Manufacturer System Warranty Period
+type: range
+unit: years
+options:
+ min: 5
+ max: 20
+ setpoints: [5, 10, 15, 20]
+```
+
+### Where no manufacturer system warranty period is indicated in the datasheet, the period the EIFS manufacturer offers for the specified system shall govern, and that period shall be stated in the product data submittal.
+
+### The Contractor shall satisfy every condition on which the manufacturer system warranty depends and shall submit the manufacturer's written confirmation that those conditions have been met.
+
+# Spare Finish Material {toc}
+
+## A custom color may be unavailable years later and will not match across a batch change, so material set aside from the installed batches is what makes a future repair invisible. {note}
+
+## The Contractor shall deliver to the Owner spare finish material of each installed color and texture, in the manufacturer's sealed containers, in not less than the quantity indicated in the datasheet.
+
+```datasheet
+label: Spare Finish Material Quantity per Color and Texture
+type: range
+unit: gal
+options:
+ min: 0
+ max: 50
+ setpoints: [0, 1, 5, 10, 20, 50]
+```
+
+## The Contractor shall record the batch numbers of the installed finish for each color and texture and shall provide those records to the Owner.