Exterior Insulation and Finish Systems (EIFS)
Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
Showing changes from Rev 6
to Rev 7
in Exterior Insulation and Finish Systems (EIFS).
---
title: Exterior Insulation and Finish Systems (EIFS)
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- 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
…12 unchanged lines
default: "Complete EIFS product data (single matched system; WRB, drainage, board, base/mesh, finish)"
```
−
−### The Contractor shall submit the action submittals listed for this standard for the Engineer's review and return before procurement and application.
### 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.
…10 unchanged lines
- 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
…9 unchanged lines
```
−### At substantial completion, the Contractor shall provide the closeout submittals listed for this standard before the EIFS work is accepted.
−
# Quality Assurance {toc}
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### 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)
…5 unchanged lines
default: "Elevated exposure — lower walls within ~8 ft of grade, pedestrian areas, exposed corners"
```
−
−### The base-coat-and-mesh assembly shall be selected for the impact exposure of each wall area.
### Wall areas within reach of grade or of pedestrian and vehicle traffic shall receive the heavier impact mesh class required for that exposure.
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#### 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
…5 unchanged lines
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
…6 unchanged lines
```
−#### 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.
−#### 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.
−
### 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
…6 unchanged lines
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
…8 unchanged lines
```
−#### 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.
−#### 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.
−
## Structural Performance Under Wind Load {toc}
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### 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
…7 unchanged lines
default: 0.064
```
−
−### 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.
### The insulation thickness shall be set to meet the assembly U-factor for the climate zone.
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#### 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
…5 unchanged lines
default: "Required — combustible EPS on Type I-IV construction; passing NFPA 285 test of the as-built assembly (standard)"
```
−
−#### 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.
#### 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.
…4 unchanged lines
#### 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)
…3 unchanged lines
default: "Flame-spread ≤ 25 and smoke-developed ≤ 450 (Class A; required for foam plastic per IBC 2603)"
```
−
−#### 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.
#### The foam-plastic insulation shall comply with the applicable provisions of IBC Section 2603, including the required thermal-barrier separation from the interior.
…6 unchanged lines
### 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
…6 unchanged lines
default: "Glass-mat gypsum sheathing — ASTM C1177 (standard for framed walls)"
```
−
−### 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.
### The substrate shall be the one for which the system's wind-load, drainage, and fire data were developed.
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### 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
…4 unchanged lines
default: "Aged per ASTM E2430 minimum (standard) — board dimensionally stable before installation"
```
−
−### 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.
### The board shall be cut square, flat, and to the required thickness.
### Damaged or warped boards shall not be used.
…3 unchanged lines
### 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
…10 unchanged lines
default: "2 in"
```
−
−### The EPS board thickness shall be as required to meet the assembly thermal requirement.
### 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.
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### 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
…5 unchanged lines
default: "Adhesive (ribbon/notched) bedded to the WRB, forming drainage channels (standard for drainage EIFS)"
```
−
−### 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.
### 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.
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### 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
…5 unchanged lines
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
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```
−### 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.
−### The texture and color shall be selected from the manufacturer's range and confirmed on the mockup.
−
## 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)
…4 unchanged lines
default: "At or above the manufacturer's minimum LRV for standard EPS EIFS (standard)"
```
−
−### 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.
### Where a dark color below the standard minimum LRV is required, a finish and EPS specifically listed for low-LRV use shall be specified.
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### 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
…3 unchanged lines
default: "All EIFS edges fully back-wrapped (mesh and base coat wrapped onto substrate) — mandatory (standard)"
```
−
−### 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.
### 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.
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### 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
…4 unchanged lines
default: "Sealant to base coat over a back-wrapped edge, with backer rod (mandatory; submit adhesion data)"
```
−
−### 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.
### 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.
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### 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)
…5 unchanged lines
default: "Required at representative openings, terminations, and joints; repair and re-test until passing (recommended)"
```
−
−### 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.
### Any leakage shall be located, repaired, and re-tested.
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### 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
…5 unchanged lines
```
−### 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.
−
# Installation {toc}
−## General {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.
−### 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}
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## 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.