Finish Carpentry
Remake batch 22: rewritten from scratch under the authoring cheatsheet with datasheet constraints; scope boundaries restated against the remade neighbors
Showing changes from Rev 2
to Rev 3
in Finish Carpentry.
---
title: Finish Carpentry
category: Architectural
−toc_depth: 3
description: >
− When to use: field installation of pre-manufactured interior running and standing
− trim and standard stock millwork that needs no custom shop drawings - base, casing,
− crown, chair rail, wainscot cap, picture rail, stool and apron, bed mold, and similar
− off-the-shelf wood, MDF, finger-jointed, or cellular-PVC profiles. Covers setting
− conditions, acclimation, layout, fitting, fastening, and joinery for commercial,
− multi-family, hospitality, healthcare, institutional, and government interior fit-out.
− Not intended for: custom shop-fabricated casework and built-ins (use
− [[sync/wood-and-laminate-casework]]); architectural wood paneling and wainscot
− panel systems (use [[sync/architectural-wood-trim-and-paneling]]); structural
− framing, blocking, and rough bucks (use [[sync/rough-carpentry]] and
− [[sync/wood-framing]]); field painting, staining, and clear-coating of installed
− trim (use [[sync/interior-painting]]); exterior millwork and trim; and custom
− millwork requiring shop drawings.
+ When to use: Field-installed interior finish carpentry built from stock lumber and stock catalog moldings that are set without shop drawings: base, shoe, casing, jamb extensions, chair rail, crown, picture mold, stool and apron, and other standing and running trim in solid wood, finger-jointed wood, medium density fiberboard, cellular PVC, and foam plastic; stock closet shelving and closet rod; stock wood stair treads, risers, skirtboards, handrails, newels, and balusters set on a stair framed by others; and the field installation, where it is finish carpentry, of items furnished by the Owner or under other standards. Covers the installation grade under ANSI/AWI 0620, species and lumber grade under the hardwood and softwood grading rules, molding grade, finish type and delivery state, moisture content and interior conditions, interior finish fire classification, composite-wood formaldehyde compliance, blocking verification, joinery, fastening, scribing and fitting, delivery and storage, warranty, and attic stock.
+ Not intended for: Custom architectural woodwork milled to a project profile or fabricated in a shop to shop drawings, including standing and running trim and wall paneling at an architectural woodwork grade (see [[sync/architectural-wood-trim-and-paneling]]); factory-fabricated casework, built-in cabinetry, and countertops (see [[sync/wood-and-laminate-casework]]); a millwork package that combines several woodwork types under one contract (see [[sync/interior-architectural-woodwork]]); wood door leaves (see [[sync/wood-doors]]) and openings bought as one package of door, frame, and hardware (see [[sync/doors-frames-and-hardware]]); structural wood framing, including stair stringers and carriages (see [[sync/wood-framing]]); non-structural blocking, backing, grounds, and furring (see [[sync/rough-carpentry]]); field painting, staining, and clear finishing of installed trim, and the filling of fastener holes in painted trim (see [[sync/interior-painting]]); wood finish flooring (see [[sync/wood-flooring]]); resilient wall base (see [[sync/resilient-flooring]]); metal stairs and railings (see [[sync/metal-stairs-and-railings]]); and exterior trim, siding, and soffits exposed to the weather.
---
# Scope {toc}
−## This standard governs the field installation of pre-manufactured interior running and standing trim and standard stock millwork that is selected from a manufacturer's catalog and requires no custom shop drawings.
+## This standard covers the furnishing and field installation of interior finish carpentry built from stock material: standing and running trim from stock lumber and stock catalog moldings, jamb extensions and casing at door and window openings, stock closet shelving and rod, stock wood stair parts, and the field installation of items furnished by others where that installation is finish carpentry. {note}
−### Finish carpentry is the trade that sets the visible wood trim a building's occupants touch and stand next to every day - the base where wall meets floor, the casing that frames a door, the crown that caps a room. {note}
+## Finish carpentry is the woodwork that is bought from a lumber yard or a molding catalog and made to fit in the room: the base where the wall meets the floor, the casing around a door, the crown at the ceiling, the shelf and rod in a closet. It is judged at arm's length on the fit of its joints, so a gap that would be invisible in framing is a defect here. {note}
−### Because these elements are seen at close range and at eye level, the work is judged by joinery and fit, not by structural capacity; a 1/16 inch gap that would be invisible in framing is a punch-list item here. {note}
+## Three standards divide interior woodwork, and the test that routes an item between them is how the item is made, not what it is called: {note}
−### The distinction that organizes this whole section is "stock versus custom." Stock trim is pulled from a catalog by profile number and installed in the field. Custom millwork is drawn, shop-fabricated to a specific design, and delivered as a finished assembly. This standard covers only the former. {note}
+- Stock profile, field-cut and field-assembled from catalog moldings and lumber, with no shop drawing: finish carpentry, under this standard
+- Custom profile milled to a project drawing, or trim and paneling fabricated in a shop to shop drawings at an architectural woodwork grade: [[sync/architectural-wood-trim-and-paneling]]
+- Cabinets, counters, and built-ins fabricated in a shop as boxes: [[sync/wood-and-laminate-casework]]
+- Several of those types bought together under one millwork contract: [[sync/interior-architectural-woodwork]], which coordinates the package and hands each stock item back to this standard
−### Work of this section includes setting and conditioning the space, acclimating material to the in-service environment, layout, cutting and coping, fitting, fastening, and joinery of trim at walls, ceilings, floors, and door and window openings.
+## A base molding run against a wall is finish carpentry whether the room is a corridor or a boardroom; the same base becomes architectural woodwork the moment its profile is drawn for the project and run by a millwork shop. The grade language follows the route: architectural woodwork carries an AWI, WI, or AWMAC product grade, and stock trim carries a species, a lumber grade under the hardwood or softwood grading rules, a molding grade, a moisture content, and a profile number. {note}
−### Work of this section includes solid lumber, MDF and HDF, finger-jointed, and cellular-PVC profiles in raw, pre-primed, and pre-finished states.
+## The following are outside this standard: {note}
−### A complete finish-carpentry specification cites two complementary AWI documents, not one: ANSI/AWI 0620 governs the installation - the field tolerances, fit, and workmanship - while ANSI/AWI 0622.0646 governs the millwork and trim products themselves. Referencing only one leaves either the product or the installation undefined. {note}
+- Wood door leaves, which are governed by [[sync/wood-doors]], and wood door frames and jambs, which are furnished by the trade that supplies the door and are not covered here; this standard furnishes the jamb extensions and the casing that trim the opening
+- Structural framing, including the stringers and carriages a stair is built on ([[sync/wood-framing]])
+- Non-structural blocking, backing, grounds, and furring, which are installed before the wall is closed ([[sync/rough-carpentry]]), and the in-wall blocking that a steel-stud partition carries ([[sync/gypsum-board-assemblies]])
+- Field painting, staining, and clear finishing of the installed trim, and the filling of fastener holes in trim that receives an opaque finish ([[sync/interior-painting]])
+- Wood finish flooring and its expansion base at the wall ([[sync/wood-flooring]]), and resilient wall base ([[sync/resilient-flooring]])
+- Metal stairs, handrails, and guards ([[sync/metal-stairs-and-railings]])
+- Exterior trim, siding, soffits, and any woodwork exposed to the weather
−## The following related work is performed under other standards and is excluded here.
+## The extent, location, and profile designation of each trim element shall be as indicated on [[drawing: the trim schedule, interior elevations, and interior details]].
−### Custom shop-fabricated casework, cabinets, and built-ins are excluded; specify them under [[sync/wood-and-laminate-casework]]. {note}
+## The location, length, and depth of closet shelving and rod shall be as indicated on [[drawing: the floor plans and interior elevations]].
−### Architectural wood paneling systems, wainscot panel assemblies, and wall panel systems are excluded; specify them under [[sync/architectural-wood-trim-and-paneling]]. {note}
+## The Contractor shall coordinate this work with [[sync/rough-carpentry]] and [[sync/gypsum-board-assemblies]] for the blocking and backing this trim is fastened to.
−### Structural framing, in-wall blocking, backing, and rough door bucks are excluded; specify them under [[sync/rough-carpentry]] and [[sync/wood-framing]]. The presence and location of that backing is, however, a prerequisite this section depends on and verifies. {note}
+## The Contractor shall coordinate this work with [[sync/wood-doors]] and [[sync/doors-frames-and-hardware]] at every opening that receives casing or a jamb extension.
−### Field painting, staining, and clear-coat finishing of installed trim is excluded; specify it under [[sync/interior-painting]]. This section delivers the substrate; finishing is a separate trade scope that must be sequenced against it. {note}
+## The Contractor shall coordinate this work with [[sync/interior-painting]] for the sequence of priming, filling, caulking, and finishing against the setting of trim.
−### Exterior millwork, exterior trim, and exterior cladding are excluded as outside the interior fit-out focus of this section. {note}
+## The Contractor shall coordinate this work with [[sync/wood-flooring]] and [[sync/resilient-flooring]] at the base line, so that the base and shoe cover the flooring expansion gap without restraining the floor.
−### Custom millwork that requires shop drawings, project-specific profiles, or architectural-woodwork fabrication is excluded; that work is architectural woodwork, not finish carpentry, and is specified under [[sync/architectural-wood-trim-and-paneling]] or a dedicated casework section. {note}
−
# Referenced Standards {toc}
−## Material, fabrication, and installation shall comply with the latest adopted edition of each of the following unless a specific edition is cited.
+## Materials and installation shall comply with the latest adopted edition of each of the following unless a specific edition is cited.
−## Where referenced standards conflict, the more stringent requirement shall govern unless the Engineer of Record or Architect directs otherwise in writing.
+## Where referenced standards conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.
| Standard | Title |
|----------|-------|
−| ANSI/AWI 0620-2024 | Finish Carpentry/Installation |
−| ANSI/AWI 0622.0646-2024 | Millwork and Wood Trim |
−| UFGS 06 20 00 | Finish Carpentry (Unified Facilities Guide Specification) |
−| NHLA Grading Rules | Rules for the Measurement and Inspection of Hardwood and Cypress |
+| ANSI/AWI 0620 | Finish Carpentry/Installation |
+| NHLA Rules | Rules for the Measurement and Inspection of Hardwood and Cypress |
+| WWPA | Western Lumber Grading Rules |
| PS 20 | American Softwood Lumber Standard |
−| WDMA I.S.1-A | Architectural Wood Flush Doors |
−| IBC | International Building Code (Chapter 8, Interior Finishes) |
−| IFC | International Fire Code (interior trim provisions) |
+| WMMPA WM Series | Wood Moulding Profiles and Quality Grades (Wood Moulding and Millwork Producers Association) |
+| ANSI A208.2 | Medium Density Fiberboard (MDF) for Interior Applications |
+| ASTM D4444 | Laboratory Standardization and Calibration of Hand-Held Moisture Meters |
| ASTM E84 | Surface Burning Characteristics of Building Materials |
−| NAAWS 4.0 | North American Architectural Woodwork Standards (AWI / Woodwork Institute) |
+| UL 723 | Test for Surface Burning Characteristics of Building Materials |
+| 40 CFR Part 770 | Formaldehyde Standards for Composite Wood Products (TSCA Title VI) |
+| CARB ATCM 93120 | Airborne Toxic Control Measure to Reduce Formaldehyde Emissions from Composite Wood Products |
+| IBC | International Building Code (Chapter 8, Interior Finishes; Chapter 10, Means of Egress; Chapter 16, Structural Design) |
−### NAAWS 4.0, published jointly by AWI and the Woodwork Institute, is a parallel installation and quality document used in Canada and parts of the western United States; where a project specifies NAAWS in lieu of ANSI/AWI 0620, the equivalent NAAWS grade and tolerance provisions govern. {note}
−
# Submittals {toc}
−## The Contractor shall make the submittals specified below before fabrication, ordering, or delivery of any trim covered by this section.
+## Action Submittals {toc}
−### A cut-sheet submittal is required even for stock profiles. A catalog photo is not a submittal; the package must pin species, profile, moisture content, finish state, and grade so the installed product can be verified against what was approved and substitution disputes are closed before they start. {note}
+### The Contractor shall submit the following for the Engineer of Record's review, and shall not order material for an item until that item's submittals have been reviewed and returned:
−## Action Submittals
+- **Product Data:** For each trim, shelving, and stair element: the species or material, the lumber grade and molding grade, the profile designation and a dimensioned profile section from the manufacturer's catalog, the stock lengths, the moisture content at shipment, the finish type, and the delivery state.
+- **Samples:** A 12 in. length of each profile in the specified material and delivery state, and for transparent-finished trim a sample of each species showing the grade and the color range the supplier will furnish.
+- **Fastener and Adhesive Schedule:** The fastener type, size, and finish and the adhesive type for each trim material and each substrate it is fastened to.
+- **Installation Instructions:** The manufacturer's published installation instructions for cellular PVC trim, foam plastic trim, and any item with a proprietary clip or fastening system.
−### The Contractor shall submit the following action submittals for review and approval before ordering material:
−
−- Product data for each trim type: species or material, profile designation and dimensioned profile drawing, nominal sizes, and surface state (raw, pre-primed, or pre-finished)
−- Declared AWI installation grade (Economy, Custom, or Premium) for the work, with the corresponding tolerance and defect provisions
−- Samples of each profile in the specified species and finish state, minimum 12 inch length, including representative inside and outside corner joinery
−- Fastener schedule identifying fastener type, size, and finish for each trim type and substrate condition
−- Moisture content certification for solid-lumber profiles, stating moisture content at the time of shipment
−- For pre-finished profiles, a finished sample showing color, sheen, and any field touch-up provisions
−
```datasheet
−label: Action submittals required
+label: Action Submittals Required
type: checkbox
options:
− - Product data (species/material, profile, sizes, surface state)
− - Declared AWI installation grade
− - Profile samples, 12 inch minimum
− - Fastener schedule
− - Moisture content certification (solid lumber)
− - Pre-finished color/sheen sample
−default:
− - Product data (species/material, profile, sizes, surface state)
− - Declared AWI installation grade
− - Profile samples, 12 inch minimum
− - Fastener schedule
− - Moisture content certification (solid lumber)
+ - "Product data with species, grade, profile section, moisture content, finish type, and delivery state"
+ - "Profile and species samples"
+ - "Fastener and adhesive schedule"
+ - "Manufacturer's installation instructions for non-wood and clip-fastened trim"
+default: ["Product data with species, grade, profile section, moisture content, finish type, and delivery state", "Profile and species samples", "Fastener and adhesive schedule"]
+constraint: all_of
```
−## Informational Submittals
+#### Shop drawings are not a submittal under this standard. A profile that needs a shop drawing to be understood is not a stock profile, and the item belongs under [[sync/architectural-wood-trim-and-paneling]]. The product data substitute for the shop drawing is the catalog section, which fixes the profile by number so that the installed piece can be checked against what was reviewed. {note}
−### The Contractor shall submit the following informational submittals before installation begins:
+## Informational Submittals {toc}
−- Acclimation record documenting in-place storage location, ambient temperature and relative humidity, and the acclimation period achieved before installation
−- Space-conditioning verification confirming the building is conditioned to the specified temperature and humidity range and that HVAC is operating
−- Manufacturer's installation instructions for any profile with proprietary fastening, clip, or adhesive requirements
−- Flame-spread and smoke-developed classification data (ASTM E84 / IBC 803) for each trim material in occupancies that regulate trim
+### The Contractor shall submit the following for record before the corresponding work begins:
+- **Moisture and Conditioning Record:** The interior temperature and relative humidity readings and the wood moisture content readings taken at delivery, at the end of acclimatization, and at the completion of installation.
+- **Fire-Test Documentation:** The ASTM E84 or UL 723 report for each trim material at a location where the trim is regulated as an interior finish, and the evaluation report for foam plastic trim.
+- **Formaldehyde Compliance Documentation:** Certification or labeling establishing compliance of every composite-wood component with 40 CFR Part 770 and CARB ATCM 93120 at the level identified in the datasheet.
+
```datasheet
−label: Informational submittals required
+label: Informational Submittals Required
type: checkbox
options:
− - Acclimation record
− - Space-conditioning verification
− - Manufacturer installation instructions
− - Flame-spread / smoke-developed classification data
−default:
− - Acclimation record
− - Space-conditioning verification
− - Flame-spread / smoke-developed classification data
+ - "Moisture content and interior conditioning record"
+ - "Fire-test reports and foam plastic evaluation report"
+ - "Composite-wood formaldehyde compliance documentation"
+default: ["Moisture content and interior conditioning record", "Composite-wood formaldehyde compliance documentation"]
+constraint: all_of
```
−## Closeout Submittals
+## Closeout Submittals {toc}
−### The Contractor shall submit the following closeout submittals before final acceptance:
+### The Contractor shall submit the following at Substantial Completion:
−- Touch-up and field-repair materials for pre-finished profiles: filler, putty, and finish keyed to each species and color used
−- Maintenance data describing recommended cleaning methods for the installed trim materials
+- **Attic Stock Inventory:** A written inventory of the attic stock delivered, identifying each item by profile designation, species or material, delivery state, and length, and its storage location.
+- **Filler and Touch-Up Record:** The color-matched filler and touch-up material used on transparent-finished trim, identified by product and color.
+- **Warranty Documentation:** The executed installation warranty required by this standard.
```datasheet
−label: Closeout submittals required
+label: Closeout Submittals Required
type: checkbox
options:
− - Touch-up / field-repair materials (pre-finished profiles)
− - Maintenance and cleaning data
−default:
− - Maintenance and cleaning data
+ - "Attic stock inventory by profile, material, delivery state, and length"
+ - "Color-matched filler and touch-up record"
+ - "Executed installation warranty"
+default: ["Attic stock inventory by profile, material, delivery state, and length", "Executed installation warranty"]
+constraint: all_of
```
# Quality Assurance {toc}
−## The AWI installation grade is the single most consequential decision in this section, and it shall be declared explicitly.
+## Installer Qualifications {toc}
−### AWI 0620 defines three installation grades - Economy, Custom, and Premium - and each grade sets a different bar for allowable tolerances, permitted natural and machining defects, and finish appearance. The grades are not vague adjectives; they are a defined system the installer is held to. {note}
+### The installer shall be a firm regularly engaged in finish carpentry of the type and grade specified, and shall submit a list of at least three completed projects of comparable scope.
−### Failing to declare a grade is the classic source of finish disputes. With no grade stated, an installer reasonably defaults to economy-level fit, and the resulting gaps and offsets surface at substantial completion when they are most expensive to argue about. State the grade up front and the standard of care is settled before the first piece is cut. {note}
+### Trim of one profile within a related area of the project shall be furnished from a single manufacturer's catalog.
−### Custom grade is the appropriate default for roughly four of five commercial, multi-family, institutional, and government fit-out projects; it delivers a tight, professional appearance without the cost premium of Premium-grade joinery and material selection. {note}
+#### Two manufacturers' versions of the same nominal profile differ by a few thousandths of an inch in width and in the radius of the curves, and the difference shows at every joint between them. One catalog per profile per area is what keeps a run continuous. {note}
−### The installer shall be a firm regularly engaged in finish carpentry of the type and grade specified, with experience on projects of comparable scope.
+## Installation Grade {toc}
+### The installation grade under ANSI/AWI 0620 shall be as indicated in the datasheet.
+
```datasheet
−label: AWI installation grade
+label: Installation Grade
type: radio
options:
− - Economy
− - Custom
− - Premium
−default: Custom
+ - "Economy"
+ - "Custom"
+ - "Premium"
+default: "Custom"
```
−## Field conditions shall be verified before work begins.
+### Installed work shall meet the tolerances of ANSI/AWI 0620 for the specified installation grade for plumb, level, flatness of plane, joint tightness, reveal uniformity, and fastener concealment.
−### The installer shall verify that required in-wall blocking and backing are present and correctly located before installing any trim that depends on it - chair rail, crown nailers, wainscot cap, and tall base.
+### Where the Contractor and the Engineer of Record disagree whether an observed condition is within the specified grade tolerance, the Engineer of Record shall make the initial determination by measurement against the ANSI/AWI 0620 requirement for the grade.
−### The installer shall verify that wall, ceiling, and floor substrates are within the flatness and plumb tolerances needed to achieve the specified installation grade, and shall report nonconforming substrate conditions before proceeding.
+#### The installation grade is the one AWI grade that applies to stock trim. It governs the erected result rather than the material: how tight a joint closes, how uniform a reveal runs, how far a run can be out of plumb over its length, and whether a fastener can show. Under the AWI standards Custom Grade applies where the Contract Documents name no grade, so a project that is silent on grade has already selected Custom. Premium tightens every tolerance at a labor cost that is visible where trim is viewed closely in good light; Economy loosens them where the trim is in a back-of-house room or is painted and seen from a distance. {note}
−### Discovering absent backing after the wall is closed is one of the most common and most avoidable delays in this trade; the verification clause above exists precisely so that the missing-blocking RFI is raised while it can still be fixed cheaply rather than at trim-out. {note}
+## Mockup {toc}
−# Environmental and Service Conditions {toc}
+### Whether a trim mockup is required shall be as indicated in the datasheet.
−## Wood and wood-composite trim moves with moisture, and controlling that movement is the governing performance concern of this section.
+```datasheet
+label: Trim Mockup Required
+type: radio
+options:
+ - "Required"
+ - "Not required"
+```
−### Wood is hygroscopic: it gives up and takes on moisture until it reaches equilibrium with the surrounding air, swelling and shrinking across the grain as it does. Trim installed wet shrinks and opens joints; trim installed dry in a humid season swells and buckles. The defenses are correct moisture content at installation and a properly conditioned space - calendar days alone are not the requirement. {note}
+### Where a mockup is required, it shall be a short run of each profile carrying an inside corner, an outside corner, a running joint, and a casing head joint, built with the specified material and delivery state, at a location the Engineer of Record designates.
−### The single most damaging field error is installing trim before the building is fully conditioned. Acclimation language that cites only a number of days, with the HVAC off and the slab still releasing moisture, guarantees joint gaps and nail pops after occupancy. Acclimation is to the in-service condition, not to the jobsite as found. {note}
+### The Contractor shall obtain the Engineer of Record's written acceptance of a required mockup before setting the corresponding trim elsewhere.
−## Moisture content at installation shall be within the range specified for the project's climate.
+### An accepted mockup shall establish the standard of quality for the corresponding work and may remain in the finished work if it is undamaged and in a location shown to receive that work.
−### Solid-lumber and engineered trim shall be installed at a moisture content appropriate to the in-service climate: nominally 6-9% in heated interior spaces, with 6% in arid and desert climates and 9-11% acceptable in humid coastal climates.
+#### A mockup settles the coped and mitered joints, the reveal, and the delivery state before the first full room is trimmed, when a rejected corner costs one piece. It is worth its cost on transparent-finished work and on Premium Grade work, and buys little on painted base and casing at Custom Grade. {note}
−### The installer shall verify moisture content of solid-lumber trim with a calibrated moisture meter before installation and shall not install material outside the specified range.
+# Interior Conditions and Wood Moisture Content {toc}
+## Building Readiness Before Delivery {toc}
+
+### Trim, shelving, and stair parts shall not be delivered to the building until the building is enclosed and weather-tight.
+
+### Trim, shelving, and stair parts shall not be delivered to the building until concrete, masonry, plaster, and gypsum board finishing operations in the receiving space are complete and the affected construction is dry.
+
+### Trim, shelving, and stair parts shall not be delivered to the building until interior temperature and relative humidity are being held within the ranges indicated in the datasheet.
+
+### The source of interior conditioning before and during delivery, acclimatization, and installation shall be as indicated in the datasheet.
+
```datasheet
−label: Target moisture content at installation
+label: Interior Conditioning Source Before and During Installation
+type: radio
+options:
+ - "Permanent HVAC system in operation"
+ - "Temporary conditioning maintaining the specified humidity range"
+ - "Either, at the Contractor's option, provided the specified range is maintained and recorded"
+```
+
+#### Wood is hygroscopic: it exchanges moisture with the surrounding air until it reaches equilibrium and changes dimension across the grain as it does. Trim set before the building's service condition is established shrinks and opens its joints, or swells and buckles, once that condition arrives. A slab that is still drying and a construction heater that burns fuel inside the space both load the air with moisture, and a count of calendar days does nothing about either. {note}
+
+#### A permanent HVAC system holds the actual service condition the trim will live in; temporary conditioning can hold the same numbers but is removed at some point before occupancy, so the recorded humidity log is the only evidence that the range was continuous. {note}
+
+## Service Relative Humidity Range {toc}
+
+### The minimum and maximum interior relative humidity to be maintained at delivery, during installation, and in service shall be as indicated in the datasheet.
+
+```datasheet
+label: Lowest Interior Relative Humidity in Service
type: range
−unit: "%"
−min: 6
−max: 11
−step: 1
−default: 8
+unit: '% RH'
+options:
+ min: 15
+ max: 50
+ step: 5
+constraint: min
```
```datasheet
−label: Climate zone basis for moisture content
−type: radio
+label: Highest Interior Relative Humidity in Service
+type: range
+unit: '% RH'
options:
− - Arid / desert (target 6%)
− - Interior heated, general US (target 8%)
− - Humid coastal (target 9-11%)
−default: Interior heated, general US (target 8%)
+ min: 45
+ max: 75
+ step: 5
+constraint: max
```
−## Material shall be acclimated to the conditioned space before installation.
+#### The humidity range that suits wood trim is regional. Across most of the United States and Canada an interior range near 25% to 55% RH corresponds to the moisture content stock moldings are kiln-dried to; the damp southern coastal region runs higher, near 43% to 70% RH, and the dry southwestern United States and the Canadian prairie provinces run lower, near 20% to 50% RH. A range written for another region produces trim that opens its joints while meeting every material requirement. {note}
−### Trim shall be acclimated in the conditioned installation space, at the in-service temperature and humidity, for not less than 48 hours before installation.
+## Wood Moisture Content at Delivery {toc}
−### Solid lumber 3/4 inch thick or greater shall be acclimated for not less than 72 hours, and not less than 96 hours where job conditions or material thickness warrant the additional period.
+### The minimum and maximum moisture content of solid and finger-jointed wood trim, shelving, and stair parts at delivery and at installation shall be as indicated in the datasheet.
```datasheet
−label: Minimum acclimation period
−type: radio
+label: Lowest Wood Moisture Content at Delivery
+type: range
+unit: '%'
options:
− - 48 hours (primed MDF and finger-jointed profiles)
− - 72 hours (solid lumber 3/4 inch and greater)
− - 96 hours (thick solid lumber, adverse conditions)
−default: 48 hours (primed MDF and finger-jointed profiles)
+ min: 3
+ max: 10
+ step: 1
+constraint: min
```
−## The installation space shall be conditioned before, during, and after installation.
+```datasheet
+label: Highest Wood Moisture Content at Delivery
+type: range
+unit: '%'
+options:
+ min: 6
+ max: 15
+ step: 1
+constraint: max
+```
−### The space shall be maintained between 60°F and 80°F (16°C to 27°C) and between 25% and 55% relative humidity for not less than 10 days before installation, and continuously during and after installation.
+### The Contractor shall measure and record the moisture content of a representative sample of each species and product on arrival at the site with a hand-held meter calibrated under ASTM D4444 for the species, and shall report a reading outside the specified range to the Engineer of Record before the material is installed.
−### HVAC serving the space shall be operating and shall remain in operation; trim shall not be installed in an unconditioned or temporarily heated space relying on construction heaters that introduce combustion moisture.
+### Where the Contractor and the Engineer of Record disagree whether a reading is representative, the Engineer of Record shall make the initial determination and may direct additional readings at the Contractor's cost.
+#### Moisture content and the service humidity range are two views of one equilibrium. Across most of the United States and Canada a 25% to 55% RH service range corresponds to roughly 5% to 10% moisture content; the damp southern coastal region corresponds to roughly 8% to 13%, and the dry southwest and prairie provinces to roughly 4% to 9%. Stock moldings leave the mill near the middle of the general range, so the delivered reading is normally inside it unless the material was stored wet on the way. {note}
+
+#### Framing lumber is dried to a far higher moisture content than finish material and is not interchangeable with it, even for a concealed cleat or a nailer inside a closet. A meter reading on a resin-dense species, on MDF, or on cellular PVC is not a wood moisture reading, and only solid and finger-jointed wood is measured under this article. {note}
+
+## Acclimatization Before Installation {toc}
+
+### The minimum period material is held in the conditioned space before installation begins shall be as indicated in the datasheet.
+
```datasheet
−label: Space temperature range during install
+label: Acclimatization Period in the Conditioned Space
type: range
−unit: "°F"
−min: 60
−max: 80
−step: 1
−setpoints:
− - 60
− - 70
− - 80
−default: 70
+unit: hours
+options:
+ min: 0
+ max: 168
+ setpoints: [0, 24, 48, 72, 96, 120, 168]
+constraint: min
```
+### The Contractor shall stack acclimatizing material flat, fully supported, and stickered so air circulates around every piece.
+
+### The Contractor shall verify by moisture reading that wood material is within the specified moisture content range before installation begins, regardless of the elapsed acclimatization period.
+
+#### The elapsed period is a scheduling commitment; the moisture reading is the acceptance criterion. Material that arrives already at equilibrium needs no waiting period, and material that arrives far off equilibrium will not reach it in a fixed number of hours, which is why a period of zero is a legitimate selection when readings govern. Medium density fiberboard and cellular PVC carry no wood moisture reading and are acclimatized for the period alone, PVC so that it is cut at the temperature it will serve at. {note}
+
+# Work Elements {toc}
+
+## The finish carpentry elements included in the work shall be as indicated in the datasheet, in the extent the drawings show.
+
```datasheet
−label: Space relative humidity range during install
−type: range
−unit: "%"
−min: 25
−max: 55
−step: 5
−default: 40
+label: Finish Carpentry Elements Included
+type: checkbox
+options:
+ - "Base and shoe"
+ - "Door casing and jamb extensions"
+ - "Window casing, stool, and apron"
+ - "Chair rail"
+ - "Crown and bed mold"
+ - "Picture mold"
+ - "Closet shelving and rod"
+ - "Stock wood stair parts"
+ - "Field installation of items furnished by others"
+default: ["Base and shoe", "Door casing and jamb extensions"]
+constraint: all_of
```
−# Trim material shall be selected for the application, and the material choice carries real consequences for moisture tolerance, appearance, and cost.
+## Where an element is included, every occurrence of it that the drawings show shall be furnished and installed under this standard unless the drawings assign a specific occurrence to another standard.
−## There is no single best trim material; each common option trades cost, dimensional stability, paintability, and moisture tolerance differently. The right choice depends on whether the trim is painted or stained, whether it sees moisture, and the project's budget and grade. {note}
+### Base and door casing appear on nearly every project that carries this standard, and the rest follow the design: a chair rail where walls are protected or divided, a crown where the room is finished to a ceiling line, a picture mold where art is hung, a stool and apron at a wood-trimmed window. The checklist is what tells a bidder which items are priced here rather than under the millwork or casework package. {note}
−## Paint-grade MDF is the workhorse of commercial and multi-family fit-out - dimensionally stable, dead flat, with crisp molded profiles and a factory-primed surface that paints beautifully. Its one disqualifying weakness is moisture: MDF swells irreversibly when wetted and must never be used in wet or periodically damp areas. {note}
+# Trim Materials {toc}
−## Finger-jointed primed pine is the cost-effective solid-wood choice for high-volume painted work; short clear blocks are joined into long lengths, then primed. It is stable and economical but is paint-grade only - the finger joints telegraph through clear and stained finishes. {note}
+## Finish Type {toc}
−## Clear solid pine and poplar serve standard commercial and institutional painted and stained work; oak and maple serve stain-grade institutional and hospitality work where a visible hardwood grain is wanted. {note}
+### The finish type of each trim element shall be as indicated in the datasheet.
−## Poplar deserves a note of its own among the solids: it is a hardwood by botanical classification and machines and paints cleanly, but its greenish, blotch-prone grain makes it a paint-grade choice in practice. It is the default solid-wood paint-grade trim where finger-jointed stock is not wanted because clear lengths must be visible. {note}
+```datasheet
+label: Trim Finish Type
+type: radio
+drawing_ref: "the finish schedule"
+options:
+ - "Transparent"
+ - "Opaque"
+default: deferred
+```
−## Cellular PVC is specified where wood is inappropriate - high-humidity rooms, semi-wet areas, and locations where a wood profile would swell or rot. It is moisture-immune and paintable but moves more with temperature than wood, so joinery and fastening detail differ. {note}
+### The finish type governs which material article below applies to the element, which molding grade the element is furnished at, and which delivery state applies.
−## Thermally fused laminate and high-pressure-laminate-wrapped MDF profiles serve healthcare and commercial spaces that require a durable, wipe-down surface integral to the trim. {note}
+#### A transparent finish shows the wood, so the material is selected for species, color, and grain, and every joint and filled hole shows. An opaque finish hides the substrate, so the material is selected for how it machines and holds a film, and finger joints, composite board, and polymer profiles all become candidates. Painted trim against stained doors is a common schedule, which is why the finish type is scheduled per element rather than per project. {note}
−## Pre-finished stain-grade solid or engineered profiles, finished in the shop before delivery, suit architectural and boutique hospitality work where field finishing is impractical or where a controlled factory finish is wanted; they shift finishing risk to handling and protection rather than to the painting trade. {note}
+## Material for Opaque-Finished Trim {toc}
−# Wood and composite trim materials shall meet the following grading and material requirements.
+### The material for trim that receives an opaque finish shall be as indicated in the datasheet.
−## Solid hardwood trim shall be graded to NHLA rules; FAS grade is the standard for finish carpentry, with No. 1 Common acceptable only where specifically permitted for paint-grade work.
+```datasheet
+label: Opaque-Finished Trim Material
+type: select
+options:
+ - "Finger-jointed pine"
+ - "Finger-jointed poplar"
+ - "Clear pine"
+ - "Poplar"
+ - "Soft maple"
+ - "Medium density fiberboard"
+ - "Moisture-resistant medium density fiberboard"
+ - "Cellular PVC"
+ - "Foam plastic molding"
+```
−## Solid softwood trim shall be graded to PS 20; C-Select or better shall be furnished for clear and stain-grade applications.
+### Medium density fiberboard trim shall be a molding-grade board conforming to ANSI A208.2, with a machined profile free of fuzz and torn fiber.
−## MDF and HDF profiles shall be furnished as moisture-resistant grade in any location subject to incidental moisture; standard MDF shall not be used in restrooms, janitor closets, mechanical rooms, or other areas with periodic moisture exposure.
+### Cellular PVC trim shall be an interior-rated product with a current evaluation report from an accredited evaluation service covering its surface burning characteristics and its use as interior trim.
−## Cellular PVC trim shall be furnished in lieu of wood or MDF in high-humidity and semi-wet locations where wood-based trim is not appropriate.
+### Foam plastic molding shall comply with the density, thickness, width, area, and flame spread limits that [[parameter: adopted-building-code]] places on foam plastic interior trim, and shall bear the manufacturer's label identifying the product and its listed flame spread index.
+#### Finger-jointed pine is the least expensive solid-wood paint-grade trim and is stocked primed in long lengths; the joints are invisible under paint and telegraph under anything else. Poplar and soft maple are close-grained hardwoods that take a crisp profile and a smooth enamel and hold a fastener well, at a higher cost than pine. Clear pine is selected where the design wants a softwood profile without joints, at a cost above finger-jointed stock. Medium density fiberboard machines a routed profile with no grain raise and no knots, is the flattest and straightest of the options, and is stocked primed; it swells irreversibly where liquid water reaches it, holds a fastener poorly in its edge, and is the heaviest material per foot. The moisture-resistant grade resists incidental wetting and humidity swings but is not a wet-location product. Cellular PVC is unaffected by water and is selected for restrooms, locker rooms, and wet-cleaned floors; it moves with temperature rather than humidity, cannot be stained, and needs its own fasteners and adhesive. Foam plastic molding is light, is stocked in large crown profiles that would be costly in wood, and is limited by the building code in density, size, area, and flame spread. {note}
+
+## Species for Transparent-Finished Trim {toc}
+
+### The species for trim that receives a transparent finish shall be as indicated in the datasheet.
+
```datasheet
−label: Trim material - running trim (base, casing, crown)
+label: Transparent-Finished Trim Species
type: select
+drawing_ref: "the finish schedule"
options:
− - Paint-grade MDF (moisture-resistant where required)
− - Finger-jointed primed pine
− - Clear solid pine
− - Clear solid poplar
− - Solid oak (stain grade)
− - Solid maple (stain grade)
− - Cellular PVC
− - TFL / HPDL-wrapped MDF
−default: Paint-grade MDF (moisture-resistant where required)
+ - "Red oak"
+ - "White oak"
+ - "Hard maple"
+ - "Soft maple"
+ - "Poplar"
+ - "Cherry"
+ - "Black walnut"
+ - "Ash"
+ - "Hickory"
+ - "Alder"
+ - "Birch"
+ - "Clear pine"
+ - "Douglas fir"
+ - "Western red cedar"
+default: deferred
```
+### Transparent-finished trim within a related area of the project shall be furnished from one species and shall be selected for compatible color and grain across the area.
+
+#### Species sets color, hardness, grain figure, and cost, and it also sets how a stain reads: the same stain on red oak, hard maple, and cherry produces three different colors, which is why the finish sample under [[sync/interior-painting]] is approved on the actual species. The oaks, ash, and hickory are open-grained and show pore and figure; maple, cherry, birch, alder, and poplar are close-grained and take a stain evenly, and poplar's green and gray streaks limit it to dark stains. Pine, fir, and cedar are softwoods that dent under a fingernail and are selected where the design wants their figure and color. Stock moldings are run in every one of these species but not in every profile; a profile wanted in an uncommon species is confirmed as a catalog item before it is scheduled. {note}
+
+## Hardwood Lumber Grade {toc}
+
+### Hardwood lumber and hardwood stair parts furnished under this standard shall be graded under the NHLA Rules at the grade indicated in the datasheet.
+
```datasheet
−label: Surface preparation state at delivery
−type: radio
+label: Hardwood Lumber Grade
+type: select
options:
− - Raw (field prime and finish)
− - Pre-primed (field finish only)
− - Pre-finished (factory finish, field touch-up)
−default: Pre-primed (field finish only)
+ - "FAS"
+ - "FAS One Face"
+ - "Selects"
+ - "No. 1 Common"
```
−## The surface-preparation state is a coordination decision, not just a product attribute: it dictates how the painting trade is sequenced against this work. Pre-primed trim assumes walls are primed before trim is set, then top-coated after; reverse that order and raw overlap edges and caulk lines are left unfinished. {note}
+#### The NHLA grades are based on the yield of clear cuttings from a board. FAS yields the largest clear cuttings from both faces and is the grade long clear trim and stair parts are cut from; FAS One Face holds the FAS yield on the face that shows and admits the No. 1 Common yield on the back, which suits trim seen from one side; Selects is a narrower and shorter FAS One Face; No. 1 Common yields shorter clear cuttings and is selected where the pieces are short, where character is wanted, or where cost governs. A long base run cut from No. 1 Common is a run with joints in it. {note}
−# Hardwood species for stain-grade work shall be specified where a hardwood is selected.
+## Softwood Lumber Grade {toc}
+### Softwood lumber furnished under this standard shall be graded under PS 20 and the WWPA Western Lumber Grading Rules or the equivalent rules of the regional grading agency, at the grade indicated in the datasheet.
+
```datasheet
−label: Hardwood species (stain-grade applications)
+label: Softwood Lumber Grade
type: select
options:
− - Red oak
− - White oak
− - Hard maple
− - Poplar (paint grade)
− - Cherry
− - Walnut
−default: Red oak
+ - "B and Better Select"
+ - "C Select"
+ - "D Select"
+ - "Superior Finish"
+ - "Prime Finish"
```
−# Profiles and Dimensions {toc}
+#### The Select grades are the appearance grades of the western and northeastern rules: B and Better Select is practically clear, C Select admits a few small characteristics on the face, and D Select admits more and is normally confined to paint. Superior and Prime are the Finish grades the same rules apply to Douglas fir, hem-fir, and the pines in some regions, Superior corresponding roughly to C Select and Prime to D Select. The grade names and their limits are set by the rule-writing agency, and a bidder reads them from the grade stamp or the invoice. {note}
−## Trim profiles shall be standard catalog profiles, and the section dimensions shall suit the room scale and project grade.
+## Molding Grade {toc}
−### Only stock catalog profiles are within this section. A profile that must be custom-milled to a project-specific drawing is architectural woodwork, not finish carpentry, and belongs in a different scope and a different submittal path; specifying a custom profile here creates a fabrication and submittal gap between the millwork fabricator and the carpentry subcontractor. {note}
+### Stock wood moldings shall be furnished at the WMMPA grade indicated in the datasheet.
−### Base molding height is the most visible scale decision: residential work runs 2-1/4 inch to 3-1/2 inch, while commercial and institutional work runs taller, commonly 3-1/2 inch to 5-1/4 inch or more, to hold proportion against taller ceilings. {note}
+```datasheet
+label: Stock Wood Molding Grade
+type: select
+derived: "the trim finish type: N-Grade for a transparent finish, P-Grade for an opaque finish"
+options:
+ - "N-Grade"
+ - "P-Grade"
+default: derived
+```
−### Crown molding is sold in two stock spring angles, 38° and 45°, which set the projection-to-drop ratio and the cope geometry; 45° is the more common choice in commercial work. The spring angle must be coordinated with available ceiling-to-wall clearance and with any cove lighting or soffit above. {note}
+#### The molding grades are set by the molding industry rather than the lumber graders and describe the run profile rather than the board it came from. N-Grade is cut for a natural finish, with no finger joints and a face free of the characteristics a stain would show; P-Grade is cut for paint and admits finger joints and the small, sound characteristics a primer and two coats cover. The grade follows the finish type, so it is derived rather than selected, and the engineer overrides it only to require N-Grade under a paint where no joint is to telegraph. {note}
−### The base molding height shall be specified, sized to suit the room scale and project grade.
+## Delivery State of Opaque-Finished Trim {toc}
+### The delivery state of trim that receives an opaque finish shall be as indicated in the datasheet.
+
```datasheet
−label: Base molding height
+label: Opaque-Finished Trim Delivery State
+type: radio
+options:
+ - "Factory-primed"
+ - "Unprimed"
+ - "Factory-finished"
+default: "Factory-primed"
+```
+
+### Factory primer shall be compatible with the topcoat system under [[sync/interior-painting]] and shall be identified in the product data.
+
+### Where unprimed trim is selected, the Contractor shall back-prime it and prime its cut ends before installation under the primer system of [[sync/interior-painting]].
+
+#### Finger-jointed and fiberboard moldings are stocked primed, so the primed state is what a paint-grade order arrives in unless something else is asked for. Unprimed stock is selected where the finish system wants its own primer or where the primer must be tinted; it adds a field priming operation and leaves the back and the cut ends to be primed on site. A factory-finished molding arrives with its topcoat on, saves the painting trade a pass, and has to be set with the fill, caulk, and paint operations already ruled out, so every fastener hole and every wall joint on it is touched up rather than painted over. {note}
+
+## Delivery State of Transparent-Finished Trim {toc}
+
+### The delivery state of trim that receives a transparent finish shall be as indicated in the datasheet.
+
+```datasheet
+label: Transparent-Finished Trim Delivery State
+type: radio
+options:
+ - "Unfinished"
+ - "Factory-sealed"
+ - "Factory-finished"
+default: "Unfinished"
+```
+
+### Where factory-finished trim is selected, the Contractor shall seal every field cut with the manufacturer's matching material and shall fill fastener holes with a filler matched to the finished color before the trim is accepted.
+
+#### Stain-grade stock moldings are sold unfinished and are stained and clear-coated in place under [[sync/interior-painting]], which is how the trim is matched to the doors and the floor. A factory seal protects the wood through delivery and leaves the color to the field; a factory finish fixes the color before the adjacent woodwork is finished and leaves field repair of a damaged face to a touch-up kit. {note}
+
+## Trim at Wet and High-Humidity Locations {toc}
+
+### The locations at which trim is exposed to wetting, to wet cleaning of the floor, or to sustained high humidity shall be as indicated on [[drawing: the room finish schedule]].
+
+### The trim material at those locations shall be as indicated in the datasheet.
+
+```datasheet
+label: Trim Material at Wet and High-Humidity Locations
type: select
options:
− - 2-1/4 inch
− - 3-1/4 inch
− - 3-1/2 inch
− - 4-1/4 inch
− - 5-1/4 inch
− - 5-1/4 inch or taller
−default: 3-1/2 inch
+ - "Cellular PVC"
+ - "Moisture-resistant medium density fiberboard"
+ - "Solid wood, opaque-finished, back-primed and end-sealed"
+ - "Same material as the dry locations"
```
−### The crown molding spring angle shall be specified, coordinated with the available ceiling-to-wall clearance and any cove lighting or soffit above.
+### Standard medium density fiberboard shall not be used at a location designated wet unless the datasheet selects it as the same material as the dry locations.
+#### The base at a restroom, a janitor closet, or a locker room floor is mopped daily and stands in water when a fixture overflows. Cellular PVC takes that service without change; moisture-resistant fiberboard takes the humidity and the incidental splash but not standing water; back-primed and end-sealed solid wood takes it for the life of its paint film. Keeping one material throughout is a legitimate policy where the Owner accepts replacing the base at the wet rooms, and where the wet rooms carry a resilient or tile base instead of wood this field does not apply. {note}
+
+## Composite-Wood Formaldehyde Emissions {toc}
+
+### Every composite-wood component furnished under this standard, including medium density fiberboard trim, particleboard and fiberboard shelving, and veneered plywood shelving, shall comply with 40 CFR Part 770 and CARB ATCM 93120 and shall be labeled or certified accordingly.
+
+### The compliance level required shall be as indicated in the datasheet.
+
```datasheet
−label: Crown molding spring angle
+label: Composite-Wood Formaldehyde Compliance Level
type: radio
options:
− - 38°
− - 45°
−default: 45°
+ - "TSCA Title VI and CARB Phase 2 certified"
+ - "Ultra-low-emitting formaldehyde (ULEF) exempt panels"
+ - "No-added-formaldehyde (NAF) exempt panels"
+default: "TSCA Title VI and CARB Phase 2 certified"
```
−### The running trim elements included in the project scope shall be specified.
+#### Compliance with 40 CFR Part 770 is a condition of lawful sale in the United States and is not a project option; the datasheet selection determines only whether the project requires the further ULEF or NAF exemption levels, which a green-building program or an Owner's indoor air policy can call for. The exemptions are granted to the panel producer, so a ULEF or NAF molding is a supply question confirmed in the product data rather than a specification the installer can meet by choice. {note}
+# Interior Finish Fire Classification {toc}
+
+## Trim is regulated under Chapter 8 of [[parameter: adopted-building-code]] as interior trim where it covers not more than the code's share of the wall or ceiling area of a room, and as interior wall or ceiling finish where it covers more. {note}
+
+## The flame spread class required of trim shall be as indicated in the datasheet.
+
```datasheet
−label: Running trim elements in scope
−type: checkbox
+label: Required Flame Spread Class of Trim
+type: radio
options:
− - Base molding
− - Door casing
− - Window casing
− - Crown molding
− - Chair rail
− - Wainscot cap
− - Picture rail
− - Stool and apron
− - Bed mold / cornice
−default:
− - Base molding
− - Door casing
− - Window casing
− - Crown molding
+ - "Class A"
+ - "Class B"
+ - "Class C"
+default: "Class C"
```
−### Window stool and apron, where specified, shall be furnished with the stool notched to the rough opening and the apron returned to the casing, sized to the wall and casing thickness.
+## Where trim exceeds the interior trim area limit of [[parameter: adopted-building-code]] in a room, the trim in that room shall meet the interior wall and ceiling finish class the code requires for the occupancy and location, and that class shall be as indicated on [[drawing: the code analysis and life safety plans]].
−# Fire Performance {toc}
+## The classification shall be established by ASTM E84 or UL 723 testing of the trim material in the form it is installed, including any factory finish.
−## Interior trim is a regulated interior finish material, and its flame-spread classification shall be specified.
+### Class A is a flame spread index of 0 to 25, Class B is 26 to 75, and Class C is 76 to 200, each with a smoke-developed index limit of 450. The IBC treats base, casing, chair rail, and similar trim within its area limit as interior trim and requires Class C of it in every occupancy, which untreated wood and primed fiberboard meet, so Class C is the class nearly every stock trim order carries. A room whose wall is largely covered by applied trim, or a design that stacks moldings into a cornice covering a large share of the ceiling, crosses into interior finish and takes the class of the occupancy, which in a corridor, an exit enclosure, or an assembly or institutional space is Class A or B. Foam plastic trim carries its own flame spread limit under the code, set lower than Class C. {note}
−### Under IBC Chapter 8, interior trim is not exempt decoration - it is a regulated interior finish with a flame-spread and smoke-developed obligation that varies by occupancy. Omitting this requirement invites code-review comments and, worse, field material changes after the trim is already ordered. {note}
+### A field-applied finish does not change the classification of the trim unless the finish is a listed fire-retardant coating applied as its listing requires, and a fire-retardant coating is not a route this standard offers. Trim that cannot meet the required class untreated is pressure-treated fire-retardant wood, which is custom-run and belongs under [[sync/architectural-wood-trim-and-paneling]]. {note}
−### The classes derive from ASTM E84 (the tunnel test): Class C is flame-spread index ≤ 200 and smoke-developed index ≤ 450; Class B is flame-spread index ≤ 75; Class A is flame-spread index ≤ 25. {note}
+# Installation {toc}
−### Interior trim shall meet Class C (flame-spread index ≤ 200, smoke-developed index ≤ 450) as a minimum in occupancies where no more stringent requirement applies.
+## Blocking and Backing {toc}
−### In assembly occupancies (Groups A-1 and A-2), trim covering more than 10% of the aggregate wall and ceiling area shall meet Class B (flame-spread index ≤ 75).
+### The trade that furnishes and installs the concealed blocking and backing this trim is fastened to shall be as indicated in the datasheet.
−### The 10% area threshold matters because ordinary running trim - base and casing - rarely exceeds it, but extensive applied wainscot, full-height picture-rail-and-panel schemes, or dense decorative trim can. Where the design pushes trim coverage up, the Class B obligation in assembly spaces is triggered and the material must be selected to meet it from the outset, not discovered at code review. {note}
+```datasheet
+label: Concealed Blocking and Backing Furnished Under
+type: radio
+options:
+ - "The wall and ceiling framing trades"
+ - "The Contractor performing the work of this standard"
+default: "The wall and ceiling framing trades"
+```
−### The flame-spread classification shall be confirmed for the specific trim material and any applied finish, because field-applied coatings can change the assembly's tested rating.
+### Before installation begins the Contractor shall verify that blocking or framing is present behind every chair rail, every base taller than 5-1/2 in., every crown that is fastened to the wall rather than to the ceiling framing, every closet shelf cleat and rod support, every handrail bracket, and every item furnished by others that this standard installs.
+### The Contractor shall notify the Engineer of Record of missing or mislocated blocking before proceeding, and shall not fasten trim over a known deficiency.
+
+### Base, casing, and other trim within the reach of a framing member shall be fastened to the framing, and the gypsum board alone shall not carry a trim element that bears a load or is struck in service.
+
+#### Blocking is installed by the framing trades under [[sync/rough-carpentry]] and [[sync/gypsum-board-assemblies]] before the wall is closed, which is why the trim layout has to be known before the board goes on. A chair rail hit by a chair back, a tall base kicked by a cart, and a closet rod loaded with coats all pull on their fasteners, and a fastener in gypsum board alone pulls out. Standard-height base and casing land on the bottom plate and the jamb studs and need no separate blocking, which is why the verification is tied to the items that do. {note}
+
+## Layout and Running Joints {toc}
+
+### The Contractor shall lay out each run to minimize the number of joints in it and to place the joints that stock lengths require away from the center of a wall and away from sightlines where the stock length allows.
+
+### Running joints in trim shall be scarf joints cut at not less than 45 degrees to the face, glued, and located over a framing member or blocking.
+
+### Unless the Contract Documents indicate otherwise, a square butt joint shall not be used as a running joint in exposed trim.
+
+### Long runs shall be measured and cut from a fixed reference so that cutting error does not accumulate along the run.
+
+#### A scarf joint laps the two pieces so that shrinkage opens a feathered line rather than a square gap, and landing it on solid backing lets both pieces be fastened at the joint; a scarf floating over a stud cavity opens as the building cycles through its first season. The 45 degree angle is the shallowest that hides the joint under paint; stain-grade work is commonly scarfed shallower, which uses more length. {note}
+
+## Inside and Outside Corners {toc}
+
+### The inside-corner joint in profiled running trim shall be as indicated in the datasheet.
+
```datasheet
−label: Required interior finish classification for trim
+label: Inside-Corner Joint in Profiled Running Trim
type: radio
options:
− - Class C (FSI ≤ 200, SDI ≤ 450)
− - Class B (FSI ≤ 75)
− - Class A (FSI ≤ 25)
−default: Class C (FSI ≤ 200, SDI ≤ 450)
+ - "Coped"
+ - "Mitered"
+ - "Butted to a corner block"
+default: "Coped"
```
−# Installation Tolerances {toc}
+### The outside-corner joint in profiled running trim shall be as indicated in the datasheet.
−## Installed trim shall meet the tolerances of the declared AWI grade; the values below state the Custom-grade defaults.
+```datasheet
+label: Outside-Corner Joint in Profiled Running Trim
+type: radio
+options:
+ - "Mitered"
+ - "Butted to a corner block"
+default: "Mitered"
+```
−### Tolerances are what "good finish carpentry" actually means in measurable terms. The Custom-grade values below are the default; declare Economy or Premium and these numbers shift accordingly. {note}
+### Mitered outside corners shall be glued and shall be fastened through both faces of the corner so that the miter is held closed from both sides.
−### Running and standing trim shall be installed level and plumb within 1/8 inch in 8 feet (3 mm in 2438 mm).
+### Where the material does not permit coping, as with a cellular PVC or foam plastic profile, the inside corner shall be mitered and bonded with the adhesive the manufacturer specifies for that material.
−### Flush joints between adjacent trim members shall not exceed 1/32 inch (0.8 mm) face offset.
+#### A coped inside corner cuts one member to the reverse profile of the other, so the joint closes on a profile line rather than on a glue line; it holds its appearance when the wall corner is out of square and when the members shrink, both of which open a mitered inside corner. A mitered outside corner is the only joint that carries the profile continuously around a projecting corner. Corner blocks and plinths remove the corner joint from the profile entirely by terminating both runs against a square block, which is a design decision about how the trim reads rather than a fallback for a difficult corner. {note}
−### Reveal joints, where the trim is intentionally set proud of an adjacent surface, shall not exceed 1/16 inch (1.5 mm) variation in the reveal dimension.
+## Casing and Jamb Extensions at Openings {toc}
−### Caulk joints at design gaps shall be 1/8 inch (3.2 mm) wide, +0 / -1/16 inch, and shall be uniform along the run.
+### Casing at each door and window opening shall be set to a uniform reveal from the face of the jamb, and the reveal shall be as indicated in the datasheet.
```datasheet
−label: Level and plumb tolerance
+label: Casing Reveal From the Jamb Face
+type: range
+unit: in.
+options:
+ min: 0.125
+ max: 0.375
+ setpoints: [0.125, 0.1875, 0.25, 0.3125, 0.375]
+default: 0.25
+constraint: exact
+```
+
+### The joint between the head casing and the leg casings shall be as indicated in the datasheet.
+
+```datasheet
+label: Casing Head Joint
+type: radio
+options:
+ - "Mitered"
+ - "Butted head casing"
+ - "Rosette and plinth blocks"
+default: "Mitered"
+```
+
+### Mitered casing head joints shall be glued and shall be fastened across the miter so that the joint does not open as the casing shrinks.
+
+### Where the jamb furnished with the door or window does not reach the face of the finished wall, the Contractor shall furnish a jamb extension of the casing material, ripped to bring the jamb flush with the wall and fastened to the jamb so that the casing reveal is uniform on both sides of the opening.
+
+### Window stools shall be notched around the jambs and returned on the ends, and the apron shall be cut to the width of the casing and returned on its ends.
+
+### The Contractor shall coordinate the casing reveal with the hinge and strike locations under [[sync/door-hardware]] or [[sync/doors-frames-and-hardware]] so that no hinge leaf or strike plate is covered.
+
+#### A 1/4 in. reveal is what stock casing and stock jambs are made for and is the reveal nearly every opening is trimmed to; a narrower reveal is selected for a thin casing and a wider one for a heavy profile. A mitered head joint carries the profile continuously around the opening and is the joint stock casing is designed for; a butted head casing sets a thicker head over square-cut legs and suits a flat or beaded casing; rosette and plinth blocks terminate the legs and head against square blocks at the corners and the floor, which puts no miter on the opening and is selected for a traditional design or where the legs and head are different profiles. The jamb extension exists because wood door jambs are made for a 4-9/16 in. wall and the wall is often thicker. {note}
+
+## Fastening {toc}
+
+### The fastening method for trim shall be as indicated in the datasheet.
+
+```datasheet
+label: Trim Fastening Method
type: select
options:
− - 1/16 inch in 8 feet (Premium)
− - 1/8 inch in 8 feet (Custom)
− - 3/16 inch in 8 feet (Economy)
−default: 1/8 inch in 8 feet (Custom)
+ - "Pneumatic finish nails, set and filled"
+ - "Trim-head screws, countersunk and filled"
+ - "Adhesive with pin nails"
+ - "Concealed clips on a continuous carrier"
+default: "Pneumatic finish nails, set and filled"
```
+### Trim shall be fastened at each framing member it crosses and at a spacing along the run not greater than that indicated in the datasheet.
+
```datasheet
−label: Maximum flush joint face offset
+label: Fastener Spacing Along Running Trim
type: range
−unit: inch
−min: 0
−max: 0.0625
−step: 0.0078125
−default: 0.03125
+unit: in.
+options:
+ min: 8
+ max: 24
+ setpoints: [8, 12, 16, 24]
+default: 16
+constraint: max
```
−# Installation {toc}
+### Fasteners shall be of a length that penetrates the framing or blocking by not less than 3/4 in. and shall be placed so that no fastener head lies within the profile's visible curves where the material allows.
−## Trim shall be laid out, cut, fitted, and fastened to produce tight, durable joinery consistent with the declared grade.
+### Fasteners in cellular PVC trim shall be stainless steel or a corrosion-resistant coated fastener the trim manufacturer identifies for the product, and shall be driven at the spacing the manufacturer publishes.
−### The craft of this trade lives in the joints. Where two pieces of trim meet, the joint must stay closed through seasonal humidity cycling, and the techniques below - coping, gluing miters, landing scarf joints on solid wood - all exist to keep joints from opening when the wood moves. {note}
+### Fasteners in trim fastened to preservative-treated or fire-retardant-treated blocking shall be hot-dip galvanized or stainless steel.
−## Layout
+### Fastener holes in trim that receives an opaque finish shall be filled under [[sync/interior-painting]] after the trim is primed.
−### Trim runs shall be laid out to minimize the number of joints in a run and to place necessary joints away from sightlines wherever practical.
+### Fastener holes in trim that receives a transparent finish shall be filled with a filler matched to the finished color after the first finish coat is applied, by the Contractor performing the work of this standard, coordinated with [[sync/interior-painting]].
−### The installer shall plan joint and scarf locations against the framing layout before cutting, so that joints fall over solid backing rather than over open stud cavities.
+#### A set finish nail is the fastest method, holds a stock profile adequately, and leaves a hole that disappears under paint; it is what nearly every trim run is set with. A trim-head screw draws a bowed piece tight to an uneven wall and holds in dense hardwood or in a hollow substrate where a nail would not, at the cost of a larger hole. Adhesive with pin nails leaves almost no hole and is selected for transparent-finished work and for fiberboard whose edge will not hold a nail; the pins hold the piece until the adhesive cures. Concealed clips put no fastener in the face at all and are selected where a factory-finished molding is to show no filler. {note}
−### Long runs shall be measured and fitted from a fixed reference rather than accumulating cut-to-cut error along the wall, so the final piece in a run does not absorb the drift of every joint before it.
+#### Treated lumber corrodes bright steel, and cellular PVC moves enough with temperature to work a bright nail loose; both call for their own fastener. A filled hole in a painted member disappears under the film; the same hole in a transparent-finished member remains a visible spot of a different color unless the filler is matched to the finished wood rather than the raw wood, which is why the filling waits for the first coat. {note}
−## Joinery
+## Scribing, Fitting, and Wall Joints {toc}
−### Coping is the correct technique for inside corners of profiled running trim (base and crown) because the joint stays tight as the wood moves and as corners go out of square; an inside miter depends on the corner being perfectly 90° and on the wood not moving, so it opens with any humidity change or framing imperfection. {note}
+### Trim meeting walls, floors, ceilings, and adjacent finishes shall be scribed to the contour of the adjacent surface where the installation grade requires a closed joint, so that the joint closes tight and reads uniform.
−### A coped inside corner is cut by mitering the second piece, then back-cutting along the revealed profile line so it nests over the face of the first piece. Unlike an inside miter, a cope does not gap open at the visible face when the corner is slightly out of square or when the wood shrinks - the joint hides its own movement. {note}
+### Transparent-finished trim shall be scribed to the adjoining surface and shall not be caulked to it.
−### Inside corners of profiled running trim shall be coped, not mitered, except where the profile or material does not permit coping.
+### The joint between opaque-finished trim and the adjoining wall or ceiling surface shall be closed with a paintable acrylic latex sealant before the finish coats are applied, and the trade that applies the sealant shall be as indicated in the datasheet.
−### Outside corner miters shall be glued and mechanically fastened, with the miter reinforced by fasteners driven through both faces of the corner.
+```datasheet
+label: Caulking of Trim-to-Wall Joints Performed Under
+type: radio
+options:
+ - "The painting trade, under interior painting"
+ - "The Contractor performing the work of this standard"
+```
−### Scarf joints in running trim shall be cut at not less than 45° and shall land on solid blocking or a stud; a scarf joint floating over a cavity will open as the building cycles through humidity.
+### Material shall be cut and back-cut so that face joints close before fastening, and a joint shall not be drawn closed by the fastener.
−### Mitered casing joints at door and window heads shall be glued and nailed; head-to-leg joints shall be reinforced so they do not open.
+### Trim shall be fitted to the floor finish as installed: base shall be set to clear the finish flooring by the gap the flooring standard requires for expansion, and shoe shall be fastened to the base, not to the floor.
−### Material shall be cut and back-cut as needed so that face joints close tight before fastening, rather than being drawn closed by the fastener.
+#### Building surfaces are rarely flat, plumb, or square, so a piece set against an untouched wall leaves a tapered gap that widens along its length. Under paint the gap is caulked and painted with the wall, and the trade that caulks is a coordination decision between the carpenter who knows the joint and the painter who is already masking it; under a transparent finish a caulk line is a visible bead of another material, so the piece is scribed instead. The base is set above the floor rather than on it because a wood or resilient floor expands under it, and a shoe nailed to the floor pins the floor at the wall. {note}
−## Fastening
+## Cellular PVC and Foam Plastic Trim {toc}
−### The fastening method shall suit the substrate, profile width, and required appearance. Pneumatic finish nails are the default for most painted trim; trim screws develop more holding power on dense or hollow substrates; adhesive plus pins or hidden clip systems are used where a fastener-free face is required.
+### Cellular PVC trim shall be installed with the expansion gaps, the adhesive at joints, and the fastener spacing the manufacturer publishes for the length and the service temperature range.
−### Trim shall be fastened into solid framing or backing wherever it occurs; fastening into drywall alone, without backing, is not acceptable for trim that bears load or is subject to impact, such as chair rail and tall base.
+### Joints in cellular PVC trim shall be bonded with the PVC cement the manufacturer identifies, so that the run moves as one piece rather than at each joint.
−### Exposed fasteners shall not exceed 3/16 inch (4.8 mm) in diameter.
+### Foam plastic molding shall be installed with the adhesive and the fasteners the manufacturer identifies, and shall not be installed where its listed flame spread index or its area limit under [[parameter: adopted-building-code]] would be exceeded.
−### Finish nails shall be set below the surface and the holes filled flush; trim screws shall be countersunk and plugged or puttied to match.
+#### Cellular PVC does not move with humidity but does move with temperature, by roughly 1/4 in. over a 16 ft length across a 50°F swing, which is more than wood moves across a season. Gluing the running joints turns a long run into one piece whose total movement is taken at its ends, behind a corner or a casing, rather than as an opening gap at every joint. Foam plastic is set with adhesive because it will not hold a nail; its code limits are the reason the material is confirmed against the room before it is ordered. {note}
−### Pre-finished and stain-grade trim shall be fastened so that fastener heads are concealed or are minimized and filled with color-matched putty, preserving the finished appearance.
+## Closet Shelving and Rod {toc}
+### The material of stock closet shelving shall be as indicated in the datasheet.
+
```datasheet
−label: Primary fastening method
+label: Closet Shelving Material
type: select
options:
− - Pneumatic finish nail (set and filled)
− - Trim screw (countersunk, plugged or puttied)
− - Adhesive with pin nails
− - Hidden clip system
−default: Pneumatic finish nail (set and filled)
+ - "Melamine-faced particleboard"
+ - "Solid pine"
+ - "Medium density fiberboard, primed"
+ - "Veneered plywood with a hardwood front edge"
```
+### The closet rod shall be as indicated in the datasheet.
+
```datasheet
−label: Maximum exposed fastener diameter
+label: Closet Rod
+type: select
+options:
+ - "Hardwood dowel"
+ - "Chrome-plated steel tube"
+ - "Oval steel rod with end flanges"
+```
+
+### Shelves shall be not less than 3/4 in. thick, supported on cleats at the back and both ends, and fastened to the cleats.
+
+### Shelves and rods shall have an intermediate support at a spacing not greater than that indicated in the datasheet.
+
+```datasheet
+label: Closet Shelf and Rod Support Spacing
type: range
−unit: inch
−min: 0
−max: 0.1875
−step: 0.03125
−default: 0.1875
+unit: in.
+options:
+ min: 24
+ max: 48
+ setpoints: [24, 32, 36, 48]
+constraint: max
```
−## Coordination with adjacent trades
+### Rod supports shall be fastened to blocking or framing, and the rod shall be set at the height indicated on [[drawing: the interior elevations]].
−### The transition where trim meets painted drywall shall be detailed as either a caulked joint or a tight fit, and that decision shall be coordinated with the painting trade so the required joint tolerance and paint sequence are understood before installation. {note}
+### Melamine-faced and veneered shelving shall be edged on the front edge, and every exposed edge of a composite shelf shall be banded or finished so that no core is left open.
−### Where pre-primed trim is used, walls shall be primed before trim is set and top-coated after, so that overlap edges and caulk lines receive finish.
+#### A melamine-faced particleboard shelf needs no finish and wipes clean, is the least expensive, and sags over a long span under a loaded rod. Solid pine and primed fiberboard are painted with the trim and read as part of it; pine holds a screw and a cleat nail well, fiberboard is flatter and heavier. Veneered plywood with a hardwood edge is selected for a transparent finish or for a long span. A wood dowel matches a stained closet and deflects under a full rod of coats beyond about 36 in.; a steel tube or an oval rod spans farther and is selected where the closet is wide. {note}
−### The installer shall coordinate the trim installation with HVAC commissioning so that trim is not installed before the building reaches the specified conditioned state.
+## Stock Wood Stair Parts {toc}
−### Drawing-coordinated items - the location and extent of wainscot, the runs that receive chair rail or picture rail, and similar arrangement decisions - shall be installed as shown [[drawing: trim location and extent plans]].
+### Stock wood stair treads, risers, skirtboards, handrails, newels, and balusters, where included in the work, shall be furnished in the species and grade selected for transparent-finished trim or the material selected for opaque-finished trim, as the finish schedule indicates for the stair.
+### Treads and risers shall be glued and fastened to the stringers or carriages furnished under [[sync/wood-framing]], and a tread shall not be fastened to a riser alone.
+
+### Handrails and guards assembled from stock parts shall resist the handrail and guard loads of [[parameter: adopted-building-code]], and the handrail profile and its height shall meet the graspability and height provisions of that code.
+
+### Newels shall be anchored to the stair framing or the floor framing with the hardware the newel manufacturer identifies, and a newel shall not be anchored to the tread or the finish floor alone.
+
+### Handrail brackets shall be fastened to framing or blocking, at a spacing not greater than the bracket manufacturer's published spacing for the handrail loads.
+
+#### Stock stair parts are catalog items in the same way stock moldings are, which is why they are finish carpentry rather than architectural woodwork; the structural stair they sit on is framing. The code loads on a handrail and a guard are structural requirements that the stock parts meet only when they are anchored into framing, and a loose newel is the most common failed inspection item on a wood stair. A stair in metal is governed by [[sync/metal-stairs-and-railings]]. {note}
+
+## Items Furnished by Others {toc}
+
+### Where the work includes the field installation of items furnished by the Owner or under another standard, the Contractor shall install them in accordance with the furnishing party's written instructions, into blocking or framing verified under this standard, and shall report a damaged or incomplete item to the Engineer of Record before it is installed.
+
+### The Contractor shall be responsible for an item from the time it is accepted for installation until Substantial Completion, and the furnishing party shall remain responsible for a defect in the item itself.
+
+#### The handoff is written so that each party owns what it controls: the installer owns the anchorage and the fit, the furnishing party owns the product. An item accepted without inspection becomes the installer's problem when the defect is found after it is on the wall. {note}
+
+# Inspection of Completed Work {toc}
+
+## After installation the Contractor shall inspect the completed finish carpentry and shall correct or replace work that does not comply before requesting the Engineer of Record's review.
+
+## Running trim shall be checked for tight corner joints, closed running joints in the laid-out locations, uniform casing reveals, and conformance to the installation grade tolerances.
+
+## Exposed surfaces shall be checked for handling damage, torn profile edges, fastener heads not set, and filler that does not match.
+
+## Work that fails to meet the specified installation grade or that is damaged shall be corrected or replaced at the Contractor's cost, including the cost of refinishing a replaced piece to match its neighbors.
+
# Delivery, Storage, and Handling {toc}
−## Trim shall be delivered, stored, and handled so that it reaches installation clean, straight, and at the correct moisture content.
+## Delivery and On-Site Storage {toc}
−### Trim shall be delivered to the project only after the installation space is conditioned and ready to receive and store it under the specified temperature and humidity.
+### Trim, shelving, and stair parts shall be delivered only after the building readiness conditions of this standard are satisfied.
−### Trim shall be stored flat and fully supported, off the floor, in the conditioned installation space, and shall not be stored in unconditioned areas, on damp slabs, or in contact with masonry or concrete.
+### Material shall be stored inside the conditioned space, flat, fully supported along its length, and protected from moisture, direct sunlight, and physical damage.
−### Pre-finished trim shall be protected from surface damage with protective wrap or separation between pieces and shall be handled to avoid edge and corner damage.
+### Material shall not be stored on a slab, against masonry or concrete, or in a space that is not within the specified humidity range.
−### Material that is bowed, cupped, twisted, split, or visibly damaged on delivery shall be rejected and shall not be installed.
+### Material that is bowed, cupped, twisted, split, or damaged on delivery shall be rejected and shall not be installed.
−### Storage on a damp slab or against masonry is a frequent cause of one-sided moisture uptake: trim wicks moisture from the contact face, cups toward the dry side, and arrives at installation already distorted despite a correct shipped moisture content. The flat, supported, off-floor storage requirement above exists to prevent exactly this. {note}
+### The Contractor shall bear the cost of storage, of conditioning during storage, and of replacing material damaged or distorted in storage.
+#### A molding stored on a damp slab takes up water from the face in contact and cups toward the dry side, so it arrives at installation distorted even though its shipped moisture content was correct. Long stock lengths stored on two supports sag between them and take a set, which is why the support runs the full length. {note}
+
+## Protection During Construction {toc}
+
+### The Contractor shall protect installed trim, shelving, and stair parts from damage by other trades until Substantial Completion.
+
+### Protective covering shall not trap moisture against the wood, mark a finished surface, or leave adhesive residue.
+
+### Damage to installed work occurring after installation shall be repaired or the affected member replaced at the Contractor's cost, and a repair shall be indistinguishable from the surrounding work at normal viewing distance.
+
# Warranty {toc}
−## The Contractor shall warrant the installed finish carpentry against defects in installation.
+## The installation warranty period, measured from the date of Substantial Completion, shall be as indicated in the datasheet.
```datasheet
−label: Installation warranty period
−type: radio
+label: Installation Warranty Period
+type: range
+unit: years
options:
− - 1 year
− - 2 years
− - 5 years
−default: 1 year
+ min: 1
+ max: 10
+ setpoints: [1, 2, 3, 5, 10]
+default: 1
+constraint: min
```
−### The Contractor shall warrant the installed work against defects in workmanship - including open joints, nail pops, loose trim, and separation at corners attributable to installation - for a period of not less than one year from substantial completion.
+## The Contractor shall warrant the installation for the specified period against open joints, open miters, loose or detached trim, fastener pops, cupped or bowed members, and shelving or stair parts that loosen in service.
−### Joint opening, cupping, or movement attributable to the building being placed in service outside the specified temperature and humidity range, after acceptance, is excluded from the installation warranty. {note}
+## The Contractor shall correct a deficiency attributable to installation workmanship or to material delivered outside the specified moisture content range at no cost to the Owner, including the cost of refinishing the corrected piece to match and the cost of repairing collateral damage caused by the correction.
−# Spare Parts {toc}
+## The warranty shall exclude movement caused by interior temperature or relative humidity outside the range specified in the datasheet, provided the material was delivered, acclimatized, and installed in compliance with this standard.
−## The Contractor shall furnish attic-stock trim where directed, so that future repairs match the installed profiles.
+## Work corrected under warranty shall carry a fresh warranty of the specified period running from the date of the correction, or the unexpired remainder of the original period, whichever ends later.
−### The Contractor shall furnish attic stock of each installed trim profile, in the specified species and finish state, in a quantity sufficient for future repair and matching.
+# Attic Stock {toc}
+## The quantity of attic stock trim, expressed as a percentage of the installed length of each profile, shall be as indicated in the datasheet.
+
```datasheet
−label: Attic-stock quantity per profile
+label: Attic Stock Trim Quantity
type: range
−unit: linear feet
−min: 0
−max: 100
−step: 10
−default: 20
+unit: '%'
+options:
+ min: 0
+ max: 10
+ step: 1
+default: 0
+constraint: min
```
+
+## Attic stock shall be from the same catalog, species or material, grade, and delivery state as the installed work, in full stock lengths, delivered wrapped and labeled with the profile designation and quantity, and stored where the Owner directs.
+
+### Stock profiles can be reordered by number for as long as the catalog carries them, which is why a project often carries no attic stock for trim at all. A profile that is run in an uncommon species, a factory-finished molding whose color will not be repeated, or a discontinued profile is the case for holding a few lengths, because the replacement would otherwise be a near match set beside the original. {note}