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Interior Architectural Woodwork

Written and maintained by SynC.

Rev3
IssuedAug 26, 2026
LicenseCC BY 4.0
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1 Scope

NOTE This standard governs interior architectural woodwork furnished under a single millwork contract that spans multiple AWI product types, including custom paneling, standing and running trim, specialty and integrated casework, freestanding built-ins, ornamental woodwork, shelving systems, wainscot, decorative columns and pilasters, and bespoke assemblies such as reception environments and boardroom paneling packages. (1.1)
1.2 The work includes all shop fabrication, factory finishing where specified, fire-retardant treatment, concealed blocking coordination, field installation, and the AWI Quality Certification Program (QCP) project certification where required.
NOTE This standard serves the umbrella or master role when one millwork contractor is responsible for all interior AWI-graded products on a project, and for integrated specialty assemblies that blend paneling, trim, casework, and ornamental elements into a single coordinated scope. (1.3)
NOTE Where a single woodwork type is bid as a standalone scope, the narrower standard governs that scope: stock catalog trim field-installed without shop drawings is Finish CarpentryFinish CarpentryResolves to the current adopted revision.sync/finish-carpentry; custom shop-fabricated trim and paneling as a standalone package is Architectural Wood Trim And PanelingArchitectural Wood Trim and PanelingResolves to the current adopted revision.sync/architectural-wood-trim-and-paneling; factory-fabricated cabinetry is Wood And Laminate CaseworkWood and Laminate CaseworkResolves to the current adopted revision.sync/wood-and-laminate-casework. (1.4)
NOTE Concealed structural framing, blocking installed by the framing trade, wood doors and frames (Doors Frames And HardwareDoors, Frames, and HardwareResolves to the current adopted revision.sync/doors-frames-and-hardware), gypsum-board assemblies (Gypsum Board AssembliesGypsum Board AssembliesResolves to the current adopted revision.sync/gypsum-board-assemblies), firestopping (FirestoppingFirestoppingResolves to the current adopted revision.sync/firestopping), and field painting by the painting trade (Interior PaintingInterior PaintingResolves to the current adopted revision.sync/interior-painting) are coordinated by but not furnished under this standard. (1.5)
1.6 The governing AWI quality grade — Economy, Custom, or Premium — shall be specified per area or per element type and shall not be applied as a single blanket grade across the entire project.

2 Referenced Standards

2.1 Woodwork, materials, treatment, and installation shall comply with the latest adopted edition of each of the following unless a specific edition is cited.
2.2 Where referenced standards conflict, the more stringent requirement shall govern unless the Architect or Engineer of Record directs otherwise in writing.
NOTE The ANSI/AWI product standards became effective November 15, 2024 and supersede the corresponding sections of the legacy AWI/AWMAC/WI Architectural Woodwork Standards, Second Edition (2014); where a contract still cites AWS Ed. 2, the current ANSI/AWI product standard governs the affected product. (2.3)
Standard Title
ANSI/AWI 0622.0646–2024 Millwork and Wood Trim
ANSI/AWI 0642–2024 Wood Paneling
ANSI/AWI 0641–2019 Architectural Wood Casework
ANSI/AWI 0620–2024 Finish Carpentry / Installation
AWI/AWMAC/WI AWS Ed. 2 Architectural Woodwork Standards, Second Edition (legacy quality framework)
ANSI/HPVA HP-1 Standard for Hardwood and Decorative Plywood
ANSI A208.1 Particleboard
ANSI A208.2 Medium Density Fiberboard (MDF) for Interior Applications
ASTM E84 Surface Burning Characteristics of Building Materials
UL 723 Test for Surface Burning Characteristics of Building Materials
NFPA 286 Fire Tests for Evaluating Contribution of Wall and Ceiling Interior Finish to Room Fire Growth
AWPA U1 Use Category System: User Specification for Treated Wood
EPA 40 CFR Part 770 Formaldehyde Emission Standards for Composite Wood Products (TSCA Title VI)
CARB ATCM 93120 Airborne Toxic Control Measure for Composite Wood Products, Phase 2
NEMA LD 3 High Pressure Decorative Laminates
ICC A117.1 Accessible and Usable Buildings and Facilities
IBC International Building Code (Sections 803 and 806, interior finish and trim)

3 Submittals

3.1 Action Submittals

3.1.1 The Contractor shall submit the following action submittals for review before fabrication:
  • Product data for each species, panel core, adhesive, finish system, fire-retardant treatment, and hardware item.
  • Shop drawings showing every woodwork type, drawn at a scale adequate to convey joinery, with plans, elevations, sections, and large-scale details of profiles, panel modules, reveals, and connections.
  • Panel sequence elevations identifying the assembly sequence and flitch assignment for every veneered paneling run.
  • Samples of each species and finish, including transparent and opaque finish sample sets at the specified sheen.
  • A blocking and backing schedule coordinated with the framing trade, keyed to the woodwork elevations.
  • AWI quality grade designation for each area or element type, keyed to the room finish schedule.
Action Submittals Requiredcheckbox
☑ Product data (species, core, adhesive, finish, treatment, hardware)
☑ Shop drawings (plans, elevations, sections, large-scale details)
☑ Panel sequence elevations with flitch assignment
☑ Species and finish samples (transparent and opaque sets)
☑ Blocking and backing schedule
☑ AWI quality grade designation per area or element
3.1.2 Veneer-faced paneling samples shall be a minimum of 12 in. by 12 in. and shall represent the specified veneer cut, match, and finish.
3.1.3 Mockups shall be provided for Premium-grade assemblies and for any reception, boardroom, or liturgical package when required by the contract documents.
Veneer Sample Size (minimum)range
in
824
Default: 12 in

3.2 Informational Submittals

3.2.1 The Contractor shall submit the following informational submittals for the record:
  • AWI-QCP shop certification or pre-qualification evidence where project certification is required.
  • Formaldehyde-emission compliance documentation (TSCA Title VI and, where required, CARB Phase 2) for every composite wood panel product.
  • Fire-retardant treatment certification, including kiln-dried-after-treatment (KDAT) documentation where a transparent finish is specified.
  • ASTM E84 or NFPA 286 test reports for woodwork regulated as interior wall or ceiling finish.
  • Moisture-content records at delivery for representative lots.
Informational Submittals Requiredcheckbox
☐ AWI-QCP shop certification / pre-qualification
☑ Formaldehyde-emission compliance (TSCA Title VI / CARB Phase 2)
☑ Fire-retardant treatment certification (incl. KDAT)
☑ ASTM E84 or NFPA 286 fire test reports
☑ Moisture-content records at delivery

3.3 Closeout Submittals

3.3.1 The Contractor shall submit the following closeout submittals before final acceptance:
  • Maintenance and care instructions for each finish system.
  • Touch-up finish materials and stain or paint records matched to the installed work.
  • Written warranty documentation executed by the millwork contractor.
Closeout Submittals Requiredcheckbox
☑ Maintenance and care instructions per finish system
☑ Touch-up finish materials and color records
☑ Executed warranty documentation

4 Quality Assurance

4.1 AWI Quality Grades

NOTE The AWI quality grade establishes the workmanship, material, and tolerance level for each woodwork element; Economy is the lowest grade, Custom is the typical commercial grade, and Premium is the highest grade reserved for the most visible work. (4.1.1)
NOTE Custom grade is the default for the majority of commercial woodwork; Economy grade is appropriate only for back-of-house, mechanical, and concealed areas; Premium grade is selected only for reception, boardroom, executive, and ceremonial spaces where it is justified by visibility. (4.1.2)
4.1.3 Each woodwork element shall be furnished to the AWI quality grade specified for its area or element type in the contract documents.
4.1.4 Where no grade is specified for an element, Custom grade shall govern.
Default AWI Quality Grade (general commercial areas)radio
○ Economy
● Custom
○ Premium
AWI Quality Grade — Premium Areas (reception, boardroom, executive)radio
○ Custom
● Premium
AWI Quality Grade — Back-of-House and Concealed Areasradio
● Economy
○ Custom

4.2 AWI Quality Certification Program

NOTE The AWI Quality Certification Program (QCP) is a third-party program under which a certified shop attests that the furnished woodwork meets the specified AWI grade; project certification requires the contractor to be pre-qualified before award. (4.2.1)
NOTE Requiring QCP certification without confirming that QCP-certified contractors are available in the project's market can reduce the bidder pool to zero; verify local availability before making certification mandatory, and provide a pre-bid waiver path where availability is thin. (4.2.2)
4.2.3 Where QCP project certification is required, the millwork contractor shall be a QCP-certified shop verified through the AWI-QCP registry before contract award.
4.2.4 Where QCP project certification is required, the Contractor shall furnish QCP certification documentation for the completed project at closeout.
AWI-QCP Project Certificationradio
○ Required
● Optional
○ Not required

4.3 Single-Source Responsibility

NOTE When this standard is used as the umbrella specification, a single millwork contractor is responsible for all interior AWI-graded woodwork, eliminating the seams and finger-pointing that arise when trim, paneling, and casework are split across separate trade packages. (4.3.1)
4.3.2 All interior architectural woodwork on the project shall be furnished and installed by a single millwork contractor unless the contract documents expressly divide the scope into separate packages.

5 Environmental and Service Conditions

5.1 Moisture Content and Acclimatization

NOTE Wood is hygroscopic and moves with changes in ambient humidity; delivering or installing woodwork before the building is dried in and HVAC is operational causes racking, twisting, and cracking that no amount of fabrication quality can prevent. (5.1.1)
5.1.2 The interior equilibrium moisture content (EMC) target for HVAC-controlled commercial interiors at 40–50% relative humidity is 7–8%; the delivered moisture content shall fall within the range required for the project's service environment.
5.1.3 Woodwork shall be delivered at a moisture content of 6–9% for interior service environments unless a different range is required by the project's documented conditions.
5.1.4 Woodwork shall not be delivered to the site until the building is enclosed, weathertight, and maintained at the service temperature and humidity by an operating HVAC system.
5.1.5 Woodwork shall be acclimatized in the installation space for a minimum of 72 hours before installation in a temperature- and humidity-controlled environment.
Moisture Content at Deliveryrange
%
56912
Acclimatization Period Before Installation (minimum)range
hr
24168
Default: 72 hr
Service Environment Relative Humidity (design)range
%
25405065

6 Fire Performance

6.1 Interior Finish Classification

NOTE Architectural woodwork that functions as interior wall or ceiling finish is regulated by IBC Section 803 and shall be tested to ASTM E84 (or the equivalent UL 723) for flame spread index and smoke developed index. (6.1.1)
NOTE IBC Section 806 exempts trim that is not more than 4 in. wide and does not cover more than 10% of the wall or ceiling area in any room from the interior-finish flame-spread classification; elements wider than that limit, or in greater aggregate area, are regulated finish and shall be tested. (6.1.2)
NOTE Flame spread classes are Class A (FSI 0–25), Class B (FSI 26–75), and Class C (FSI 76–200); the required class depends on occupancy group, space type, and sprinkler status per IBC Table 803.13, with Class A commonly required in corridors, exit enclosures, and assembly and healthcare occupancies. (6.1.3)
6.1.4 The smoke developed index shall not exceed 450 for all flame spread classes when tested to ASTM E84.
6.1.5 Regulated interior-finish woodwork shall meet the flame spread class required for its occupancy group and space type per IBC Section 803 and Table 803.13.
6.1.6 Where a spray-applied or intumescent fire-retardant coating is used, or where a product cannot be reliably tested in the ASTM E84 tunnel, compliance may be demonstrated by NFPA 286 room-corner testing as an alternative path to Class A.
Required Flame Spread Class (regulated finish woodwork)radio
○ Class A (FSI 0-25)
● Class B (FSI 26-75)
○ Class C (FSI 76-200)
Maximum Smoke Developed Index (ASTM E84)range
SDI
0450
Default: 450 SDI
Fire Compliance Test Methodradio
● ASTM E84 (UL 723) tunnel test
○ NFPA 286 room-corner test

6.2 Fire-Retardant Treatment

NOTE Where the required flame spread class cannot be met by the untreated wood species, fire-retardant treatment is provided either by pressure-impregnated fire-retardant-treated wood (FRTW) per AWPA U1 Use Category UCFA, or by a surface-applied intumescent coating; the choice affects finish compatibility. (6.2.1)
NOTE Non-KDAT fire-retardant-treated wood retains hygroscopic treatment salts that exude to the surface and bleed through a transparent finish, causing discoloration and delamination; this is the single most common fire-treatment failure in finish woodwork. (6.2.2)
6.2.3 Pressure-impregnated FRTW shall conform to AWPA U1, Use Category UCFA, for interior above-ground service.
6.2.4 Fire-retardant-treated wood receiving a transparent finish shall be kiln-dried after treatment (KDAT) to remove free moisture and stabilize the treatment salts.
6.2.5 Where a surface-applied intumescent coating is used, the coating system shall be compatible with the specified finish system and the finish manufacturer's written approval shall be obtained.
Fire-Retardant Treatment Methodradio
● None (untreated species meets class)
○ Pressure-impregnated FRTW (KDAT)
○ Surface-applied intumescent coating

7 Solid Lumber

NOTE Solid lumber species and grade determine appearance, hardness, and finish behavior; the species shall be selected for compatibility with the specified transparent or opaque finish and the wear demands of the space. (7.1)
7.2 Solid lumber shall be of the species and grade specified, kiln-dried to the moisture content required for the service environment, and free of defects exceeding the allowance for the specified AWI grade.
Solid Lumber Speciesselect
White Oak
Red Oak
Hard Maple
Cherry
Walnut
Mahogany
Poplar (paint grade)
Soft Maple (paint grade)

8 Veneer and Panel Faces

NOTE Veneer cut and match govern the figure and rhythm of a paneled wall; plain-sliced, quarter-sliced, rift-cut, and rotary cuts produce distinct grain, and book, slip, and random match arrange the leaves differently across each panel face. (8.1)
NOTE Without a panel sequence elevation on the drawings, the fabricator cannot match veneer across a wall and the installed result rarely satisfies the design intent regardless of the grade specified; the sequence is a drawing responsibility, not a fabrication assumption. (8.2)
8.3 Plywood used for veneer-faced paneling and panel components shall conform to ANSI/HPVA HP-1 for veneer grade, core construction, and matching.
8.4 Veneer-faced paneling shall be fabricated to the cut, match, and assembly sequence shown on the approved panel sequence elevations.
8.5 For Premium-grade veneer paneling, all panels within a sequence shall be from the same flitch, and color or grain deviation shall not be visible at 6 ft under normal lighting.
Veneer Speciesselect
White Oak
Rift White Oak
Walnut
Cherry
Anigre
Sapele
Maple
Teak
Veneer Cutradio
● Plain-sliced
○ Quarter-sliced
○ Rift-cut
○ Rotary
Veneer Match (within panel face)radio
● Book match
○ Slip match
○ Random match
Panel Assembly Sequence (across elevation)radio
○ Running match
● Balanced match
○ Center-balanced match

9 Panel Core Materials

NOTE Panel core selection trades off flatness, screw-holding, weight, and cost; particleboard and MDF give the flattest faces for veneer and laminate, veneer core gives the best screw-holding and lightest weight, and combination cores balance the two. (9.1)
NOTE Composite wood panels (particleboard, MDF, hardwood plywood) shall comply with the formaldehyde-emission limits of EPA 40 CFR Part 770 (TSCA Title VI); CARB Phase 2 compliance satisfies Title VI and shall be provided where required by the project or its green-building program. (9.2)
9.3 Particleboard cores shall conform to ANSI A208.1.
9.4 MDF cores shall conform to ANSI A208.2.
9.5 All composite wood panel products shall be TSCA Title VI compliant, with documented emission limits not exceeding 0.05 ppm for hardwood plywood, 0.09 ppm for particleboard, and 0.11 ppm for MDF.
Panel Core Materialselect
Particleboard (ANSI A208.1)
MDF (ANSI A208.2)
Veneer core
Combination core
Formaldehyde Emission Compliance Tierradio
● TSCA Title VI
○ TSCA Title VI + CARB Phase 2

10 Fabrication and Construction

10.1 Tolerances

NOTE Flatness and joint tolerances are graded; a tolerance acceptable at Custom grade reads as a defect at Premium, which is why the grade must be assigned per element rather than blanket. (10.1.1)
10.1.2 Custom-grade wall panels shall not deviate from plane by more than 1/8 in. in any 8 ft run.
10.1.3 Reveal and shadow-line joints between flush panel modules shall be held to the dimension shown on the approved shop drawings, within the tolerance for the specified AWI grade.
Reveal / Shadow-Line Joint Width (flush panel modules)range
in
0.06250.18750.25
Wall Panel Flatness Tolerance (max deviation per 8 ft)range
in
0.06250.25
Default: 0.125 in

10.2 Integrated and Specialty Assemblies

NOTE Integrated assemblies such as reception environments and boardroom packages combine a casework base, veneer-faced panel faces, a transaction counter, and back-wall paneling into one engineered unit; the value of the umbrella contract is that one fabricator coordinates these interfaces rather than three trades meeting at a joint. (10.2.1)
10.2.2 The interface between paneling and casework at toe-kick and base conditions shall be detailed on the shop drawings as a defined gap, scribe, or reveal; an undetailed junction becomes a punch-list dispute.
10.2.3 Integrated specialty casework incorporated into the woodwork package shall be fabricated to ANSI/AWI 0641 and to the AWI grade specified for the assembly.
10.2.4 Where an integrated assembly carries a work surface, the countertop material shall be as specified.
10.2.5 Where a solid-surface work surface is included in the integrated assembly, the millwork contractor shall coordinate the countertop scope with Solid Surface CountertopsSolid Surface and Quartz CountertopsResolves to the current adopted revision.sync/solid-surface-countertops.
10.2.6 Where an integrated assembly includes an LED reveal, light cove, or under-counter lighting, the millwork contractor shall provide the routed channel and pre-installed raceway.
10.2.7 The millwork contractor shall coordinate the electrical rough-in and conduit sleeves with the electrical trade for all integrated lighting provisions.
10.2.8 Transaction counters and built-in work surfaces serving the public shall comply with the reach-range and knee-clearance requirements of ICC A117.1 where accessibility applies.
Integrated Assembly Work Surfaceselect
None
Wood / veneer
Plastic laminate (NEMA LD 3)
Solid surface
Stone
Integrated LED Lighting Provisionradio
● None
○ LED reveal / light cove
○ Under-counter lighting
○ Both reveal and under-counter

10.3 Hardware

10.3.1 Specialty casework integrated into the woodwork package carries operating hardware — hinges, slides, locks, and pulls — that may be specified within the woodwork scope or deferred to a separate hardware schedule; the boundary shall be stated explicitly to avoid a gap.
10.3.2 Operating hardware for integrated casework components shall be furnished and installed by the millwork contractor unless the contract documents assign it to a separate hardware schedule.
Integrated Casework Hardware Responsibilityradio
● Furnished under woodwork scope
○ Deferred to hardware schedule

11 Finishes

11.1 Finish System

NOTE The finish system is transparent (clear, showing the wood) or opaque (painted, concealing the wood), and is applied either in the shop (factory finish, the most controlled) or in the field; the choice drives species, core, and coordination with the painting trade. (11.1.1)
11.1.2 Specifying a factory finish on woodwork that the painting trade will field-paint creates a double-finish conflict; where finish scope is split, the split shall be stated explicitly in both this standard and Interior PaintingInterior PaintingResolves to the current adopted revision.sync/interior-painting.
11.1.3 Transparent factory finishes shall receive a minimum of one sealer coat plus two topcoat applications.
11.1.4 Opaque factory finishes shall receive a minimum of one primer coat plus two topcoat applications.
11.1.5 The finish sheen shall be as specified, with satin (20–35 gloss units) as the typical commercial selection.
Finish Typeradio
● Transparent (clear)
○ Opaque (painted)
Finish Applicationradio
● Factory-applied (shop finish)
○ Field-finished
Finish Sheenradio
● Satin (20-35 gloss units)
○ Semi-gloss
○ Gloss
Transparent Finish Topcoats (minimum, over sealer)range
coats
14
Default: 2 coats

12 Installation

12.1 Blocking and Backing

12.1.1 AWI paneling and heavy ornamental assemblies require robust concealed backing that cannot be added after the drywall is closed; the blocking plan must be generated before MEP rough-in and coordinated with the framing trade, or the only remedy at install is to open finished walls.
12.1.2 A blocking and backing schedule shall be coordinated with the framing trade and installed before gypsum-board assemblies are closed, per Gypsum Board AssembliesGypsum Board AssembliesResolves to the current adopted revision.sync/gypsum-board-assemblies.
12.1.3 Concealed blocking shall be provided at every paneling run, freestanding built-in, heavy ornamental assembly, and wall-hung casework unit at the locations shown on the woodwork blocking plan.
Wood species and finishtext
Enter value...
Per drawings — woodwork blocking plan (deferred by default)

12.2 Field Installation

12.2.1 Installation workmanship, field tolerances, and scribing shall conform to ANSI/AWI 0620 at the AWI grade specified for each element.
12.2.2 Woodwork shall be installed plumb, level, and true to line, scribed to adjoining surfaces, and secured to the concealed blocking with the fastening method specified for the element.
12.2.3 Fasteners shall be concealed by the specified method — hidden mechanical fasteners, French cleats, proprietary hanging systems, or face-nailing with set and filled holes — appropriate to the element and its AWI grade.
Primary Concealed Fastening Methodradio
● Hidden mechanical fasteners / clips
○ French cleats
○ Proprietary panel hanging system
○ Face-nail, set and fill

13 Delivery, Storage, and Handling

13.1 Delivery Sequencing

NOTE Large-package millwork contracts require deliveries sequenced to the construction schedule so that finished woodwork is not staged for weeks in active work areas where it can be damaged or exposed to humidity swings. (13.1.1)
13.1.2 Woodwork shall be delivered in the sequence required by the construction schedule and only after the receiving space is enclosed, conditioned, and ready to receive the work.
13.1.3 Woodwork shall be stored flat or vertically as appropriate to the element, protected from moisture, physical damage, and direct sunlight, in the conditioned service environment.
13.1.4 Shop drawings shall be submitted approximately 6–8 weeks before the required fabrication date to allow a 10–15 business-day review period per submittal cycle without delaying the schedule.
Shop Drawing Submission Lead Time (before fabrication)range
weeks
46812
Submittal Review Period (per cycle)range
business days
5101520

14 Warranty

14.1 The millwork contractor shall warrant the interior architectural woodwork against defects in materials and workmanship, including delamination, warping, joint separation, and finish failure under normal interior service conditions, for the warranty period specified below.
14.2 Warranty repairs shall include refinishing or replacement of affected woodwork to match the adjacent installed work.
Warranty Periodradio
● 1 year
○ 2 years
○ 5 years

15 Spare Parts

15.1 The Contractor shall deliver touch-up finish materials and a record of the stain or paint formulation matched to each installed finish system.
15.2 The Contractor shall deliver attic-stock veneer or finish samples for each Premium-grade assembly where required by the contract documents.
Attic Stock Requiredcheckbox
☑ Touch-up finish materials per system
☑ Stain / paint formulation records
☐ Premium-grade veneer / finish samples

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"Interior Architectural Woodwork," SynC Standards, revision 3. Licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://synergyinconstruction.com/standards/general/interior-architectural-woodwork. Reference material only; not professional engineering advice and provided without warranty. Verify against governing codes and have a licensed professional review before use.