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Accoya tongue-and-groove and Color Grey acetylated-wood siding

Name: Accoya tongue-and-groove and Color Grey acetylated-wood siding
Brand: Accsys Technologies PLC

This is a listed siding assembly. Listing 8140-2421:0001. This site cites cal-fire-bml. Match the model and orientation. A listing is not a permit.

Accoya is acetylated wood used for exterior siding. Current CAL FIRE OSFM listings 8140-2421:0001 and 8140-2421:0002 cover tongue-and-groove and Color Grey boards, respectively, in a specified wall assembly with DensGlass Gold sheathing, sealed joints, a one-inch air cavity, and prescribed framing and fastening. The listings do not identify a test protocol.

Kind: listed-assembly. Brand: Accsys Technologies PLC. Listing evidence: OSFM WUI handbook 2026-08-25. Page reviewed 2026-08-25. JSON (CC BY 4.0)

Documented attributes

Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.

Attribute	Value	Evidence source
Material	wood	Accoya siding (manufacturer)

Program	ID / source	Evidence date	Expires	Status
CAL FIRE BML	8140-2421:0001 · Search BML for 8140-2421:0001	2026-08-25	2027-06-30	listed
CAL FIRE BML	8140-2421:0002 · Search BML for 8140-2421:0002	2026-08-25	2027-06-30	listed

Tests and programs cited

OSFM BML · listing-program

Models named on the listing

Model	Application
Accoya tongue-and-groove siding	nominal 5-41/64-inch width; 3/4- or 1-inch thickness in the listed wall assembly
Accoya Color Grey siding	minimum nominal 5-41/64-inch width and 3/4-inch thickness in the listed wall assembly

These listings cover complete wall assemblies, not loose Accoya boards. Match the exact model and thickness, 2-by-4 framing and bracing, 5/8-inch DensGlass Gold, sealed sheathing gaps, one-inch cavity, orientation, and fastening to the current listing and installation documents.
The live BML records name no test protocol. Do not infer one from other Accoya literature.
OSFM listing is not a permit. The authority having jurisdiction decides.

Can I use this here

This trace joins product evidence to a sourced code application, then keeps every boundary, map, date, project check, documented constraint match, and still-undocumented field visible. It is not a permit result. Full explorer: Can I use this here.

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The rule and every matching product for the United States

Requirement constraints (16)

Each table below compares this product's documented attributes against one published requirement. That comparison is a fact about the product and the requirement, and does not change from place to place, so it is printed once.

Requirement constraints (16)

Each table compares this product's documented attributes with one published requirement. That comparison does not change from place to place, so it is printed once here and linked from every jurisdiction below.

ORSC R327 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

IWUIC Class 1–2 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

IWUIC Class 1 wall-base protection undocumented
Field	Required	Documented value	State
Assembly role	Assembly role = wall base protection	Not documented	undocumented
Height	Height ≥ 6 in	Not documented	undocumented
Noncombustible	Noncombustible = Yes	Not documented	undocumented

California noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

California one-hour exterior wall undocumented
Field	Required	Documented value	State
Fire resistance	Fire resistance ≥ 60 min	Not documented	undocumented

California SFM 12-7A-1 wall undocumented
Field	Required	Documented value	State
Test standard	Test standard = sfm 12 7a 1	Not documented	undocumented

Colorado CWRC noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

Colorado CWRC wall-base protection undocumented
Field	Required	Documented value	State
Assembly role	Assembly role = wall base protection	Not documented	undocumented
Height	Height ≥ 6 in	Not documented	undocumented
Noncombustible	Noncombustible = Yes	Not documented	undocumented

2018 IWUIC Class 1–2 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

Kittitas IR1 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

Kittitas IR1 one-hour wall undocumented
Field	Required	Documented value	State
Fire resistance	Fire resistance ≥ 60 min	Not documented	undocumented

Kittitas Table 503.1 N.C. wall undocumented
Field	Required	Documented value	State
Fire resistance	Fire resistance ≥ 60 min	Not documented	undocumented
Noncombustible	Noncombustible = Yes	Not documented	undocumented

2021 IWUIC Class 1–2 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

2006 Utah UWUI Class 1–2 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

2006 Utah UWUI Class 1–2 one-hour wall undocumented
Field	Required	Documented value	State
Fire resistance	Fire resistance ≥ 60 min	Not documented	undocumented

2006 Utah UWUI Table 503.1 N.C. wall undocumented
Field	Required	Documented value	State
Fire resistance	Fire resistance ≥ 60 min	Not documented	undocumented
Noncombustible	Noncombustible = Yes	Not documented	undocumented

Where this applies

A product is a national record; where it applies is a fact about a place. The rule that binds a given address — and every product matching it — is published on that place's own answer page, linked above and re-linked by the location lens. The complete per-place claim graph for this record, including every open official check, is in its JSON twin.

Sources

OSFM Building Materials Listing (live database) — CAL FIRE OSFM (listing-body). Accessed 2026-08-25.
Accoya siding — Accoya (manufacturer). Accessed 2026-08-25.
Accoya Color Grey siding — Accoya (manufacturer). Accessed 2026-08-25.
Accoya cladding profile drawings — Accoya (manufacturer). Accessed 2026-08-25.

Accoya tongue-and-groove and Color Grey acetylated-wood siding. FireApproved. https://fireapproved.com/materials/accsys-technologies-plc-accoya-tongue-groove-exterior-wall-siding/. Last verified 2026-08-25.