United States / Build / Accoya® (Color Grey) is an exterior wall siding made of Acetylated wood
Accoya® (Color Grey) is an exterior wall siding made of Acetylated wood — type figure.
Drawn from this record's own sourced values; every dimension on it is one a
published document states, and a parameter the source did not publish is
named on the drawing rather than estimated.
CC BY 4.0.
Accoya® (Color Grey) is an exterior wall siding made of Acetylated wood
This is a listed siding assembly. Listing 8140-2421:0002. This site cites OSFM BML. Match the model and orientation.
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Yes, Accoya® (Color Grey) acetylated-wood exterior wall siding is listed for wildfire-area use in California.
CAL FIRE’s live Building Materials Listing identifies it as Accsys Technologies PLC listing 8140-2421:0002. Category 8140 covers exterior wall siding and sheathing for the wildland-urban interface.
The listed product is nominally at least 5-41/64 inches wide and 3/4 inch thick. It appeared as listed in the live database on August 25, 2026, with an expiration date of June 30, 2027.
The listing answers the compliance-status question, but its description does not name the test protocol. It therefore establishes that the specified product is currently listed, not what particular fire-performance test it passed. Before specifying it, confirm the test standard and exact covered models on GOVmotus, and make sure the dimensions and Color Grey product match listing 8140-2421:0002. Because listings can change or expire, check the live status again when the siding is selected for a project.
Documented attributes
Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.
Accoya® (Color Grey) is an exterior wall siding made of Acetylated wood. FireApproved. https://fireapproved.com/materials/accsys-technologies-plc-accoya/. Last verified 2026-08-26.
