American Wood Council (8140-2041:0004)
This is a listed siding assembly. Listing 8140-2041:0004. This site cites OSFM BML. Match the model and orientation.
Can you use it here?
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Yes, American Wood Council assembly 8140-2041:0004 is listed for wildfire-area use.
CAL FIRE’s Building Materials Listing included it in the September 2025 OSFM WUI Listed Products Handbook, and the live listing still showed it as active on August 25, 2026. The listed expiration date is June 30, 2027. That timeline supports a current listing, not merely an appearance in an older handbook.
The approval applies to a specific siding assembly, not to solid-sawn wood siding generally. The wood must have no through holes or loose knots. It must be installed over structural plywood or oriented strand board at least 7/16 inch thick, with the sheathing complying with Voluntary Product Standard PS1 or PS2. Only the specified interlocking designs are covered, and installation must follow the industrial technical guide and the manufacturer’s instructions.
Before specifying it, confirm the live GOVmotus listing, the exact model, and the assembly details. A matching product name is not enough if the substrate, thickness, wood condition, interlocking design, or installation method differs from the listed configuration.