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Timber Products' Douglas-fir APA 303 reverse-board-and-batten plywood is listed for wildfire-area siding with defined veneers and groove spacing.
Listing 8140-2343:0501 permits nominal thickness of 19/32 inch or greater, using the 19/32 Performance Category designation. Panels may be ungrooved; where grooves are present, they must be at least 12 inches apart on center. The panel size is 4 feet by 8 feet or taller.
Douglas fir veneers form the face, back and center. The cross-ply veneers are PS1 Group 2 species. Those layer assignments distinguish the described plywood from a panel selected only for its reverse-board-and-batten appearance. SFM 12-7A-1 is the named test protocol.
Compare the veneer construction, nominal thickness and groove arrangement with the manufacturer's instructions and product data sheets, then confirm the exact GOVmotus listing. The permission for taller panels and wider groove spacing retains the other stated conditions; it does not replace them.
Documented attributes
Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.
Timber Products Company (8140-2343:0501). FireApproved. https://fireapproved.com/materials/timber-products-company-8140-2343-0501/. Last verified 2026-08-23.