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Swanson's Douglas-fir veneer plywood is listed as direct-attached wall siding with a specified stud and nailing arrangement.
OSFM 8140-2137:0501 identifies a nominally 19/32-inch-thick panel with Douglas-fir front, back and center veneers. The construction has 5 plies and 5 layers, with panel sizes of 4 by 8 feet, 4 by 9 feet or 4 by 10 feet. OSFM specifies groove lengths of 4, 6 or 8 inches. These details distinguish the panel covered by this listing from an unspecified sheet of plywood.
The siding attaches to nominal 2-by-4-inch studs spaced at 16-inch centers. OSFM records 6d nails at 6-inch spacing along panel edges and 12-inch spacing in the field. Stud spacing and the two fastening intervals belong with the panel selection when preparing the wall detail.
SFM 12-7A-1 is the handbook's stated test protocol. The retained BML description repeats the panel construction and fastening arrangement, providing a matching listed assembly to check. Use Swanson's installation instructions and product data sheets for the remaining construction details, and confirm the exact GOVmotus entry before specification.
Documented attributes
Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.
Swanson Group Mfg. LLC (8140-2137:0501). FireApproved. https://fireapproved.com/materials/swanson-group-mfg-llc-8140-2137-0501/. Last verified 2026-08-23.