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Timber Products' APA 303 shiplap plywood siding is listed for wildfire-area walls with specified veneer layers and a grooved or ungrooved option.
The shiplap description under 8140-2343:0500 sets nominal thickness at 19/32 inch or greater, identified with 19/32 Performance Category. Grooved panels need spacing of at least 4 inches on center; panels without grooves are also included. OSFM describes a 4-by-8-foot panel or a taller panel, preserving the stated width.
For the plywood construction, Douglas fir belongs at the face, back and center, with PS1 Group 2 species in the cross-ply veneers. Match these layer assignments as well as the shiplap edges when selecting the panel. SFM 12-7A-1 is the test protocol recorded by OSFM.
The manufacturer's installation instructions and product data sheets supply further detail. Use them with the nominal-thickness qualification and chosen groove arrangement, then confirm the exact shiplap listing through GOVmotus before specification.
Documented attributes
Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.