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Martco's APA 303 shiplap plywood siding is listed for wildfire-area walls in the specified panel and veneer configurations.
Listing 8140-2138:0100 sets the thickness at nominal 19/32 inch or greater and gives 19/32 as the Performance Category. Grooves must be at least 4 inches apart on center, or the panels may be ungrooved. The panel size is 4 by 8 feet. These qualifications belong together; the performance-category designation is not an assertion of exact measured thickness.
The veneer construction may be all Southern Pine. The other described construction has Douglas fir at the face, back and center, with cross plies made from PS1 Group 1 or 2 species. Match the veneer arrangement as well as the shiplap edge and groove pattern when reviewing a panel for this listing.
OSFM identifies SFM 12-7A-1 as the test protocol. For specification, obtain Martco's installation instructions and product data sheets and compare the proposed panel with the listed construction. Confirm the live GOVmotus entry before relying on it. An APA 303 label alone leaves the thickness category, groove spacing and veneer choices still to check.
Documented attributes
Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.