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D4STD Market Square Double 4-inch vinyl siding with PVC capstock is listed for wildfire-area walls as a specified backed assembly.
OSFM's 8140-2339:0501 description places this siding over 5/8-inch Type X gypsum sheathing on nominal 2-by-4-inch studs set 16 inches on center. Tyvek house wrap is stapled to the gypsum. For the siding attachment, the listed fasteners are 1-1/2-inch galvanized roofing nails, also at 16-inch spacing.
Both the model code and PVC capstock distinguish the Market Square product being cited. The listed nail schedule does not remove the gypsum or house-wrap conditions; they form the same wall detail tested under SFM 12-7A-1. Match that full construction to Royal's installation instructions and product data sheet, then confirm D4STD's current GOVmotus listing. Comparing the D4STD model name alone would leave the concealed gypsum and house-wrap layers unconfirmed.
Documented attributes
Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.