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Royal's 7-inch Clapboard Celect cellular PVC siding is listed for wildfire-area walls with specified gypsum backing, wrap and fastening.
Listing 8140-2339:0500 describes framing made from nominal 2-by-4-inch studs at 16-inch centers. The wall includes 5/8-inch Type X gypsum sheathing, with Tyvek house wrap stapled to that gypsum. Celect siding attaches using galvanized roofing nails 1-1/2 inches long, spaced 16 inches on center.
Celect's cited test protocol is SFM 12-7A-1. Royal's instructions and product data sheet supply the remaining construction details; check those documents against the gypsum, wrap and nail schedule, then confirm the exact GOVmotus listing. The visible clapboard and the specified layers behind it form the wall being cited.
Documented attributes
Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.