ROSEBURG FOREST PRODUCTS CO. (8140-2031:0002)
This is a listed siding assembly. Listing 8140-2031:0002. This site cites OSFM BML. Match the model and orientation.
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Roseburg's Douglas Fir shiplap siding is listed for wildfire-area walls over plywood sheathing or directly on studs.
The siding described by 8140-2031:0002 is 19/32 inch thick and APA certified. Its grooves are spaced 12 inches apart, measure 1.5 inches wide and are 3/8 inch deep. Those values describe separate features of the profile; the groove depth does not replace the full siding thickness.
OSFM allows installation over 15/32-inch CDX plywood sheathing or directly to studs. Choose the construction route with the manufacturer's installation instructions and product data sheets in hand, retaining the specified shiplap siding and groove dimensions in either case. No test protocol is named in the complete handbook description. Confirm the Douglas Fir model and current GOVmotus listing before specification; another Roseburg siding profile can have different backing options.