Nusku Partners LLC (8140-2064:0101)
This is a listed siding assembly. Listing 8140-2064:0101. This site cites OSFM BML. Match the model and orientation.
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NuSku Fireblocker tongue-and-groove redwood wall siding is listed with a profile schedule, size minimums and required backing.
The fingerjoint redwood in 8140-2064:0101 must be free of holes and knots. Its minimum nominal dimensions are 1 inch in thickness and 6 inches in width, and both limits apply. Underneath it, OSFM permits oriented strand board, plywood or gypsum at a minimum thickness of 7/16 inch.
Examples from the listing's CRA #17 schedule are pattern #711 at 1 by 6 inches, #712 at 1 by 8 inches and #713 at 1 by 10 inches. The pattern number identifies more than a nominal board size: the purchase needs to match the listed tongue-and-groove profile. These examples are part of the schedule, not its complete contents.
Ask for the proposed pattern and supporting layer to be identified in the wall specification. Then compare them with the corresponding GOVmotus record and obtain the installation instructions and product data sheets referenced by OSFM. This keeps the joint profile and the concealed backing in the same assembly review.