COLLINS PRODUCTS, LLC
This is a listed siding assembly. Listing 8140-2025:0006. This site cites OSFM BML. Match the model and orientation.
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Collins' TruWood panel and lap siding are listed for wildfire-area walls when installed over the required Type X gypsum backing.
CAL FIRE listing 8140-2025:0006 covers panel siding in 7/16-inch and 1/2-inch thicknesses, together with lap siding in those same thicknesses. The backing rule applies to every listed option: all siding must be installed over 5/8-inch Type X gypsum wallboard. Switching between panel and lap profiles does not remove that requirement.
The visible siding thickness and the concealed wallboard thickness describe different layers. Keep them separate on a specification, and retain the Type X designation when checking the proposed backing. A TruWood product name or a matching siding thickness alone leaves part of the listed wall assembly unidentified.
Consult the manufacturer's product data sheets alongside its installation instructions, as directed by OSFM. Use those documents to match the exact siding option and the wallboard construction, then confirm listing 8140-2025:0006 in GOVmotus. The listing supports the described wall combinations; it does not establish an unbacked application or a blanket rating for all Collins products.