CEDAR VALLEY MANUFACTURING
This is a listed siding assembly. Listing 8140-2023:0002. This site cites OSFM BML. Match the model and orientation.
Can you use it here?
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Yes, but only the specified Cedar Valley “California Stack” cedar-shingle siding assembly.
Under number 8140-2023:0002, CAL FIRE’s Building Materials Listing identifies the Cedar Valley “California Stack” 1-Course Cedar Shingle Siding Panel; the live listing status on August 25, 2026, shows an expiration date of June 30, 2027.
The listing applies to a defined assembly: Western red cedar vertical-grain heartwood shingles over fiberglass matte on a square-cut plywood backer. The panel must have an exposure of 4-1/4 inches or greater and be installed over oriented strand board at least 7/16 inch thick. Those construction details establish the scope of the listing; the company name alone does not extend it to other Cedar Valley products or configurations. Before specifying the siding, confirm the exact model in the live record and follow the manufacturer’s installation instructions and product data sheets.