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Yes, Nusku Partners LLC listing 8140-2064:0501 is listed for wildfire-area use as a siding assembly.
CAL FIRE’s Office of the State Fire Marshal includes it in category 8140 under the SFM 12-7A-1 test protocol. The September 2, 2025 WUI Listed Products Handbook carried the listing; the live BML still showed it on August 25, 2026, expiring June 30, 2027.
The approval is specific to Thermally Modified Ash Nusku Thermacor Siding. It covers nominal 1-by-6-inch material installed horizontally with a maximum 1-inch shiplap. Those dimensions and installation conditions define the listed assembly; the listing does not establish approval for other Nusku products, sizes, or configurations.
Before specification, match the Thermacor siding model to listing 8140-2064:0501 and consult the manufacturer’s instructions and product data sheets for installation. The live listing should also be confirmed before purchase or installation, particularly after its stated expiration date.
Documented attributes
Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.