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TruLog Siding has a CAL FIRE OSFM listing as an ignition-resistant material.
Listing 8170-2399:0001 covers specified steel siding and soffit profiles, so the useful specification question is which profile you are buying and whether it matches the listed description.
The steel thickness range is 0.019–0.026 inches. For siding, the named choices are Log Siding Insulated, Lap Siding, and Board & Batten; the soffit choices are Vented Soffit and Unvented Soffit. These are separate profiles within the listing. A product carrying the TruLog name should still be matched to the relevant description and the manufacturer's installation instructions and product data sheets.
OSFM places the products in category 8170, ignition-resistant materials, with ASTM E84 using the extended 20-minute protocol. That establishes the scope of the cited listing. The words “Vented Soffit” identify a profile; they do not establish an ember-resistant vent test result or a rating for a complete wall assembly. Use the listing to select the specified steel product, and check the live BML record when making that selection.
Documented attributes
Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.