California Building Code Chapter 7A applies to new construction and major remodels in Twain Harte's Wildland-Urban Interface. Roofs, vents, eaves, decks, siding, and windows must use ignition-resistant materials and assemblies.
Because Twain Harte sits in a Cal Fire-mapped Fire Hazard Severity Zone, CBC Chapter 7A requires Class A roof assemblies, ember-resistant attic and foundation vents, non-combustible or ignition-resistant siding, dual-pane windows with at least one tempered pane, enclosed eaves, and ignition-resistant deck materials. The California Energy Code (Title 24 Part 6) and CALGreen also apply, layering insulation, glazing, and water-efficiency requirements. Tuolumne County Building Department reviews plans for compliance. Voluntary hardening of older homes is encouraged through state programs and can lower insurance costs.
Plan-check denial; corrections during inspection; no final occupancy without compliant assemblies; insurance impacts on non-hardened structures.
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Twain Harte, CA
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