Across most of the Bay Area’s hillside and canyon neighborhoods — the Oakland and Berkeley hills, Marin, the Santa Cruz Mountains, and the wildland edges of the South Bay — your property sits in a Wildland-Urban Interface (WUI) or a Very High Fire Hazard Severity Zone. In those zones, California Building Code Chapter 7A requires that any roof replacement use a Class A fire-rated assembly (the highest rating — it resists flame spread and burning embers, the #1 way homes ignite in a wildfire).
What that means in practice for a re-roof:
- Class A material or assembly. Most architectural asphalt shingles, concrete and clay tile, and standing-seam metal achieve Class A. Wood shakes do not and are effectively banned on re-roofs in these zones.
- Ember-resistant details. Valley metal, bird-stops at tile eaves, and ember-resistant attic and ridge venting (per 7A) so embers can’t get under the roof or into the attic.
- Class A from the deck up. The rating is for the whole assembly — underlayment and any cap sheet matter, not just the visible shingle.
Even outside a mapped zone, a Class A roof is worth it in our region: many insurers now require it (or surcharge non-Class-A roofs), and after the recent California wildfire seasons it’s a real factor in resale. We pull the permit and build to 7A on every hillside job. Call (415) 410-7917 for a free inspection and a written, code-compliant estimate.
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