Sonoma County homeowners know better than most how devastating wildfires can be. The 2017 Tubbs Fire destroyed more than 5,600 structures in Santa Rosa alone. Fire-resistant roofing is one of the most important investments a Sonoma County homeowner can make — and since 2008, California building codes have required Class A fire-rated roofing systems in designated fire hazard severity zones. Sutter Roofing Systems installs fire-rated replacement roofs and metal roofing systems that meet and exceed state requirements.
Understanding Fire Ratings: Class A, B, and C
Roofing materials in the United States are rated for fire resistance under ASTM E-108 and UL 790 standards. The rating system works as follows:
- Class A: The highest rating. Effective against severe fire exposure. Can withstand burning brands landing on the roof. Required in California's Very High Fire Hazard Severity Zones (VHFHSZ).
- Class B: Effective against moderate fire exposure. Not sufficient for high-risk fire zones in California.
- Class C: Effective against light fire exposure. The minimum acceptable rating for any occupied structure in California.
Since 2008, California Building Code requires Class A rated roofing assemblies in all State Responsibility Areas (SRAs) and locally designated fire zones. Many areas of Sonoma County — including communities in the hills east of Santa Rosa, areas near Fountaingrove, and rural communities near Healdsburg and Petaluma — fall within these requirements.
Top Fire-Resistant Roofing Materials for California
Class A Fire-Rated Asphalt Shingles
Modern architectural asphalt shingles with Class A ratings use fiberglass mat cores rather than organic felt — the fiberglass mat itself is non-combustible. When these shingles are installed with a fire-rated underlayment, the complete assembly achieves Class A status. They offer excellent value for fire protection, a wide range of colors and profiles, and are the most commonly installed roofing material in California at approximately 54–58% market share.
Cost for Class A rated asphalt shingles typically runs $3–$5 per square foot for materials, with installation adding $2–$4 per square foot depending on roof complexity.
Metal Roofing
Metal roofing is inherently non-combustible — it simply cannot catch fire from airborne embers or direct flame contact. This makes it naturally Class A rated without any additional treatment. Beyond fire protection, metal roofing reflects radiant heat, reducing the amount of heat transferred into the attic during a fire event and helping to slow structural degradation.
Our metal roofing service installs standing seam panels and metal shingles that replicate the look of tile, wood shake, or slate while delivering superior fire protection. Metal roofing costs $7–$12 per square foot for materials, but the 40–70 year lifespan typically makes it the most cost-effective choice over time in fire-prone areas.
Tile Roofing (Clay and Concrete)
Clay and concrete tile are among the oldest roofing materials in the world, and their natural composition provides inherent fire resistance. Both materials are non-combustible and will not ignite from embers — they achieve Class A ratings through material properties alone. Tile roofing is particularly well-suited to Sonoma County's Mediterranean climate: the thermal mass of the tiles moderates attic temperatures, and the material is virtually impervious to UV degradation.
The primary consideration with tile is structural: tile roofs weigh 850–1,100 pounds per square (100 sq ft), compared to 230–350 pounds for asphalt. Many older homes in Sonoma County require structural reinforcement before tile can be installed. However, for new construction or homes with adequate structural capacity, tile represents an exceptional long-term fire protection investment.
| Class A Asphalt Shingles | $3–$5/sq ft materials |
| Metal Roofing | $7–$12/sq ft materials |
| Installation Labor | $2–$4/sq ft |
California Building Code Requirements
California's fire-resistant roofing requirements have strengthened significantly since the 2017–2018 fire seasons. For homes in designated fire zones:
- Class A roofing assembly is required (not just Class A shingles — the entire assembly must be rated)
- Fire-resistant underlayment is typically required beneath all exterior cladding
- Roof vents must include ember-resistant mesh screens
- Eaves and soffits must be enclosed or constructed of ignition-resistant materials
Our team stays current with all applicable California building codes and can advise you on the specific requirements for your property based on its fire hazard severity zone designation. We pull all required permits and ensure every installation is code-compliant.
Financing Available
Fire-resistant roofing upgrades can be a significant investment. Sutter Roofing Systems offers financing options up to $45,000 for qualifying homeowners, making it easier to upgrade your roof without delay. Contact us at (707) 829-5050 or request a free estimate to learn more about our financing programs.
