Class A Fire-Rated Roofing

What Does Class A Fire Rating Mean?

Class A is the highest fire classification assigned to roofing materials under UL 790 (ASTM E108) testing. It means the roofing assembly resists severe fire exposure including spread of flame, burning brand penetration, and intermittent flame application. Metal roofing inherently achieves Class A because the material itself is non-combustible.

Is Class A Fire Rating Required in California?

California Building Code requires Class A fire-rated roofing in all Wildland-Urban Interface (WUI) zones, Very High Fire Hazard Severity Zones (VHFHSZ), and State Responsibility Areas. Many local jurisdictions extend this requirement further. Even outside mandatory zones, insurance carriers increasingly require Class A roofing for policy issuance or renewal.

How Does Metal Roofing Compare to Other Class A Materials?

Some concrete tiles, treated wood shakes, and specialty asphalt shingles also achieve Class A rating. However, metal roofing provides superior ember resistance because its interlocking seam design eliminates the gaps where embers accumulate and ignite underlayment. Tile roofs, despite their Class A rating, often allow ember intrusion through gaps between tiles.

What Documentation Does The Metal Roof Pros Provide for Fire Rating Compliance?

Every fire-rated installation includes manufacturer fire test reports (UL 790 / ASTM E108), product listing documentation, installation compliance photography, and a project completion certificate. This package satisfies building department inspection requirements, insurance carrier documentation needs, and defensible space program verification.