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Tech Brief Class A Fire Rating Background All roofing products are tested and classified for their ability to resist fire. Recently, these fire resistance standards were expanded to include solar equipment as part of the roof system. Specifically, this requires the modules, mounting hardware and roof covering to be tested together as a system to ensure they achieve the same fire rating as the original roof covering. These new requirements are being adopted throughout the country in 2016. IronRidge Certification IronRidge was the first company to receive a Class A Fire Rating—the highest possible rating—from Intertek Group plc., a Nationally Recognized Testing Laboratory. IronRidge Flush Mount and Tilt Mount Systems were tested on sloped and flat roofs in accordance with the new UL 1703 & UL 2703 test standards. The testing evaluated the system’s ability to resist flame spread, burning material and structural damage to the roof. Refer to the table below to determine the requirements for achieving a Class A Fire Rating on your next project. Test Setup Solar Modules Solar modules are given a Type classification based on their materials and construction. Mounting System Mounting is tested as part of a system that includes type-tested modules and fire-rated roof covering. Roof Covering Roof covering products are given a Fire Class Rating of A, B or C based on their tested fire resistance. A burning wooden block is placed on module as a fan blows at 12 mph. Flame cannot be seen on underside of roof within 90 minutes. Burning Brand Test Flame at southern edge of roof is aimed up the roof as a fan blows at 12 mph. The flame cannot spread 6 feet or more in 10 minutes. Spread of Flame Test Fire Testing Process System Roof Slope Module Fire Rating* Flush Mount Any Slope Type 1, 2, & 3 Class A Tilt Mount ≤ 6 Degrees Type 1, 2, & 3 Class A *Class A rated PV systems can be installed on Class A, B, and C roofs. 2314 W San Lorenzo Ave11/17/2023