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Denver Roofing: Article About Fire Hazards

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Wildfire is a real danger throughout the state, and even homeowners who live in the region's more urban and suburban neighborhoods need to keep their homes safe from fire. Aside from the personal safety issues involved with fire events, wildfire disasters are also costly events. One recent wildfire caused more than $420 million in property damage and losses to state residents.

When it comes to fire resistance, not all roofs are created equally. Some roof coverings, like clay tiles and some metals like copper, are naturally fire resistant. Despite the incorporation of those materials, fire embers can penetrate cracks and spaces and ignite the roof deck below. That's why even a fire resistant roof covering needs to be installed by an experienced Denver roofing contractor who is knowledgeable in all aspects of creating fire resistant roof systems.

For roofs that aren't deemed naturally fire resistant, there are several laboratory tests that rate the roof's ability to resist fire hazards. The topmost roof layer, or the roof covering, is evaluated under the UL 790 and ASTM E108 standards and testing procedures. In these tests, roof coverings are subjected to intermittent flames and flying firebrands emitted from nearby fires. How well the roof covering resists the intermittent flame, avoids ignition and inhibits the spread of fire are factors that are considered when assigning the roof's rating.

The roofers from All Around Roofing in Denver Colorado can answer any questions you have about siding or metal roofing.

During these tests, the roof decking must stay intact without becoming exposed to the flames, and it can't crumble, fall apart or produce dropping embers. Only roofs with noncombustible decks like concrete are tested for their ability to prevent flames from spreading.

The most fire resistant roof coverings are rated Class A, resisting flames of 1400 degrees Fahrenheit for 10 minutes and inhibiting the spread of fire to six feet. Class B roofs resist the same 1400 degree temperature for 10 minutes but allow flames to spread up to 8 feet. Class C are the lowest of the fire resistance ratings, resisting fire exposure up to 1300 degrees for four minutes and allowing flames to spread up to 13 feet.

Homeowners and commercial building managers may also see some roofing products that list a Class 1 rating. These usually apply to the roof's deck assembly for its ability to resist fire from interior sources and exterior sources as well as other hazards like impact resistance and wind uplift resistance. Class 1 ratings are more stringent than the Class A through C standards.

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