How Safe Is My Roof?

House on fire

Roofing with a Class A fire rating has been tested by independent testing agencies such as UL, Factory Mutual, etc. for extreme fire exposure, indicating that it will not be easily ignited, will not readily support the spread of fire over the roof area, and will not add to the fire hazard by emitting burning brands that can cause new fires. Roofing with a Class C label has been tested and rated to protect against a light fire exposure.

Many communities now require new roof coverings to meet or exceed the Class C standard, as recommended by the National Fire Protection Association of Fire Chiefs. Asphalt shingles are manufactured to meet the Class C rating or better. On the other hand, wood shakes and shingles do not meet the UL standard unless they have been chemically treated for fire retardancy. Independent testing agencies may also test shingle performance against high winds. Certain climates with high humidity may require fungus-resistant shingles.