Fire retardant shakes and shingles are coded by a three letter rating system. This system is based on laboratory tests of exposing the shakes and shingles to fire. The amount of breaking, cracking, or ability to protect the decking and underlayment of the roof determine the rating levels. A shingle material that withstands severe fire exposure is known as a class 'a' rating. Moderate fire resistance is coded as a class 'b' rating. The ability to hold-up to a light fire qualifies as a class 'c' rating. Special retardant treatments are required for wooden shingles. The shingles can be treated either before or after installation. Due to the flammability of untreated wooden shingles, some states are restricting their use. The rating should be displayed on the shingle packaging. And remember, fire retardant doesn't mean fire resistant. These ratings are based only on the ability to slow the fire and possible damage to your property. Contact a roofing specialist for more information on fire retardant shakes and shingles.
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