Material ratings critical when looking for fire-resistant roofs

Roof material fire ratings should be a key concern when assessing the fire resistance of roofs. Untreated wooden shingles are the most combustible and are classified as unrated unless treated with fire-retardant chemicals.

April 05, 2013

Roof material fire ratings should be a key concern when assessing the fire resistance of roofs. Ratings are based on how well the materials "resist the spread of fire into the attic; resist flame spread on the roof covering; and resist the generation of burning embers." Roofing materials are rated as Class A, Class B, Class C, and unrated by ASTM and the National Fire Protection Association. Untreated wooden shingles are the most combustible and are classified as unrated unless treated with fire-retardant chemicals.

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