Standard GAF Timberline HDZ architectural shingles carry a UL 2218 Class 3 impact-resistance rating. This classification means the shingles have successfully passed rigorous testing where a 1.75-inch steel ball is dropped from a specified height without cracking the shingle's asphalt mat, providing robust, reliable defense against severe weather, wind-driven debris, and moderate hail strikes commonly encountered in residential roofing environments.
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