Yes, GAF Timberline UHDZ shingles carry an official UL 2218 Class 4 impact resistance rating, representing the highest possible performance standard for residential asphalt roofing. This rating is achieved because the shingles utilize advanced UltraMat high-performance fiberglass core technology that successfully passes rigorous laboratory drop-tests, where a 2-inch steel ball is dropped from a height of 20 feet repeatedly without causing any fracturing, splitting, or tearing on the back of the material.
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