Yes, GAF Timberline UHDZ shingles carry an official UL 2218 Class 4 impact resistance rating, which is the highest possible rating an asphalt roofing shingle can achieve. This rating is earned because the shingles utilize advanced UltraMat high-performance fiberglass core technology capable of withstanding severe laboratory testing, where a 2-inch steel ball is dropped repeatedly from a height of 20 feet without causing any fracturing, cracking, or splitting on the back of the material.
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