The 3 types of shingles you can purchase are 3 tab, dimensional, and luxury. Impact resistant shingles are designed with a thicker gauge base mat, and composed of more flexible materials than standard shingles. Their durability rating is established by administering the UL 2218 impact test. Shingles are granted a rating of Class 1, 2, 3, or 4 based on the degree of impact they can withstand without cracking.
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