Materials
What is Impact-Resistant Shingles?
Roofing Glossary · Materials
Definition
Asphalt or composite shingles tested and rated under UL 2218 for resistance to impact from simulated hail. Class 4 is the highest rating, indicating the shingle withstands impact from a 2-inch steel ball dropped from 20 feet without cracking. Class 4 shingles qualify for insurance premium discounts of 10-30% in many states and are required or incentivized in high hail-frequency corridors across the central U.S.
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