A Class 3 roof refers to a roofing system constructed with materials that have successfully passed the UL 2218 impact-resistance test, specifically withstanding the high-speed impact of a 1.75-inch steel ball dropped from a height of 20 feet without cracking or splitting the backing. Class 3 shingles—such as standard GAF Timberline HDZ architectural lines—provide robust, reliable defense against moderate hail strikes, wind-driven debris, and severe weather compared to standard non-rated or basic 3-tab roofing materials.
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