Class 4 shingles are objectively superior to Class 3 shingles in impact resistance, structural durability, and severe weather defense. Under UL 2218 testing protocols, Class 4 shingles withstand severe simulated steel-ball impacts without cracking or fracturing on the reverse side, whereas Class 3 shingles tolerate moderate impacts. Furthermore, installing Class 4 materials frequently qualifies homeowners for substantial annual property insurance premium discounts that offset upgrade costs.
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