Allied StormShield three-tier Class 4 impact-resistant roofing system installed on an Illinois home, showing sealed deck construction and Atlas Signature Select shingles

Allied StormShield: Engineered Class 4 Impact-Resistant Roofing Systems Built for Illinois Storms

Allied StormShield is a three-tier roofing system engineered specifically for Illinois hail, wind, and roof-age underwriting pressures. Every tier centers on UL 2218 Class 4 impact-resistant shingles, manufacturer-specified high-wind nailing, and full code compliance with the International Residential Code chapters governing roof assemblies (IRC R905), attic ventilation (R806), and roof sheathing (R503). The tiers differ…

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Hailstones deflecting off a UL 2218 Class 4 impact-resistant asphalt shingle roof during an Illinois storm, with Allied Emergency Services certification seal

Class 4 Impact-Resistant Roofing in Illinois: A Homeowner’s Guide to UL 2218 Shingles, Wind Mitigation, and Insurance Premium Credits

A Class 4 impact-resistant (IR) shingle is a roofing product that has passed the UL 2218 standard’s 2-inch steel-ball drop test — the highest rating in the four-tier UL 2218 system. In Illinois, Class 4 IR shingles are not subject to a mandatory premium discount under state law (unlike Texas under HB 1183), but several…

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