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…