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Where Class 4 Impact-Resistant Shingles Are Required

Jurisdictions whose own adopted-code amendments or published roofing regulations MANDATE UL 2218 Class 4 impact-resistant asphalt shingles — a requirement, not an insurer discount. Each card below quotes the jurisdiction’s own amendment and its exceptions. We have also read the adopted residential code amendments of 3320 of the 4987 permitting authorities we cover outside Colorado (Pennsylvania 649 of 1043, Michigan 750 of 760, New Jersey 462 of 462, Florida 120 of 148, Connecticut 140 of 140, Wisconsin 134 of 139, New Hampshire 136 of 136, Maine 126 of 126, Ohio 20 of 107, Kansas 45 of 96, Indiana 76 of 84, Oklahoma 22 of 75, South Carolina 60 of 70, Virginia 67 of 69, Texas 61 of 65, North Carolina 50 of 60, Louisiana 56 of 56, Minnesota 17 of 56, Georgia 47 of 48, Nebraska 32 of 45, Idaho 28 of 43, Rhode Island 39 of 39, North Dakota 30 of 35, Missouri 23 of 25, Tennessee 18 of 24, Iowa 15 of 23, Illinois 17 of 21, Utah 16 of 16, Kentucky 15 of 15, South Dakota 12 of 14, Arkansas 12 of 12, New Mexico 11 of 12, Montana 5 of 11, Wyoming 9 of 10), and found NO residential Class 4 mandate in any of them; each of those records carries the negative together with the instrument that was read. Not yet read: California (442), Massachusetts (156), Washington (150), Oregon (73), New York (58), Maryland (23). Several Dallas–Fort Worth cities do amend their roof-covering sections, but to set FIRE classification (Class A, B or C under ASTM E 108 / UL 790), which is a different test from impact resistance. Across the hail belt outside Colorado, Class 4 is driven by insurer discounts rather than by code. Absence from this list means no mandate was found in that jurisdiction’s own sources, not that Class 4 is a bad idea in hail country — and for the jurisdictions carrying no recorded finding either way, it means we have not established one. The narrative version of this map, including the repair thresholds that decide whether a mandate bites on a given job, is in the guide: theroofingbook.com/guides/where-class-4-shingles-are-required-by-code/.