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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 213 of the 243 permitting authorities we cover outside Colorado (Texas 33 of 33, Minnesota 14 of 24, Iowa 15 of 23, Oklahoma 21 of 23, Tennessee 18 of 23, Missouri 22 of 22, Ohio 19 of 21, Kansas 17 of 17, South Dakota 12 of 14, Arkansas 12 of 12, New Mexico 11 of 12, Nebraska 8 of 8, Georgia 3 of 3, Indiana 3 of 3, Wisconsin 3 of 3, North Dakota 1 of 1, Wyoming 1 of 1), 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. 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/.