UL 2218 Class 4
UL 2218 Class 4 is the highest impact (hail) rating under the UL 2218 standard — the roofing must withstand a 2-inch steel ball dropped from 20 feet with no tearing, cracking, splitting or rupture.
UL 2218 Class 4 is the highest rating for impact resistance under the UL 2218 standard developed by Underwriters Laboratories (UL). For roofing, it indicates the ability to withstand significant impact — specifically from hail.
To earn a Class 4 rating, the roofing must pass a test in which a 2-inch-diameter steel ball is dropped from a height of 20 feet onto the material, which must show no evidence of tearing, fracturing, cracking, splitting, or rupture.
Class 4 impact-rated roofing provides superior protection against wind, rain, heavy snow and hail, and can qualify homeowners for reduced insurance premiums in some regions (this varies by location and insurer).
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Standard: UL Solutions — UL 2218 Impact Resistance of Prepared Roof Covering Materials. Related: ICC-ES ESR-1790 · Florida FL7263-R7.