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Class 4 Impact-Resistant Roofing Materials
Roofing material categories that reach UL 2218 Class 4, the highest impact rating — the impact-resistant options most relevant to Colorado hail country.
Class 4 Impact-Resistant Shingle
Asphalt (often SBS-modified rubberized) shingles that pass UL 2218 Class 4, the highest impact rating, resisting a 2-inch steel ball dropped from 20 feet without cracking.
Corrugated Metal Panel
Wavy or ribbed metal panels (typically galvanized or Galvalume steel, sometimes aluminum) fastened through the face with exposed screws. An economical exposed-fastener metal roof common on agricultural, industrial, and budget residential roofs.
Metal Shingle
Individual interlocking metal shingles, usually aluminum or steel, stamped to resemble slate, shake, or tile. A concealed-fastener steep-slope metal system lighter than the profiles it imitates.
Rubber (Polymer) Shingle
Steep-slope shingles and shakes molded from recycled rubber and polymers, engineered for flexibility and impact resistance. Many products pass UL 2218 Class 4, making them a common impact-resistant alternative to asphalt.
Standing-Seam Metal Roof
Interlocking vertical metal panels with concealed fasteners and raised seams, typically steel or aluminum. A premium, long-life steep-slope and low-slope system.
Stone-Coated Steel
Steel panels with an adhered stone-granule surface, formed into tile, shake, or shingle profiles. Combines the impact and wind performance of steel with the appearance of tile or wood at a fraction of the weight.
Synthetic Shake
Molded polymer shingles engineered to replicate the look of split cedar shake at lower weight and maintenance. Frequently rated UL 2218 Class 4 and Class A fire without the rot, insect, or combustibility concerns of real wood.
Synthetic Slate
Molded polymer (often with recycled content) tiles engineered to replicate natural slate or shake at a fraction of the weight, frequently rated UL 2218 Class 4.