TL;DR
An impact-resistant shingle is an asphalt shingle reinforced with polymer-modified asphalt or a mesh backing and tested under UL 2218, where Class 4, the top grade, survives a 2-inch steel ball dropped twice in the same spot without cracking. In hail states many insurers discount premiums 5 to 30 percent for documented Class 4 roofs, which can repay the upgrade cost over the roof's life.
What it means
An impact-resistant shingle is an asphalt shingle reinforced with polymer-modified asphalt or a mesh backing and tested under UL 2218, where Class 4, the top grade, survives a 2-inch steel ball dropped twice in the same spot without cracking. In hail states many insurers discount premiums 5 to 30 percent for documented Class 4 roofs, which can repay the upgrade cost over the roof's life. The rating addresses cracking, not cosmetic granule loss, and some policies attach cosmetic-damage exclusions when the discount is taken.
Where it sits in the glossary
Impact-resistant shingle is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
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