Class 4 impact resistance is the highest common impact rating for asphalt shingles under standardized hail-impact testing. It is typically an upgrade from the standard shingles installed on many homes.
Why It Matters
Class 4 products may offer stronger impact resistance than standard Class 3 shingles, which can matter in areas that see frequent hail. Some insurance carriers may offer premium discounts for approved Class 4 products, but the discount is not always enough to offset the added material cost.
Common Problems
Common issues include assuming Class 4 means damage-proof, not reading warranty exclusions, choosing a product based only on rating, and assuming an insurance discount will automatically make up the cost difference. Homeowners should clarify any discount, documentation requirement, and policy impact with their insurance carrier before making that decision.
Building Codes & Industry Standards
Class 4 impact resistance is commonly associated with UL 2218 testing. Product documentation should be reviewed for exact rating, warranty terms, and installation requirements.
Exterior Echelon Notes
Exterior Echelon helps homeowners compare impact-rated shingles honestly, including what the rating does and does not mean. Class 4 can be a smart upgrade for some homes, but the value should be weighed against the actual product cost, warranty terms, and any insurance benefit confirmed by the carrier.
