What is a Class 4 impact rating?
A Class 4 impact rating is the highest hail-resistance classification under UL 2218, awarded to asphalt shingles that withstand 2-inch diameter ball bearings dropped from 20 feet without tearing, cracking, or creating holes.
The Class 4 impact rating comes from UL 2218, a testing standard that evaluates how well asphalt and composite shingles resist hail damage. Class 4 is the top tier, reserved for shingles that survive the most demanding lab test: a 2-inch steel ball bearing dropped from 20 feet onto the shingle surface multiple times without sustaining tears, cracks, or penetrations. Lower ratings (Class 1, 2, and 3) use smaller projectiles or lower drop heights.
In Connecticut, insurers recognize Class 4 as a significant durability marker. Many homeowners with Class 4 rated roofs qualify for insurance premium discounts, since the rating indicates reduced likelihood of weather-related claims. The discount amount varies by carrier and policy, but the recognition across the insurance industry makes this rating a concrete asset for property owners in hail-prone seasons.
Contractors often highlight Class 4 certification when replacing roofs, particularly for homes with previous hail damage history or those seeking long-term protection. The rating appears on manufacturer documentation and shingle packaging. If you need guidance on selecting Class 4 materials or understand your roof's current rating, roof inspection providers in Connecticut can assess your existing shingles and advise on whether upgrading to Class 4 makes sense for your property.