K&M Roofing & Exteriors

What Is a Class 4 Impact Resistant Shingle? A Class 4 impact resistant shingle is the highest level of hail impact resistance available for asphalt roofing shingles. These shingles are designed to better withstand hail strikes and severe storm conditions. Impact ratings come from the UL 2218 impact resistance test, where steel balls are dropped onto shingles to simulate hail impacts. For a shingle to receive a Class 4 rating, it must withstand the impact of a 2-inch steel ball without cracking or allowing damage to the underlying material. Class 4 shingles are typically manufactured using reinforced materials such as polymer-modified asphalt or rubberized asphalt blends. These materials help the shingle absorb impact rather than fracture when struck by hail. Benefits of Class 4 impact resistant shingles include: • Greater resistance to hail damage • Increased durability during severe storms • Longer potential roof lifespan • Possible insurance premium discounts depending on the insurer However, it’s important to understand that impact resistant does not mean hail-proof. Extremely large hail or severe storms can still cause damage to any roofing system. In areas like Memphis, Germantown, and the surrounding Mid-South where hailstorms occasionally occur, many homeowners choose Class 4 shingles for the added durability and potential insurance savings. If you're considering upgrading your roofing system, a professional roofing contractor can help determine what you need.