What is the difference between Class 3 and Class 4 shingles?

When choosing shingles for a new roof or replacement, you may encounter terms like Class 3 and Class 4. These classifications refer to impact resistance ratings established by Underwriters Laboratories (UL), and understanding the difference can help you make an informed decision, especially if you live in an area prone to hail or severe weather.

Impact Resistance Ratings Explained

The UL 2218 standard tests shingles by dropping steel balls of varying sizes onto them from a specific height. Shingles are rated Class 1 through Class 4 based on the size of the ball they can withstand without damage. Class 3 shingles can resist impact from a 1.75-inch steel ball, while Class 4 shingles can withstand impact from a 2-inch steel ball. This difference may seem small, but it represents a significant increase in durability and protection.

Why Class 4 Matters

Class 4 shingles are engineered to provide the highest level of impact resistance available for residential roofing. They are particularly beneficial in regions where hailstorms are common, as they are less likely to suffer damage that leads to leaks or requires replacement. Many insurance companies recognize this added protection and offer discounts on homeowners insurance premiums for homes with Class 4 shingles. Over time, these discounts can offset the higher upfront cost of Class 4 materials.

Choosing the Right Class

If you live in a hail-prone area or want maximum durability, Class 4 shingles are worth considering. If your region experiences milder weather and you are working within a tighter budget, Class 3 shingles still offer good protection. Talk to roofing professionals and your insurance provider to determine which class makes the most sense for your home and location.

Understanding shingle classifications helps you choose materials that balance cost, performance, and long-term value.