UL-2218 Impact Test

UL 2218 is a test standard developed by Underwriters Laboratories (UL), which is used to evaluate the impact resistance of roofing materials, specifically asphalt shingles.

The test involves dropping a steel ball from a height of up to 20 feet onto the roofing material, simulating the impact of hailstones. Hailstorms can cause significant damage to roofs, including cracking, puncturing, or fracturing of roofing materials. This can lead to leaks, water damage, and even structural damage to the home.

The material is then rated based on a classification system that ranges from Class 1 to Class 4, with Class 4 being the most resistant to impact.

As shown in the video above, the steel ball’s impact on the roofing material on the left (which is a standard roofing shingle) causes granules to severely loosen. Notice the cloud of granules that appear after the steel ball impacts the shingle. Those granules are no longer adhered to the shingle and will immediately be blown off by wind or washed off by rain. Whereas the ball’s impact on the roofing material on the right (which has been fortified with Cericade) results in absolutely no granule loss.

Having shingles on a home that exceeds a Class 4 Rating for impact resistance can provide several benefits to the homeowner, including:

  • Highest possible protection level – A Class 4 rating is the highest level for impact resistance and proves that the shingle can withstand severe hailstorms with large hailstones. This will help protect the roof from severe damage and reduce the risk of leaks and other water-related issues.
  • Potential insurance savings – If hail does not cause damage to the roof, filing a claim with the insurance carrier is not necessary, thereby minimizing the potential of insurance premiums being increased.
  • Increased resale value – Having shingles that exceed Class 4 Rating installed on a home can increase its resale value, as it provides an added layer of protection and peace of mind to potential buyers.

Overall, the UL 2218 test provides an important measure of the impact resistance of roofing materials and helps to ensure that the roofing materials are durable and can withstand hailstorms and other severe weather conditions, which can help to prevent damage to the home and potentially save homeowners money in repairs and insurance premiums.