Underwriters laboratories inc ul an independent for profit company has developed a series of laboratory test to measure how well roofing materials resist hail.
Hail ratings roof.
These tests are widely accepted by the roofing industry and the results are widely quoted in industry promotional materials.
For the majority of homes a class 4 ul 2218 rating will be sufficient in protecting your home from roof penetration due to a hail storm.
Summarizing the result we would be looking at for a class 3 roof is earned if the sample does not crack when hit twice in the same spot by a 1 75 inch diameter steel ball.
The ratings are given by taking a steel ball and dropping it from a pre determined height and measuring the damage the roof has sustained.
Below cr members with digital access can read ratings and reviews of three top performing shingles from our tests.
The last factor in determining a good choice for a hail resistant roof is choosing the type of metal panel itself.
Check our latest roofing ratings for detailed results for 16 different lines of.
In most cases a corrugated panel is the best option for pure protection.
The corrugation helps deflect and hide any deformities that may occur from a hail storm.
A class 4 test involves a steel ball weighing 1 2 pounds being dropped from a height of 12 to 20 feet on the same location of the assembly.
The american society of testing and materials astm perform the tests.
What are hail ratings impact resistance ratings.