Roofing Shingle Classes

Roof shingles consist of a series of individual overlapping components that when laid together in rows or courses starting at the bottom edge of a roof form a barrier designed to repel water snow and ice.

Roofing shingle classes. Class c roofing provides only light fire protection. I ll share on several test that can be performed in this category for the highest performing impact resistant shingles on the market today. Experience maximum flame spread of 13 feet. In a class 4 ul 2218 impact resistance test a 2 inch steel ball is dropped from 20 feet to see if the shingles will fracture.

Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating. Fire resistance is based on two test standards. Cool roof shingles california title 24. What are roof shingles.

With a regular shingle most of our competitors impact resistant shingles are only class 3 cracks and ruptures will appear from that kind of impact. 2218 steel ball listing. Roofing with a class c rating is able to. With class 4 shingles there are no splits or tears.

This scrim reinforcement helps the shingle withstand the impact of hail. The class 4 shingle. Ul 790 and astm e 108. Patented weatherguard technology helps duration storm shingles achieve a ul 2218 class 4 rating the highest rating for impact resistance by integrating a polymeric backing material on the shingle.

Class a is the highest level. Due to the materials used in their construction most asphalt shingle roof assemblies have a class a fire resistance rating. Currently the highest class of asphalt shingles is the class 4 shingle which will carry at least the u l.