Roofing Shingle Classes

Class c roofing provides only light fire protection.

Roofing shingle classes.

Due to the materials used in their construction most asphalt shingle roof assemblies have a class a fire resistance rating. Experience maximum flame spread of 13 feet. 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. 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.

Ul 790 and astm e 108. The class 4 shingle. Roofing with a class c rating is able to. What are roof shingles.

Fire resistance is based on two test standards. Withstand a burning brand measuring 1 5 x 1 5 and weighing 1 4 gram. With class 4 shingles there are no splits or tears. 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.

This scrim reinforcement helps the shingle withstand the impact of hail. Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating. 2218 steel ball listing. Cool roof shingles california title 24.

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. There are three levels of fire resistance. Roof shingles are installed in such a fashion that each seam or joint is overlapped by a shingle further up the roof.