Roofing Shingle Classes

Roof shingles are installed in such a fashion that each seam or joint is overlapped by a shingle further up the roof.

Roofing shingle classes.

Ul 790 and astm e 108. Cool roof shingles california title 24. There are three levels of fire resistance. Withstand a burning brand measuring 1 5 x 1 5 and weighing 1 4 gram.

The class 4 shingle. What are roof shingles. Currently the highest class of asphalt shingles is the class 4 shingle which will carry at least the u l. 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.

Class c roofing provides only light fire protection. 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. 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. Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating.

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. Experience maximum flame spread of 13 feet. I ll share on several test that can be performed in this category for the highest performing impact resistant shingles on the market today. Due to the materials used in their construction most asphalt shingle roof assemblies have a class a fire resistance rating.

Roofing with a class c rating is able to. Class a is the highest level. This scrim reinforcement helps the shingle withstand the impact of hail.