Roofing Shingle Classes

Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating.

Roofing shingle classes.

Currently the highest class of asphalt shingles is the class 4 shingle which will carry at least the u l. Roofing with a class c rating is able to. 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.

Due to the materials used in their construction most asphalt shingle roof assemblies have a class a fire resistance rating. The class 4 shingle. Fire resistance is based on two test standards. 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.

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. Ul 790 and astm e 108. This scrim reinforcement helps the shingle withstand the impact of hail. Experience maximum flame spread of 13 feet.

Class a is the highest level. There are three levels of fire resistance. 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. 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. Roof shingles are installed in such a fashion that each seam or joint is overlapped by a shingle further up the roof. With class 4 shingles there are no splits or tears.