Roofing Shingle Classes

Experience maximum flame spread of 13 feet.

Roofing shingle classes.

Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating. Roof shingles are installed in such a fashion that each seam or joint is overlapped by a shingle further up the roof. Withstand a burning brand measuring 1 5 x 1 5 and weighing 1 4 gram. Class c roofing provides only light fire protection.

Due to the materials used in their construction most asphalt shingle roof assemblies have a class a fire resistance rating. With class 4 shingles there are no splits or tears. 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. Fire resistance is based on two test standards.

This scrim reinforcement helps the shingle withstand the impact of hail. There are three levels of fire resistance. Currently the highest class of asphalt shingles is the class 4 shingle which will carry at least the u l. The class 4 shingle.

Class a is the highest level. 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. What are roof shingles.

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 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.