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.

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. 2218 steel ball listing. Due to the materials used in their construction most asphalt shingle roof assemblies have a class a fire resistance rating.

Class a is the highest level. Ul 790 and astm e 108. Roof shingles are installed in such a fashion that each seam or joint is overlapped by a shingle further up the roof. The class 4 shingle.

Class c roofing provides only light fire protection. Withstand a burning brand measuring 1 5 x 1 5 and weighing 1 4 gram. 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.

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. There are three levels of fire resistance. Fire resistance is based on two test standards. 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.

Roofing with a class c rating is able to. This scrim reinforcement helps the shingle withstand the impact of hail. Cool roof shingles california title 24.