Roofing Shingle Classes

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

Roofing shingle classes.

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. I ll share on several test that can be performed in this category for the highest performing impact resistant shingles on the market today. Withstand a burning brand measuring 1 5 x 1 5 and weighing 1 4 gram. 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. 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. 2218 steel ball listing.

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. Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating. Cool roof shingles california title 24. Class a is the highest level.

The class 4 shingle. Ul 790 and astm e 108. This scrim reinforcement helps the shingle withstand the impact of hail. What are roof shingles.

Experience maximum flame spread of 13 feet. Fire resistance is based on two test standards. Class c roofing provides only light fire protection.