Fire Rating Roofing Shingles

Shingles are categorized into classes that identify their fire resistance.

Fire rating roofing shingles.

Class c fire resistant roofing material. Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating. Common underlying materials include a type 72 roll roofing material also known as 72 pound felt or 72 pound capsheet material and a panelized gypsum product. Experience maximum flame spread of 13 feet.

Class a roofing materials are the most fire resistant. Generally most fiberglass shingles have class a fire ratings and most organic shingles such as treated wood shingles have class c ratings. Obviously since wildfires and the fire season has become increasingly worse it is important to note the roofing materials that are the lowest rated. Roofing with a class c rating is able to.

Roof covering packaging that encloses shingles or other roofing that have a fire rating will display the level of fire or wind resistance rating of the materials. But by including a particular underlying material it can meet the requirements for a class a roof. An exterior fire retardant treated shake roof has a stand alone class b rating. Classes b and c denote progressively less fire resistant qualities.

Class c roofing provides only light fire protection. Wood shake plywood or particle board roof are the most common roofing types listed as class c.