Withstand a burning brand measuring 1 5 x 1 5 and weighing 1 4 gram.
Fire rating roofing shingles.
Consumer reports reveals the best roofing shingles from its comprehensive tests including 3 tab architectural and multilayered architectural asphalt shingles.
Wood shake plywood or particle board roof are the most common roofing types listed as class c.
Experience maximum flame spread of 13 feet.
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.
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.
Class a roofing materials are the most fire resistant.
Classes b and c denote progressively less fire resistant qualities.
An exterior fire retardant treated shake roof has a stand alone class b rating.
But by including a particular underlying material it can meet the requirements for a class a roof.
Roofing with a class c rating is able to.
Shingles are categorized into classes that identify their fire resistance.
Ul 790 is a quality assurance service listing.
Class c roofing provides only light fire protection.