Classes b and c denote progressively less fire resistant qualities.
Fire rating roofing shingles.
Shingles feature an algae defender.
If wood shakes and shingles are impregnated with fire retardant chemicals they meet the requirements for a class b fire rating and can meet a class a rating if additional materials are included in the roof assemblies.
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.
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The ul tests under ul 790 evaluate the behavior of a roof covering under three fire hazards exposure of the roof to intermittent flame.
Features a diamond open tooth design.
Class b fire rating shingles that offer moderate fire resistance are classified as class b.
Only available in four colors.
These shingles will be effective against moderate fire exposures are not readily flammable and will not cause fires to spread.
110 130 mph wind warranty.
Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating.
Generally most fiberglass shingles have class a fire ratings and most organic shingles such as treated wood shingles have class c ratings.
Class c roofing provides only light fire protection.
Roofing with a class c rating is able to.
Class a fire resistance rating.
Shingles are categorized into classes that identify their fire resistance.
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Class a roofing materials are the most fire resistant.
Class a fire rating shingles with the highest fire resistance are classified as class a.
The main difference.
Ul 790 is a quality assurance service listing.
These shingles are also not readily flammable will not readily contribute to the spread of fire and are relatively effective against moderate fire exposure.
Experience maximum flame spread of 13 feet.