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