These shingles are also not readily flammable will not readily contribute to the spread of fire and are relatively effective against moderate fire exposure.
Fire rating roofing shingles.
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Ul 790 is a quality assurance service listing.
Class a fire resistance rating.
Withstand a burning brand measuring 1 5 x 1 5 and weighing 1 4 gram.
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.
110 130 mph wind warranty.
Classes b and c denote progressively less fire resistant qualities.
Shingles are categorized into classes that identify their fire resistance.
Experience maximum flame spread of 13 feet.
The ul tests under ul 790 evaluate the behavior of a roof covering under three fire hazards exposure of the roof to intermittent flame.
A standard fire test is used to determine the fire rating of a roof covering.
Unique diamond shape is a good choice for homes with a steep roof.
Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating.
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.
Shingles feature an algae defender.
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 fire rating shingles with the highest fire resistance are classified as class a.
Features a diamond open tooth design.
Generally most fiberglass shingles have class a fire ratings and most organic shingles such as treated wood shingles have class c ratings.
Class a roofing materials are the most fire resistant.
The main difference.