The class a brand weighs 2 000 grams class b 500 grams and class c 9 1 4 grams.
Fire rating for roof materials.
The rating scale is relatively simple and is rated from a to c.
An exterior fire retardant treated shake roof has a stand alone 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 called densdeck.
But by including a particular underlying material it can meet the requirements for a class a roof.
Stop fire and stay stylish.
Here are the three rating categories you need to know.
Withstand a burning brand measuring 1 5 x 1 5 and weighing 1 4 gram.
Burning pieces of debris and if flames can spread across its surface.
If the roof deck is combustible such as wood plywood or osb two additional tests must be conducted.
Experience maximum flame spread of 13 feet.
National or model building codes state canadian provincial building codes or fire codes require that roofs must carry at least a class c fire rating or better.
Stucco is often recommended as one of the best materials for boxing in hazardous eaves.
The different roofing materials that are available for installation on your home are all evaluated for their fire resistant capabilities.
Roof eaves overhangs are a fire hazard but they can be protected with an encasement of fire resistant material.
Class a roofing materials.
It is recommended in areas throughout the united states where forest fires are common.
The highest rating meaning the most fire resistant is classified as class a and is able to withstand severe fire exposure.
This rating indicates that the roofing materials limited to withstanding only light exposure to fire if the fire source is outside the building.
Some roofing materials such as untreated wood are unrated as they cannot meet even the minimum ratings for fire safety.
Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating.
Federal housing administration fha and other lenders require that building roofing materials conform to these standards.
Both are burn through tests and the ultimate roof systems rating is the lowest of the three tests.
The benefit of purchasing a class a roof is it can withstand severe exposure to fire and has the highest rating compared to class b and class c.
Class c roofing provides only light fire protection.
Roofing fire ratings 101 roofing materials go through strenuous testing to determine a fire rating.
The brands consist of an ignited wood lattice placed directly on top of the test specimen.
Roofing with a class c rating is able to.
A one inch 2 54 centimeter layer of stucco can easily lend a 1 hour fire rating to a wall source.
We must emphasize however that individual roof components are not rated at all.
