Fire Rating For Roof Materials

We must emphasize however that individual roof components are not rated at all.

Fire rating for roof materials.

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. Stucco is often recommended as one of the best materials for boxing in hazardous eaves. Class c roofing provides only light fire protection. Roofing fire ratings 101 roofing materials go through strenuous testing to determine a fire rating.

Some roofing materials such as untreated wood are unrated as they cannot meet even the minimum ratings for fire safety. Our roof systems are rated by code for external fire resistance under deck exposure and time temperature resistance. The highest rating meaning the most fire resistant is classified as class a and is able to withstand severe fire exposure. Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating.

Both are burn through tests and the ultimate roof systems rating is the lowest of the three tests. This includes checking if the material is combustible whether it will splinter and generate flying firebrands i e. This rating indicates that the roofing materials limited to withstanding only light exposure to fire if the fire source is outside the building. Class a roofing materials.

The brands consist of an ignited wood lattice placed directly on top of the test specimen. It is recommended in areas throughout the united states where forest fires are common. The different roofing materials that are available for installation on your home are all evaluated for their fire resistant capabilities. The rating scale is relatively simple and is rated from a to c.

But by including a particular underlying material it can meet the requirements for a class a roof. Roofing systems are rated by realistic fire tests. 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.

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. Withstand a burning brand measuring 1 5 x 1 5 and weighing 1 4 gram. Stop fire and stay stylish.

Here are the three rating categories you need to know. An exterior fire retardant treated shake roof has a stand alone class b rating. Roofing with a class c rating is able to. Federal housing administration fha and other lenders require that building roofing materials conform to these standards.

The class a brand weighs 2 000 grams class b 500 grams and class c 9 1 4 grams.