Fire Rating For Roof Materials

Roofing systems are rated by realistic fire tests.

Fire rating for roof materials.

Stucco is often recommended as one of the best materials for boxing in hazardous eaves. Experience maximum flame spread of 13 feet. Our roof systems are rated by code for external fire resistance under deck exposure and time temperature resistance. 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.

The class a brand weighs 2 000 grams class b 500 grams and class c 9 1 4 grams. An exterior fire retardant treated shake roof has a stand alone class b rating. 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.

Withstand a burning brand measuring 1 5 x 1 5 and weighing 1 4 gram. A one inch 2 54 centimeter layer of stucco can easily lend a 1 hour fire rating to a wall source. The rating scale is relatively simple and is rated from a to c. Burning pieces of debris and if flames can spread across its surface.

Stop fire and stay stylish. This rating indicates that the roofing materials limited to withstanding only light exposure to fire if the fire source is outside the building. 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. We must emphasize however that individual roof components are not rated at all.

The brands consist of an ignited wood lattice placed directly on top of the test specimen. If the roof deck is combustible such as wood plywood or osb two additional tests must be conducted. Here are the three rating categories you need to know. Some roofing materials such as untreated wood are unrated as they cannot meet even the minimum ratings for fire safety.

Roofing with a class c rating is able to. Roofing fire ratings 101 roofing materials go through strenuous testing to determine a fire 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.

But by including a particular underlying material it can meet the requirements for a class a roof. Class c roofing provides only light fire protection. Class a roofing materials. 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.

Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating.