Fire Rated Roofing Materials

Class b materials are banned in some areas however because they are combustible.

Fire rated roofing materials. Class a roofing materials are the most fire resistant. Non treated materials have a class c fire rating but wood can cedar shingles and shakes are also available as a more costly treated option wood roofing is prohibited in some areas prone to wildfire so be sure to check with your building department first. Roofing with a class c rating is able to. When tested to see how fast a fire spreads with these materials class a materials stop the spread two feet better than class b.

Metal roofing is non combustible and offers class a protection in combination with a fire resistant underlayment. Roof eaves overhangs are a fire hazard but they can be protected with an encasement of fire resistant material. Classes b and c denote progressively less fire resistant qualities. Fiberglass based asphalt shingles as the most economical of all residential roofing materials asphalt shingles make up 80 percent of the u s.

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. Stucco is often recommended as one of the best materials for boxing in hazardous eaves. It s lightweight won t corrode and requires little maintenance. Experience maximum flame spread of 13 feet.

The fiberglass based variety also offers excellent fire resistance when installed with fire code compliant underlayments. The benefit of metal tiles is that they are non corrosive and sit strong on houses with a steep slope. A one inch 2 54 centimeter layer of stucco can easily lend a 1 hour fire rating to a wall source. Class c fire resistant roofing material obviously since wildfires and the fire season has become increasingly worse it is important to note the roofing materials that are the lowest rated.

Most metal roofs are made of steel copper zinc and alloys that are best for the dry environment in nevada. An exterior fire retardant treated shake roof has a stand alone class b rating. Withstand a burning brand measuring 1 5 x 1 5 and weighing 1 4 gram. Metal tiles are made of a material that does not ignite when on fire with a fire resistant barrier with a class a protection.

Class b materials are fire resistant but only withstand moderate exposure to fire. Class c roofing provides only light fire protection. Stop fire and stay stylish. Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating.

Shingles are categorized into classes that identify their fire resistance. But by including a particular underlying material it can meet the requirements for a class a roof. These materials include clay concrete shingles metal roofing and fiberglass asphalt composition.