Metal Roof Fire Rating

Metal is a safe and environmentally responsible choice for a fire resistant roof classic metal roofing systems the leader in producing fire safe roofing for residential applications manufactures products that are 1 20 the weight of most tile products and eligible for class a b or c fire ratings as determined by roof preparation.

Metal roof fire rating.

D horizontal membrane 52 shaft wall used in a horizontal plane. Internal fire exposure under deck fire exposure may also originate with an arsonist process fire or the like. It is available in many colors and is an excellent choice for protection against wildfire damage. The different roofing materials that are available for installation on your home are all evaluated for their fire resistant capabilities.

A standard fire test is used to determine the fire rating of a roof covering. The rating scale is relatively simple and is rated from a to c. Each requires a spread of flame test and a burning brand test. Your roof can have one of four fire ratings classifications.

Wood framed including dimensional lumber engineered joist and truss. The highest rating meaning the most fire resistant is classified as class a and is able to withstand severe fire exposure. Metal roof systems are required to be fire classified because of the concern about the combustibility of the materials under the metal panels. The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c.

With other products the product itself is not class a fire rated but rather the entire roof system is class a fire rated. No other roofing product has a stand alone class a fire rating. How are roofing materials rated. A class a roof is ideal for fire protection and may be required by your building codes depending on your place of residence.

The 2012 and 2015 ibc in section 1505 of chapter 15 states that fire classification of roof assemblies is based on two tests astm e108 and ul 790 that are fundamentally identical. The slope of the test specimen is preselected and since steeper slopes are more of a challenge due to melting material feeding the fire the rating applies to the maximum slope passed. Metal roofing is the lightest fire resistant roofing product on the market and it easily achieves a class a fire rating. This test evaluates the following performance criteria.

1 flame penetration through the roof covering into the attic space 2 flame spread over the surface of the roof covering and 3 the propensity for the roof covering to become dislodged and generate embers. While a steel roof deck is considered non combustible it readily conducts heat. C roof ceilings45 51 steel framed including steel bar joist framing steel c joist framing steel truss and steel roof deck. Tested roof systems are fire classified class a b or c where the.