Metal Roof Fire Rating

In other words in order for your roof to be class a fire rated a special fire resistant underlayment needs to be installed underneath the roofing material.

Metal roof fire rating.

This in turn might fluidize or vaporize combustible roofing components that leak into the structure spreading fire underneath the roof deck. No other roofing product has a stand alone class a fire rating. With other products the product itself is not class a fire rated but rather the entire roof system is class a fire rated. Metal roofing is the lightest fire resistant roofing product on the market and it easily achieves a class a fire rating.

Internal fire exposure under deck fire exposure may also originate with an arsonist process fire or the like. The different roofing materials that are available for installation on your home are all evaluated for their fire resistant capabilities. Each requires a spread of flame test and a burning brand test. Tested roof systems are fire classified class a b or c where the.

C roof ceilings45 51 steel framed including steel bar joist framing steel c joist framing steel truss and steel roof deck. Your roof can have one of four fire ratings classifications. Metal roof systems are required to be fire classified because of the concern about the combustibility of the materials under the metal panels. 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.

Class a class b class c or unrated. The highest rating meaning the most fire resistant is classified as class a and is able to withstand severe fire exposure. The rating scale is relatively simple and is rated from a to c. The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c.

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. D horizontal membrane 52 shaft wall used in a horizontal plane. While a steel roof deck is considered non combustible it readily conducts heat. A standard fire test is used to determine the fire rating of a roof covering.

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. This test evaluates the following performance criteria. A class a roof is ideal for fire protection and may be required by your building codes depending on your place of residence. How are roofing materials rated.