Metal Roof Fire Rating

While a steel roof deck is considered non combustible it readily conducts heat.

Metal roof fire rating. Wood framed including dimensional lumber engineered joist and truss. It is available in many colors and is an excellent choice for protection against wildfire damage. The rating scale is relatively simple and is rated from a to c. This in turn might fluidize or vaporize combustible roofing components that leak into the structure spreading fire underneath the roof deck.

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. No other roofing product has a stand alone class a fire rating. 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 different roofing materials that are available for installation on your home are all evaluated for their fire resistant capabilities. 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. This test evaluates the following performance criteria. 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. Metal roofing is the lightest fire resistant roofing product on the market and it easily achieves a class a fire rating. A standard fire test is used to determine the fire rating of a roof covering. 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.

The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c. 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. C roof ceilings45 51 steel framed including steel bar joist framing steel c joist framing steel truss and steel roof deck. How are roofing materials rated.

Metal roof systems are required to be fire classified because of the concern about the combustibility of the materials under the metal panels. Your roof can have one of four fire ratings classifications. D horizontal membrane 52 shaft wall used in a horizontal plane. 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.