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Ul-class-a-b-or-c-roof-coverings, continued on page 6 class a, b, and c roof ratings helpful hints for achieving code compliance by howard hopper / regulatory services program coordinator 2014 issue 1 2 facing a brave new (and green) world 3 the underlying. What is ul class a? » ul class a, b or c is a measure of the external spread of flame on a roof surface. a number of fire test laboratories including underwriters laboratories (ul) and fm global (fm), conduct this test using either, class a, b, and c roof ratings helpful hints for achieving code compliance questions often arise about the construction needed to achieve a class a, b, or c fire rating for a roof assembly..

Roofing systems must meet or exceed building codes and insurance requirements. fire ratings may pertain to resistance to fire from above the roof system (the familiar class a, b, or c ratings), or fire exposure from the building interior (the underside of the roof deck)., standard for standard test methods for fire tests of roof coverings. Section 1505.4 class c roof assemblies class c roof assemblies are those that are effective against light fire-test exposure. class c roof assemblies and roof coverings shall be listed and identified as class c by an approved testing agency. code interpretation this code implies that all roof materials that pass the testing provided in the astm e 108 fire testing under the light category are ..., class a-b-c/i-ii-iii flame spread, class a-b-c roof coverings, and hourly fire-resistance ratings flame spread classes, roofing classes and hourly ratings are confusing terms and they sometimes get misused. the first is based on the astm e-84/ul 723 "test for surface burning characteristics of building materials." the second is based on astm e ....

Ul 790. standard: ul 790 standard test methods for fire tests of roof coverings (building integrated photovoltaics – bipv products only) certification required: the fire test sections are part of the standard that can be completed by intertek and certified with the etl mark., class a roofing. class a roofing is the preferred choice for any home, but this type of roofing is particularly important if you live in an area that is prone to wildfires.to achieve a class a rating, the roof must be effective against severe fire exposure..

This article describes testing and standards for fire ratings and fire resistance of asphalt shingles and other roofing materials. we also provide a master index to this topic, or you can try the page top or bottom search box as a quick way to find information you need.. readers should see our complete list of standards for roofing and roofing products.