Class c fire resistant roofing material.
Roofing material fire ratings.
Understanding roof fire ratings class a roofing.
Ul 790 underwriters laboratories roof fire ratings a b c tests.
This month let s take a closer look at one particular type fire ratings.
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.
But by including a particular underlying material it can meet the requirements for a class a roof.
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.
Wood shake plywood or particle board roof are the most common roofing types listed as class c.
Class a does not mean grade a roofing systems are rated by realistic fire tests.
In a recent roofing column we focused upon technical information that could be found on roofing material wrappers that could verify compliance with various building codes.
The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c.
Fires that originate outside of the structure itself.
Astm ul 790 tests for fire resistance of roof covering materials underwriters laboratories has defined the ul 790 standard tests of roofing material fire resistance to external fire sources.