Roof Class Ratings

Astm e108 defines fire test methods for roof coverings.

Roof class ratings.

Your roof can have one of four fire ratings classifications. We have collected reviews on more than 30 different brands of roofing shingles. Roofing systems must meet or exceed building codes and insurance requirements. Asphalt shingles are made of fiberglass sandwiched between asphalt and ceramic granules.

The shingles with the highest level of satisfaction appear first lower levels come later in the list. These tests may be conducted at ul inc fm global or any other certified testing laboratory. Class a class b class c or unrated. Fire ratings for roofs are classified as either class a class b class c or are unrated if a roof covering cannot meet the requirements for any of these classifications.

How are roofs rated. Class a is the highest rating offering the highest resistance to fire and unrated is the worst. A class a roof is ideal for fire protection and may be required by your building codes depending on your place of residence. Tile roofs achieve the highest attainable fire rating for both the product and installed system.

These ratings are presented below. After performing the test roofing manufacturers would be scored based on the resistance of the material getting a rating from 1 least hail resistant to 4 most hail resistant. Class f 110 mph class g 120 mph and class h 150 mph homeowners should be aware that wind velocity varies across a roof and causes different uplift pressuresdepending on wind gusts the landscape surrounding the home the shape of the roof and the design of the roofedge. 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.

The benefits of northgate s sbs modified formula include a class 4 impact resistance rating the industry s highest superior weatherability and improved granule adhesion which make this arguably the most durable shingle in the industry. Summarizing the result we would be looking at for a class 3 roof is earned if the sample does not crack when hit twice in the same spot by a 1 75 inch diameter steel ball. The class a fire rating includes tests for spread of flame intermittent flame and the burning brand.