Roof Class Ratings

Your roof can have one of four fire ratings classifications.

Roof class ratings.

These ratings are presented below. 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. If you live in an area that s prone to hail this is the shingle you need. 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.

The class a fire rating includes tests for spread of flame intermittent flame and the burning brand. These tests may be conducted at ul inc fm global or any other certified testing laboratory. A class a roof is ideal for fire protection and may be required by your building codes depending on your place of residence. Roofing systems must meet or exceed building codes and insurance requirements.

Astm e108 defines fire test methods for roof coverings. 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. 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. How are roofs rated.

Class a class b class c or unrated. The fiberglass provides the strength while the asphalt often mixed with. Class a is the highest rating offering the highest resistance to fire and unrated is the worst. Asphalt shingles are made of fiberglass sandwiched between asphalt and ceramic granules.

We have collected reviews on more than 30 different brands of roofing shingles. 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. The shingles with the highest level of satisfaction appear first lower levels come later in the list.