Roof Class Ratings

These ratings are presented below.

Roof class ratings.

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. We have collected reviews on more than 30 different brands of roofing shingles. Class a is the highest rating offering the highest resistance to fire and unrated is the worst. 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.

The shingles with the highest level of satisfaction appear first lower levels come later in the list. 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. By design a tile roof is allowing air circulation under the tile which reduces heat transfer to the attic during a fire. These tests may be conducted at ul inc fm global or any other certified testing laboratory.

How are roofs rated. Class a class b class c or unrated. The fiberglass provides the strength while the asphalt often mixed with. Your roof can have one of four fire ratings classifications.

Roofing systems must meet or exceed building codes and insurance requirements. 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. 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. 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. If you live in an area that s prone to hail this is the shingle you need. Astm e108 defines fire test methods for roof coverings.