Roof Class Ratings

These tests may be conducted at ul inc fm global or any other certified testing laboratory.

Roof class ratings.

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. Class a is the highest rating offering the highest resistance to fire and unrated is the worst. Your roof can have one of four fire ratings classifications. Asphalt shingles are made of fiberglass sandwiched between asphalt and ceramic granules.

How are roofs rated. Tile roofs achieve the highest attainable fire rating for both the product and installed system. 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 fiberglass provides the strength while the asphalt often mixed with.

We have collected reviews on more than 30 different brands of roofing shingles. 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. A class a roof is ideal for fire protection and may be required by your building codes depending on your place of residence. Astm e108 defines fire test methods for roof coverings.

The shingles with the highest level of satisfaction appear first lower levels come later in the list. Roofing systems must meet or exceed building codes and insurance requirements. 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. 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 a class b class c or unrated. The class a fire rating includes tests for spread of flame intermittent flame and the burning brand. By design a tile roof is allowing air circulation under the tile which reduces heat transfer to the attic during a fire.