Roof Class Ratings

Class a class b class c or unrated.

Roof class ratings.

Roofing systems must meet or exceed building codes and insurance requirements. Astm e108 defines fire test methods for roof coverings. 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. By design a tile roof is allowing air circulation under the tile which reduces heat transfer to the attic during a fire.

We have collected reviews on more than 30 different brands of roofing shingles. 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. 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 class a fire rating includes tests for spread of flame intermittent flame and the burning brand. Asphalt shingles are made of fiberglass sandwiched between asphalt and ceramic granules. A class a roof is ideal for fire protection and may be required by your building codes depending on your place of residence. Your roof can have one of four fire ratings classifications.

Tile roofs achieve the highest attainable fire rating for both the product and installed system. Class a is the highest rating offering the highest resistance to fire and unrated is the worst. If you live in an area that s prone to hail this is the shingle you need. 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. The fiberglass provides the strength while the asphalt often mixed with. These tests may be conducted at ul inc fm global or any other certified testing laboratory.