Is rolled roofing Class A?

Assembly-rated Class A roof coverings are those that meet Class A standards when combined with other elements. For example, shake roofing with a fire-retardant treatment rates Class B on its own, but achieves a Class A rating when combined with specified underlying materials such as Type 72 roll roofing material.

What is a Class A roof type?

Common Class A roof coverings include asphalt fiberglass composition shingles, concrete and flat/barrel-shaped tiles. Some materials have a “by assembly” Class A fire rating which means, additional materials must be used between the roof covering and sheathing to attain that rating.

What is a Class A roof assembly?

Class A roof assemblies are those that are effective against severe fire test exposure. Class A roof assemblies and roof coverings shall be listed and identified as Class A by an approved testing agency. Class A roof assemblies shall be permitted for use in buildings or structures of all types of construction.

What is the difference between Class A and Class B roof?

This standard includes three classes of fire exposure: • Class A roof coverings, which are effective against severe fire test exposures • Class B roof coverings, which are effective against moderate fire test exposures • Class C roof coverings, which are effective against light fire test exposures.

Are asphalt shingles Class A?

Due to the materials used in their construction, most asphalt shingle roof assemblies have a Class A fire resistance rating.

Rolled Roofing Issue

What are the class ratings for shingles?

The classification is as follows: Class 1 shingles can withstand ice balls that are 31.8 mm or 1.25 inches in diameter. Class 2 shingles can withstand ice balls that are 38.1 mm or 1.5 inches in diameter. Class 3 shingles can withstand ice balls that are 44 mm or 1.75 inches in diameter.

What is a Class B roof?

Class B roof assemblies are those that are effective against moderate fire-test exposure. Class B roof assemblies and roof coverings shall be listed and identified as Class B by an approved testing agency.

Which is a Class A material?

Class A. Class A fires involve ordinary combustible materials, such as cloth, wood, paper, rubber, and many plastics. Extinguishers with an A rating are designed to extinguish fires involving these ordinary combustible materials.

What does a Class A material mean?

Fire class ratings classify materials by their ability to support and promote a fire. Class A, or Class 1, is the best fire rating, meaning any material with this rating does not burn well and is unlikely to contribute fuel to a fire. These materials include cement bricks.

Is TPO roofing Class A?

Fire-Rated, Class A – Both TPO and EPDM membranes are Class A fire-resistant.

What is a Class A flat roof?

Class A materials include flat or barrel-shaped roof tiles, fiberglass asphalt composition shingles, and metal roofs (i.e., steel or copper). Fire-retardant pressure-treated shakes and shingles are the most common Class B roofing material.

What is a Class A roof in California?

Class A roof assemblies include those with coverings of brick, masonry and exposed concrete roof deck. Class A roof assemblies include ferrous or copper shingles or sheets, metal sheets and shingles, clay or concrete roof tile, or slate installed on noncombustible decks.

Is TPO a Class C roof covering?

PVC and TPO products are both available with a Class A rating, although TPO is the most common commercial roof. Acrylic and silicone roof coating may have a UL Class A fire rating. However, they are part of a commercial roofing system and that entire system must be considered when determining the roof's fire rating.

Is a metal roof a Class B roof?

Metal roofing is designated with a Class A fire rating. The National Fire Protection Association (NFPA) is responsible for appointing the different fire prevention classifications for roof coverings. The Class A Fire Rating proves that a metal roof covering can: Experience maximum flame spread of 6 feet.

What is a Class C roof?

• Class C roof coverings, which are effective against light fire test exposures. Under such exposures, the roof coverings afford a degree of fire protection to the roof deck, do not slip from position, and are not expected to produce flying brands.

What is a Class B shingle?

Class B – Class B shingles can withstand moderate surface and a maximum flame spread of eight feet. Pressure-treated shakes and shingles usually fall in this category. Class C – Most contractors wouldn't recommend installing class C roofing, given that these can only provide light fire protection.

What is a Class A rating?

Flame spread classifications are developed using the American Society for Testing and Materials (ASTM) “tunnel test.” Class A fire ratings indicate flame-spread of 0-25 and smoke developed between 0-450 and is the highest of the ratings. The Class A or Class I rating indicates superior fire protection.

What is a Class B material?

In fire classes, a Class B fire is a fire in flammable liquids or flammable gases, petroleum greases, tars, oils, oil-based paints, solvents, lacquers, or alcohols. For example, propane, natural gas, gasoline and kerosene fires are types of Class B fires.

What is a Class C material?

A Class C or Class 3 fire rating has a flame spread rating between 76 and 200. This rating incorporates building materials like plywood, fiberboard, and hardboard siding panels. It also includes any of the faster burning whole woods.

What are Class A1 materials?

Stringent tests must be passed in order for construction products to reach a Class A rating. As above, A1 rated products do not require additional safety tests given they are completely non-combustible. Examples of these materials include aluminium, natural stone, concrete and porcelain.

What is the difference between Class A and Class B fire rating?

Class A fire retardants have a flame spread rating of between zero and 25. These materials are effective against severe fire exposure. Class B fire retardants have a flame spread rating of between 26 and 75. These materials are effective against moderate fire exposure.

Is paper a Class A fire?

Class A: Ordinary solid combustibles such as paper, wood, cloth and some plastics. Class B: Flammable liquids such as alcohol, ether, oil, gasoline and grease, which are best extinguished by smothering.

What is a Class 2 shingle?

A class 2 is able to withstand a 1.5-inch diameter object dropped at 14 feet. Class 3 shingles can handle a 1.75-inch object being dropped from 17 feet, and class 4 shingles can take a 2-inch object from 20 feet.

Who makes a Class 4 shingle?

Owens Corning Roofing offers several shingles with a Class 4 rating: TruDefinition® Duration FLEX®: This SBS modified asphalt shingle provides built-in flexibility for ease of install, absorbs energy during impact from hailstones or debris, and withstands daily stresses for enhanced durability.

What class is a 30 year shingle?

30 year impact resistant shingles vary in strength from class 1 to class 4. The type of class determines the material and the resistance of the shingle. Generally class 4 is the highest level of protection making the shingle less susceptible to hail damage or damage from other storms or weather debris.