What does a Class A roof mean?

Class A is the highest rating, offering the highest resistance to fire, and unrated is the worst. Examples of a Class A roof covering include concrete or clay roof tiles, fiberglass asphalt composition shingles and metal roofs. … A burning ‘Class A’ brand on a fiber cement roof covering during the fire test.

What is the difference between Class A and Class C roofing?

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.

What is a Class B roof covering?

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.

What is a UL Class A roof?

A roof is classified as Class A as the result of one or three tests, the external spread of flame, intermittent flame and burning brand (ASTM E108 or UL 790 Standard). … If any component is utilized in an assembly that is not listed in the respective layer, it will nullify the Class 1 rating for the entire roof assembly.

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What is a Class C roof covering?

• 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 are Class A roofing materials?

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 3 or 4 roof?

Shingles are granted a rating of Class 1, 2, 3, or 4 based on the degree of impact they can withstand without cracking. The highest rating is Class 4, offered by most major roofing manufacturers. … To achieve Class 3 rating, the shingle must withstand a 1 ¾-inch steel ball dropped from 20 feet.

What is a Class 2 roof?

A Class 2 impact shingle is one that has been assigned a Class 2 rating by Underwriters Laboratory, or UL. … A shingle is assigned a Class 2 rating if it does not rupture or crack when hit by 1.25-inch balls dropped from 20 feet above. The highest rating is Class 4.

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

Fire Retardant Classifications

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.

What are Class 4 shingles?

Shingles that are “impact resistant” are considered a class 4 product, and are designed to withstand high winds and hail damage. These shingles may be made of copper, aluminum, resin and plastic. Shingles with the Class 4 rating have an impact resistance rating of UL 2218.

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What is a roof UL type?

(UL) is an independent product safety certification organization. Established in 1894, the company has its headquarters in Northbrook, Illinois. … The presence of the UL logo merely shows that a product, e.g. rolled roofing material, membrane, or coating is part of a tested system that meets the UL criteria.

What are the classification of roof?

Presently, the most common classification of roofs is of two broad forms. Namely; Flat roofs and Pitched roofs. The construction of flat roofs need to meet three basic functions; insulation, waterproofing and construction.

What is a UL Class A fire rating?

Class A designates resistance to relatively severe fire-test exposure; Class B designates resistance to relatively moderate fire-test exposure; and Class C designates resistance to relatively light fire-test exposure.

What is Class C material?

Class C – Flame-spread 76-200, smoke developed 0-450. NFPA 101 primarily applies this classification to interior wall and ceiling finish materials. Roof coverings must meet a different set of criteria.

What pitch is a 40 degree roof?

Roof Slope in Degrees to Standard Roof Pitch Conversion Tables

Convert Roof Slope from Degrees to Rise-in-Run
38° 9.375 in 12
39° 9.717 in 12
40° 10.069 in 12
41° 10.431 in 12

What is class F Wind rating?

This testing method measures a shingle’s ability to withstand fan-induced wind speeds and includes three classifications: Class A for shingles that passed testing at 60 mph. Class D for shingles that passed testing at 90 mph. Class F for shingles that passed testing at 110 mph.

Roofs and roofing