What is a roof UL classification?

Class four is an impact standard used to rate roofing materials like shingles and metal materials. … UL developed a test to rate the strength of roofing materials called the UL 2218 Impact Rating, which is the test that determines if a roofing material is Class 1,2,3, or 4.

What does roof UL type mean?

(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 is a Class 3 or 4 roof?

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. A Class 4 rating, the material should not get damaged when hit twice in the same spot by 2 inch diameter steel ball.

What are the classes of roofing?

Roof covering fire ratings are Class A, B, C, or unrated; with Class A providing the best performance. Common Class A roof coverings include asphalt fiberglass composition shingles, concrete and flat/barrel-shaped tiles.

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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 A UL?

Class A, B or C is the measure of a roof system’s ability to resist external fire. Class A is the best rating that can be achieved, which is described as “effective against severe fire exposure.” The susceptibility of a roof to fire is determined using either ASTM E108 or UL 790 standard.

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 a class four roof?

Class four is an impact standard used to rate roofing materials like shingles and metal materials. The hail standard UL 2218 essentially encompasses four different sized metal balls being dropped from different heights (to simulate hail, more or less). …

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.

What’s the difference between Class 3 and Class 4 shingles?

To receive a Class 4 rating, a roofing shingle must withstand having a 2-inch steel ball dropped multiple times from a height of 20 feet. … The difference between the ratings is that Class 3 shingles withstand a smaller steel ball dropped from a lower height, and likewise for Class 2.

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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 A rated roof?

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 are Class B roof coverings?

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 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 UL 263?

ANSI/UL 263, the Standard for Safety of Fire Tests of Building Construction Materials, and ASTM E119, Standard Test Methods for Fire Tests of Building Construction and Materials, were developed to simulate a building fire. … This is considered to be the standard time/temperature curve for buildings.

Roofs and roofing