Underwriters Laboratories Impact Resistant Roof

The weakest material receives a rating of one and the material that can absorb the most impact enjoys a 4 rating. Two companies underwriters laboratories ul and fm approvals are typically used to rate the impact resistance of roofing materials according to mark graham with the national roofing contractors association. Spread of flame ul 790 burning brand testing ul 790 impact test ul 2218 intermittent flame testing ul 790 solar reflectance thermal emittance coating thickness astm c1549 and c1371 wind resistance astm d3161 wind uplift ul 1897 10x10 and 12x24 deck.

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Underwriters laboratories ul developed the ul 2218 test to rate the strength of roofing shingles.

Underwriters laboratories impact resistant roof.

This test determines if a roofing material is rated class 1 2 3 or 4. Impact resistant shingles are usually engineered in two ways. Considered a class 4 product impact resistant shingles can be made of steel rubber asphalt with sbs rubber asphalt with special matting materials aluminum copper and resin. Roof coverings that have passed the ul standard 2218 test are classified by ul as either class 1 2 3 or 4.

This test is called the ul 2218 impact rating. Aside from hail impact these materials can withstand high winds of up to 110 mph. In ul testing steel balls of different sizes are dropped from varying heights onto newly manufactured roof coverings. Roofing materials are rated based on their ability to absorb high impact contact from hail or flying debris.

Our testing services assess compliance to the following ul and industry standards. Ul standard ul 2218 edition 2 impact resistance of prepared roof covering materials edition date. Most roofing material with a class 4 impact rating is considered impact resistant roofing. A reinforcing polymer based mesh is added to the back of a standard asphalt shingle.

Underwriters laboratories ul is a not for profit independent testing organization that was founded in 1894. Roof coverings must be tested and approved by underwriters laboratories ul or factory mutual fm and be rated as a class 1 2 3 or 4. The impact resistance classification class 1 class 2 class 3 class 4 of the product under u l. Ul developed a test to rate the strength of roofing materials.

Impact resistant shingles are recommended for homes in areas that see frequent hailstorms or other higher impact debris. Impact resistant shingles have a class 3 or class 4 ul 2218 rating. This mesh is embedded into the asphalt and helps holds the shingle together preventing the shingle from splitting when impacted by a hailstone or other object. The proper underwriter s laboratories label or label from any other testing lab approved by the texas department of insurance.

Ul provides the knowledge and expertise to help consumers make informed decisions on products that affect their daily lives. January 25 2010 ansi approved. Class 4 roof covering is the most impact resistant roof and receives the highest premium discount.