Underwriters Laboratories Impact Resistant Roof

January 25 2010 ansi approved.

Underwriters laboratories impact resistant roof. Ul provides the knowledge and expertise to help consumers make informed decisions on products that affect their daily lives. Roof coverings that have passed the ul standard 2218 test are classified by ul as either class 1 2 3 or 4. 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. 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.

Class 4 roof covering is the most impact resistant roof and receives the highest premium discount. Impact resistant shingles are usually engineered in two ways. To be impact rated these materials are tested using the ul 2218 standard which includes high velocity impacts from steel balls at various locations. Ul developed a test to rate the strength of roofing materials.

A reinforcing polymer based mesh is added to the back of a standard asphalt shingle. Who tests hail resistant roofs. 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. Ul standard ul 2218 edition 2 impact resistance of prepared roof covering materials edition date.