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Serving Alberta's Roofing Industry Since 1961

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Roofing Application Standards Manual

ARCA divides roof systems and materials into two classifications: low slope and steep slope. Low slope roofing includes water impermeable, or weatherproof, types of roof membranes installed on slopes less than or equal to 2:12. Steep slope roofing includes watershedding types of roof coverings installed on slopes exceeding 4:12.

Low-Slope roofing

There are three classifications of low slope roof membranes or systems.

Steep-Slope Roofing

There are four classifications of steep slope roof coverings.