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Your Complete Source for Single-Ply Commercial Roofs

Since its inception in 1969, Great Lakes Systems, Inc. has flourished in the highly-competitive commercial, industrial and institutional roofing field and enjoys industry-wide recognition for the quality of its installation repair and maintenance work as well as its client relationships.

Today, the Great Lakes‘ team adheres steadfastly to the work ethic, disciplines and principles of its founder, Ray Clausen, while continuing to innovate and improve its roof delivery methods thus improving the customer experience.

We exist to keep our customers dry. If you need a new single-ply commercial, industrial or institutional roof—whether you’re a building owner, architect, general contractor or facilities manager—you’re in search of a roofing contractor you can trust. You’ve come to the right place.