Gannon Roofing Supply works with over 100 suppliers and manufacturers through the United States and the world to provide you with a full portfolio of quality exterior building products at competitive prices.  We stock and deliver the products and brands professional contractors need.  View our preferred partners by product group below.

Residential Roofing

Certainteed Owens Corning Malarkey Ecostar Metro Roofing Products American International Forest Products Metal Sales American Building Components

Residential Accessories

Lomanco Velux Klauer

Commercial Roofing



Midstates Asphalt

Commercial Accessories

Milcor Marathon OMG Atlas Hunter Georgia Pacific USG International Bildrite Cordeck

Sealants and Coatings

Inland Coatings Eternabond Karnak ER Systems


Certainteed Royal Revere Klauer

Windows and Doors

Alliance Window Systems MI Windows and Doors Thermatru Thermatru