Kay Supply is a unique company focusing on specialty exterior products. Our inventory and services are available to Wholesale, Retail and Contractors. Kay Supply is a complete building supply center. We specialize in Metal Roofing, Asphalt Shingle Roofing, Vinyl Siding, and Diamond Kote Siding. We also offer a wide variety of Decking, Lumber, Windows, Doors, and Skylights. And, our products include a number of low energy products and materials.. Home owners and contractors now have a place to view one of the best showroom displays of its kind this side of the Mississippi. Whether building a new home,a commercial building or remodeling,you can now see full scale products and choose with confidence in what you will be purchasing. -Why deal with multiple contractors when all Custom Exteriors can do it all for you and your family