Gannon Roofing Supply carries an unmatched variety of steep-slope roofing products in stock. We warehouse a huge supply of basic architectural shingles from both Owens Corning, Certainteed, and GAF. We also carry the full line of Certainteed Landmark Premium, lifetime guaranteed shingles, as well as all colors of the Certainted XT-25 and selected colors of Owens Corning's Supreme three-tab lines. 

Need to accessorize? We stock five different colors of edge metal in three profiles, various brands of standard and synthetic underlayment, ice and water barrier, aluminum flashing, roof louvers, ridge vent, cap and starter shingles, penetration flashings, and fasteners.

We also have the ability to special order designer shingles like Owens Corning's Berkshire and Certainteed Presidential Shake, normally delivered in less than a week. We deal in a full line of metal roofing, synthetic slate, Energy Star certified products, and skylights. Bottom line?

If it belongs on a roof and you need it, or just need to know about it, we can help.