GAF offers its customers the best roofing warranties in the industry. And because Integrity Roofing & Siding is a certified roofing contractor, you are assured that GAF manufacturer warranty coverage on installed roofing materials is fully valid. A San Antonio roofer who is not certified by GAF cannot guarantee your warranty will be in effect if and when you need it. The exterior of your home has several elements that make it stand out from your neighbors and your roof should be one of them. The San Antonio owens corning roofing system is much more than just a color of shingle today. There are many different styles from the traditional 3-tab roofing shingle to the architectural designer shingles, GAF has a style and color for every home. Our Lifetime Designer Shingles have options that look like slate and wood shake if you are looking to change the appearance of the roofing system.