We are a GAF-ELK certified contractor. GAF-ELK is North America's largest roofing manufaturer. As a GAF-ELK certified contractor, we've earned a special status that only 10 out of 100 contractors have achieved! It means we are eligible to offer GAF-ELK's System Plus Ltd. Warranty. This warranty covers your entire roofing system, not just the shingles. And it's backed by GAF-ELK!