GAF is the largest roofing manufacturer in North America. Founded in 1886, they are known for both residential and commercial roofing systems. What GAF offers: - Residential: Asphalt shingles, luxury shingles, roofing accessories, underlayments, ventilation, gutters - Commercial: TPO, PVC, EPDM membranes, modified bitumen, roof coatings, insulation - Systems: Complete roofing systems backed by warranties up to 50 years - Certified Contractor Network: Extensive network of factory-certified roofing contractors across the US for... read full review »