Asphalt shingles are the most common residential roofing material in the United States. They are durable and they cost less than other shingle types. That’s why it’s no surprise that tons of roofing manufacturers are offering them across the country. But, out of all of these roofing companies, GAF is the largest player in the industry. GAF or General Aniline & Film is a well-known roof manufacturer in America that has earned its reputation ...