How big is GAF?

How big GAF is depends on which GAF you mean, as the acronym refers to many entities of different sizes. The largest and most well-known GAF is GAF Materials Corporation, North America's largest roofing and waterproofing manufacturer, which is extremely big. GAF is headquartered in Parsippany, New Jersey, operates more than 30 manufacturing plants across the United States, employs over 4,000 people directly and many more through contractors, and generates annual revenues estimated at over 4 to 5 billion dollars as part of its parent company Standard Industries which has over 20 billion dollars in revenue. GAF produces enough shingles to cover hundreds of millions of square feet of roofs each year and holds about 25 to 30 percent of the US residential roofing market share with its Timberline shingles being the best-selling shingle in North America. If you mean GAF as in Government Aircraft Factory in Australia historically, it was a medium-sized government factory employing several thousand at its peak but now defunct. If you mean GAF as Global Assessment of Functioning in psychology, it is a 0 to 100 scale, so big in terms of range. If you mean gaf slang for house, big is subjective, but a typical gaff could be any size house. In roofing context, GAF is a huge industrial company with national distribution, extensive contractor network of over 10,000 Master Elite contractors, and is one of the largest building materials manufacturers in the world, privately owned by Standard Industries and the Heyman family.