Through the responsible development of innovative and sustainable building products, CertainTeed has helped shape the building products industry for more than 110 years. Founded in 1904 as General Roofing Manufacturing Company, today, CertainTeed® is North America’s leading brand of exterior and interior building products, including roofing, siding, fence, decking, railing, trim, insulation, gypsum and ceilings. A subsidiary of Saint-Gobain, one of the world’s largest and oldest building products companies, CertainTeed and its affiliates have more than 5,700 employees and more than 60 manufacturing facilities throughout the United States and Canada.

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https://www.certainteed.com/about-certainteed/

“At Owens Corning, we strive every day to make the world a better place. Our track record, now surpassing 75 years, shows sustained results in this pursuit. Our history also shows market-leading businesses in insulation, roofing and fiberglass composites.

For the most part, our products and industries did not exist until we invented them. Our product portfolio has advanced over the years, of course. The advances reflect customers’ growing needs for quality, value and performance. Today, Owens Corning operates in three segments: insulation, roofing and asphalt, and composite solutions.”

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https://owenscorning.com/

Founded in 1886, GAF has become North America’s largest manufacturer of commercial and residential roofing (Source: Fredonia Group study).

Our success in growing the company to nearly $3 billion in sales has been a result of our relentless pursuit of quality, combined with industry-leading expertise and comprehensive roofing solutions.

Whether it’s for residential or commercial roofing applications, professional installers have long preferred the rugged, dependable performance that only a GAF roof can offer.

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https://www.gaf.com/en-us/our-company