CertainTeed
CertainTeed is an industry leader, firmly established as one of America's most diversified building materials manufacturers. Its building products include ceiling systems, fiber cement siding, insulation, roofing shingles, clay roof tiles, vinyl siding and accessories, vinyl windows, ventilation products, vinyl fence, deck and railings and pipe products as well as foundation systems.

John's Manville
Johns Manville, a Berkshire Hathaway company, is a leading manufacturer and marketer of premium-quality building and specialty products. In business since 1858, the Denver-based company has sales in excess of $2 billion and holds leadership positions in all of the key markets that it serves. Johns Manville employs about 9,000 people and operates 43 manufacturing facilities in North America, Europe and China.

Knauf Insulation is a member of the multi-billion-dollar family of building materials companies owned by the Knauf family of Iphofen, Germany.