Ply Gem-Cornerstone Building Brands

ABC Supply Co., Inc. is the nation's largest wholesale distributor of roofing, and one of the largest distributors of siding, windows and other exterior building products.

Johns Manville, a Berkshire Hathaway company, is among the leading manufacturers and marketers of building insulation, commercial roofing, roof insulation and specialty products for commercial, industrial and residential applications. The company s product offerings include formaldehyde-free fiberglass building insulation, commercial roofing membranes and roof insulations, filtration media, mats and reinforcements. In business since 1858, the company has annual sales of approximately $2.5 billion and holds leadership positions in all of the key markets that it serves. Johns Manville employs approximately 8,500 people and operates nearly 45 manufacturing facilities in North America, Europe and China. Johns Manville maintains a location in Waterville, Ohio.