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| CertainTeed Roofing Manufactures asphalt and fiberglass shingles for low and steep slope commercial, industrial, institutional, and residential roofing. Also offers waterproofing applications. http://roofing.certainteed.com/ |
| Elk Corporation Manufacturer of laminated fiberglass shingles for the roofing industry. http://www.elkcorp.com/ |
| GAF Materials Corporation Manufacturers of roofing shingles and related supplies. http://www.gaf.com/ |
| IKO Develops and manufactures residential and commercial asphalt and modified bitumen shingles and other roofing products. http://www.iko.com/ |
| Ondura Corporation Manufactures corrugated asphalt roofing tiles and sheets for residential, commercial, and agricultural construction. http://www.ondura.com/ |