The fundamental difference lies in where these companies sit in the supply chain. TopBuild and IBP are installers and distributors. They buy insulation from manufacturers like Owens Corning, mark it up, and install it in buildings. Owens Corning manufactures the product itself, dealing with commodity input costs and factory utilization rates.Installed Building Products ( NYSE:IBP ) operates similarly to TopBuild, installing insulation, garage doors, shower enclosures, and other building products. They focus ...