Builders FirstSource is a distributor of building materials and services to homebuilders in the United States. The company offers roof and floor trusses, joist floor systems, wall panels, interior and exterior doors, aluminum and clad windows and dimensional lumber products. It also offers moldings, concrete blocks, countertops, cabinets, fireplaces, power tools and builder hardware products. In addition, it provides installation services for various products, including windows and doors, kitchen cabinets, stair rails, countertops, garage doors, insulation and siding. The company operates manufacturing plants in Alabama, Florida, Georgia, Indiana, New Jersey, North Carolina, Ohio and South Carolina. Builders FirstSource has been operational since 1998 and maintains a location in Knoxville, Tenn.