84 Lumber is a company that supplies building materials, building supplies, manufactured components and services for single- and multi-family residences and commercial buildings. It operates stores, component manufacturing plants, custom door shops, custom millwork shops, and engineered wood product (EWP) centers. The company also offers residential and commercial contractors installed services for a variety of products including framing, insulation, siding, windows, roofing, decking, and drywall.