Installing flooring, windows, doors, interior trim, cabinetry, solid surface, roofing, framing, siding, flooring, insulation, acoustical ceilings, computer-access flooring, metal framing, wall partitions, office furniture systems, and both custom or factory-produced materials, trim and molding, ceiling treatments, exposed columns and beams, displays, mantels, staircases, metal studs, metal lath, and drywall