Carpenters build or remodel almost every kind of structure, including houses and commercial buildings, bridges, churches, factories, and highways. They work with power and hand tools to build wood framing for houses, roofs, stairs, decks, sheaths, and forms for concrete. Carpenters install doors, windows, handrails, build cabinets, and counter tops. Carpenters perform interior and exterior finish work. They read blueprints, measure accurately, and calculate dimensions. Commercial carpenters construct metal framing and dry wall, they are key in instillation of acoustical ceilings, as well as vapor barrier and insulation. Carpenters are involved in new construction, building renovations and remodeling work.