Carpenters are among the largest group of workers in the building trades. The vast majority of them work for contractors involved in building, repairing, and remodeling buildings and other structures. Manufacturing firms, schools, stores, and government bodies employ most other carpenters. There are residential carpenters, who specialize in homes and condominiums; commercial carpenters, who work on commercial office buildings, hospitals, hotels, schools, and shopping malls; and industrial carpenters, who work in industrial settings.

Carpenters do two basic kinds of work: rough carpentry and finish carpentry. Rough carpenters construct and install temporary structures and supports and wooden structures used in industrial settings, as well as parts of buildings that are usually covered up when the rooms are finished. Among the structures built by such carpenters are scaffolds for other workers to stand on, chutes used as channels for wet concrete, forms for concrete foundations, and timber structures that support machinery. In buildings, they may put up the frame and install rafters, joists, subflooring, wall sheathing, prefabricated wall panels and windows, and many other components.

Finish carpenters install hardwood flooring, staircases, shelves, cabinets, trim on windows and doors, and other woodwork and hardware that make the building look complete, inside and outside. Finish carpentry requires especially careful, precise workmanship, since the result must have a good appearance in addition to being sturdy. Many carpenters who are employed by building contractors do both rough and finish work on buildings.

Although they do many different tasks in different settings, carpenters generally follow the same basic steps. First, they review blueprints or plans (or they obtain instructions from a supervisor) to determine the dimensions of the structure to be built and the types of materials to be used. Sometimes local building codes mandate how a structure should be built, so carpenters need to know about such regulations.

Using rulers, framing squares, chalk lines, and other measuring and marking equipment, carpenters lay out how the work will be done. Using hand and power tools, they cut and shape the wood, plywood, fiberglass, plastic, or other materials. Then they nail, screw, glue, or staple the pieces together. Finally, they use levels, plumb bobs, rulers, and squares to check their work, and they make any necessary adjustments. Sometimes carpenters work with prefabricated units for components such as wall panels or stairs. Installing these is, in many ways, a much less complicated task, because much less layout, cutting, and assembly work is needed.

Carpenters who work outside of the building construction field may do a variety of installation and maintenance jobs, such as repairing furniture and installing ceiling tiles or exterior siding on buildings. Other carpenters specialize in building, repairing, or modifying ships, wooden boats, wooden railroad trestles, timber framing in mine shafts, woodwork inside railcars, storage tanks and vats, or stage sets in theaters.

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