The work of the plasterer includes the application of plaster to interior walls and ceilings in order to produce a fine finished surface. They are also engaged on the application of protective coverings of cement, plaster and similar materials to the outside of building surfaces. The work also involves the preparation of surfaces by fastening metal or wooden laths to hold plaster. In addition, a plasterer may be required to lay the finishing surface of cement floors for houses, factories and garages. Plasterers are generally employed in the construction industry or may be self-employed.