Definitions for "JOISTS"
Keywords:  ceiling, timber, beam, girders, laths
One of a series of parallel beams to which the boards of floor and ceiling laths or plaster boards are nailed and supported in turn by larger beams, girders, or bearing walls. Back to the Top
Timbers built into or hung from walls to provide support for floors or fixing for ceilings or both.
Small beams, usually not more than five inches thick, which are in parallel and support floors and ceilings. The joists are supported by larger beams, bearing walls, girders, etc. A joist is rectangular in cross-section, the narrow face being the joist, the wide face the plank.