Joist

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joist

[jȯist]
(civil engineering)
A steel or wood beam providing direct support for a floor.

Joist

One of a series of parallel timber beams used to support floor and ceiling loads, and supported in turn by larger beams, girders, or bearing walls; the widest dimension is placed in the vertical plane.

ceiling joist

Any joist which carries a ceiling; one of several small beams to which the ceiling of a room is attached. They are mortised into the sides of the main beams or suspended from them by strap hangers.

floor joist

Any joist or series of joists which supports a floor.

solid-web joist

A conventional joist with a solid web formed by a plate or rolled section, as opposed to an open-web joist.

trimming joist

A joist supporting one end of a header at the edge of an opening in a floor or roof frame, parallel to the other common joists.

joist

joists in a flooring system
joist
One of a series of parallel beams of timber, reinforced concrete, or steel used to support floor and ceiling loads, and supported in turn by larger beams, girders, or bearing walls; the widest dimension is vertically oriented. Also see binding joist, boarding joist, bridging joist, ceiling joist, common joist, floor joist, principal joist, sleeper joist.