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


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.


joists in a flooring system
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.
References in periodicals archive ?
If you need to connect new walls to old existing walls or attach soffits to old floor joists, make sure you have some self-tapping construction screws on hand before you start.
Its present state is down to a combination of some bricks being able to cantilever from the party wall and the ceiling joists not yet taking all of the load, but eventually gravity will win.
The joist and joist girder system supports the solar panels while limiting the required number of supports and the overall steel tonnage required, as well as minimizing the number of columns required to maintain an open space below.
Fix the board to the joist with nails or screws, using two fixings at each point that the board crosses a joist.
Each plank must have two screws fixed into each joist it spans across.
Panels were fabricated using spacer jigs to align the joists, and tension bridging was installed 203 mm from the end of each joist to give additional lateral support.
7 Once the frame of joists is in place, double check everything is square and properly nailed in place.
The gap between inner joists must be no greater than 400mm.
If so, work out where the joist is - this should be apparent from the row of nails - and drill new pilot holes through the board into the joist.
I cut lots of wooden batons to wedge between the joists to hold up the insulation.
This combination further diversifies SDI's product offering, provides additional penetration of the joist, truss and girder markets and provides SDI with its first foray into the processed raw materials arena," says Keith Busse, SDI's president and CEO.
TO AUTOMATE ITS MASS-DESIGN and' mass-production processes, New Columbia Joist Co.