Steel floor joists in our LSF floor system frame floors, mezzanines and roofs in light steel framed buildings. C-joists come 6″ to 14″ deep in 20 to 12 gauge with matching rim track, and go up dry with the same screws as stud walls.
A cold-formed floor is a small kit of parts. Each one has a single job, and the structural design sets every size.
| Part | What it does |
|---|---|
| Cold-formed joist | Spans between walls or beams and carries the floor |
| Rim track | Caps the joist ends and holds them in line |
| Web stiffener | Stiffens the joist web at bearings and point loads |
| Blocking and bridging | Keeps joists straight and stops them rolling |
| Clips | Fix joists to rim track, headers and beams |
| Subfloor | Floor surface that braces the top flange (by others) |
88 joist sections cover most light steel floors. Joists usually sit at 16" or 24" on centre.
Rim track is steel track in the same depth as the joists, run along the floor edge. A 10" joist such as 1000S162-54 takes 1000T125-54 rim track.
Where a concrete slab goes on top, the deck choice changes how the floor works. Composite floor deck bonds to the slab and acts as its bottom reinforcement.
What engineers and framers ask before ordering joists.
It depends on depth, gauge, flange, spacing and load. Single spans commonly fall in the 10 to 30 ft range, and the engineer of record sizes each floor.
It is the same C-section family as a structural stud, in deeper 6" to 14" sizes, used horizontally with rim track and bridging.
The track along the ends of the joists at the floor edge. It closes the floor and gives the joist ends something to fasten to.