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- C joists 150 – 300 mm, to 2.4 mm
- Rim tracks, web stiffeners, blocking
- Loose members or factory cassettes
- Service holes in line
- Deck: particle board, plywood, cement board or steel deck
- Floors for houses, mid-rise and mezzanines
What it is
Floor joists span between load-bearing walls or steel beams and carry the floor deck. Rim tracks close the ends, web stiffeners take concentrated loads at bearings, and bridging or strapping prevents the joists from rolling.
| Joist | BMT | Typical span |
|---|---|---|
| C 150 | 1.0 – 1.6 mm | short spans, ceilings |
| C 200 | 1.15 – 2.0 mm | residential floors |
| C 250 – 300 | 1.5 – 2.4 mm | longer spans, heavier loads |
Spans depend on loads, deflection and vibration limits – every floor is designed for the project.
Cassettes
Prefabricated floor cassettes – joists, rim tracks and deck assembled in the factory – are lifted into place in minutes and give a working platform immediately.
Standards and requirements by market
Codes World Steel designs, fabricates and documents this product to – and the key geometric and load requirements in each market.
United States
- AISI S100Cold-formed steel structural members
- AISI S240Cold-formed steel structural framing
- ASTM A1003 / C955Sheet steel and load-bearing studs
- IBC Ch. 22Steel – cold-formed framing
- Coating
- G60 (Z180) minimum for structural framing members
Australia / NZ
- AS/NZS 4600Cold-formed steel structures
- NASH StandardResidential and low-rise steel framing, Parts 1 & 2
- AS 1397Steel sheet and strip – G550, Z / AZ coatings
- NCCBuilding Code of Australia
- Corrosion
- coating class to NASH / AS 4312 exposure
Europe
- EN 1993-1-3Cold-formed members and sheeting
- EN 1090-4Execution of cold-formed structural elements
- EN 10346Continuously hot-dip coated steel – S350GD – S550GD
- EN 1993-1-1General rules
- CE
- EN 1090-1 for structural kits
Summary for orientation only – the project specification, the adopted code edition and the authority having jurisdiction govern.
Finishes
| Finish | Standards / notes |
|---|---|
| Frame | Z275 / AZ150 |
