Key points
- Cold-formed steel (CFS) is structural sheet steel roll-formed into C sections and other shapes at room temperature.
- Steel is non-combustible, doesn't fuel fire, resists termites and rodents, doesn't absorb moisture and doesn't support mould.
- Studs stay straight and dimensionally stable, and all CFS framing contains 25% or more recycled steel.
- Corrosion protection is set by coatings and detailing for the exposure; steel conducts heat, so insulation must deal with thermal bridging.
In light steel framing the structure is neither concrete nor timber, but light galvanised steel sections closed with boards (cement, gypsum, OSB) with insulation between them.
1) What is it?
Cold-formed steel consists of framing members made from structural-quality sheet steel, formed by manufacturers into C sections and other shapes at room temperature, without added heat, using roll-forming machines; it arrives as galvanised coil that is progressively shaped into studs, track, joists and channels1.
2) Advantages
From the Steel Framing Industry Association (via BuildSteel)1:
- Non-combustible: steel doesn't fuel fire.
- Pest-resistant: rodents, termites and insects.
- Doesn't absorb moisture or support mould growth.
- Dimensional stability: members stay straight, supporting clean finishes.
- Recycled content: 25% or more, and recyclable.
3) Points needing attention
- Corrosion: designers address corrosion protection through coatings and detailing based on the project's exposure conditions1; this matters greatly in coastal and humid cities.
- Thermal bridging: steel conducts heat well, so steel studs carry heat across the wall if insulation is only between the studs. Walls are therefore usually designed with a continuous external insulation layer (a well-known envelope design point). See thermal insulation.
- Fixing to walls: needs backing behind the boards or fixing into the studs.
- Approval: check the approved structural design and municipal and civil defence requirements for the building type.
4) Pros and cons
Pros
- Fast, light and dimensionally accurate.
- Doesn't burn, rot or get eaten by termites.
- Suits annexes and light additional floors.
Cons
- Vulnerable to corrosion if galvanising is damaged or in salty environments.
- Thermal bridges needing continuous insulation.
- Needs specialised trades and tools.
Sources
The number next to a statement points to its source in this list. Sources back the general information; anything marked “practical advice” is editorial experience, not a quoted source. Anything that affects safety, structural design or electrical installations needs a licensed professional, and in Saudi Arabia the binding reference is the Saudi Building Code.
- 1Cold-Formed Steel (CFS) Framing 101: A Practical Guide — Steel Framing Industry Association — BuildSteel.org