Light-gauge steel site cabins: how they differ and when they pay off
LGSF stands for light-gauge steel framing. Here is how a frame of cold-formed galvanised profiles differs from the familiar welded one, where it honestly wins, and where it loses.
What light-gauge steel framing is
Light-gauge steel framing (LGSF, known in Russian as ЛСТК) is a structural frame built from cold-formed galvanised profiles, typically 0.7 to 2 mm thick. The profiles are roll-formed in a factory to tight tolerances and assembled with bolts and self-drilling screws rather than welded on site.
A conventional site cabin is built differently: it has a welded frame of structural tube or plain rolled steel, with floor beams and corner posts 2–3 mm thick. In the INTERMODULE block container specifications this is exactly the case — 2 mm in the base series and up to 3–4 mm in the premium one.
How the two compare in practice
| Parameter | Light-gauge steel | Welded rolled-steel frame |
|---|---|---|
| Steel thickness | 0.7–2 mm | 2–3 mm (up to 4 mm in posts) |
| Corrosion protection | Full factory galvanising, edges included | Primer and paint, needs re-coating over time |
| Structure weight | Lower — less load on the foundation | Higher |
| Assembly | Bolts and screws, no site welding | Welding |
| Thermal bridging | Reduced when slotted thermal profiles are used | Steel conducts heat across the full section |
| Transport and stacking | Require calculation — thin profiles are sensitive to point loads | Withstands repeated transport and crane handling |
Where light-gauge steel genuinely wins
Corrosion. Zinc is applied at the mill across the whole profile, and at cut edges it partially self-heals the exposed steel. For wet rooms — showers, sanitary blocks, sites near water — this is a real advantage over painted rolled steel, which eventually needs touching up.
Thermal performance. A slotted thermal profile breaks the direct heat path through the metal. In an ordinary welded frame the post acts as a thermal bridge: frost outside, warmth inside, and the steel conducts the cold straight through. In Kazakhstan, with −40 °C winters, that is not a detail.
Weight and foundation. A lighter frame puts less load on the pad and can sometimes allow a simpler foundation. Crane lifts also cost less.
Where the conventional frame is the honest choice
If the cabin will be moved often. A construction site is a rough environment: sling lifts, gravel-road transport, installation that is not always careful. Thick rolled steel forgives that treatment; thin profiles do not — they have to be engineered for the specific loads.
If modules will be stacked. Multi-storey layouts and stacking depend on the load capacity of posts and corner fittings. A welded frame with 3–4 mm corner posts has that margin built in.
If you need a fast, off-the-shelf order. Standard series are produced on welded frames and are held in stock; a light-gauge build is a separate engineering project, which means a different lead time.
Where INTERMODULE stands on light-gauge framing
In the INTERMODULE technical questionnaire (form in Russian), building frame type is a dedicated field, and light-gauge steel is listed there as one option alongside formed sheet and plain rolled steel. So a light-gauge build is on the table — not as a catalogue item, but as an engineered solution: loads, number of storeys, climate and whether the unit will be relocated all have to be fixed first.
Standard site cabin and block container series are produced on welded frames from 2–3 mm rolled steel — a proven solution for mobile units that survives transport and crane handling.
