Light gauge steel

Light gauge steel framing uses thin galvanized steel sheet, cold-rolled into C, U and similar sections, screwed together to form wall, floor and roof frames. The logic mirrors timber frame: closely spaced studs carry the load, insulation fills the cavities, and boards line both faces.

Why designers choose it

• Members are cut and punched to size on computer-controlled machines, so assembly is fast and dry.
• It does not rot, attract insects or shrink and warp.
• A light structure means smaller seismic forces and lighter foundations.
• It suits rooftop extensions and lightweight additions to existing buildings.

What to watch

Steel conducts heat well, so studs act as thermal bridges; a continuous layer of insulation on the outside solves this. Fire resistance comes from the lining boards. Details must protect the zinc coating and avoid trapping moisture inside the wall.

Light gauge steel is often the primary structure, but the studs behind ordinary plasterboard partitions belong to the same family. Being clear about which one a drawing means matters for both cost and structural calculations.