What Is Metal Stud Framing?

Cold-formed steel studs are made by passing thin sheet steel through forming rollers at room temperature, shaping it into a C-section profile. The process produces lightweight studs with consistent dimensions and dead-straight profiles, no warping, no twisting, no shrinkage from humidity changes. The stud sits in a U-shaped track at the top and bottom of the wall. Drywall screws fasten directly into the stud flange.

Service penetrations (electrical wires, plumbing) pass through pre-punched knockouts in the stud web, eliminating the need to drill on site.

In GTA construction, metal studs are the default framing for:

1. commercial fit-outs, office, retail, restaurant, medical
2. multi-unit residential corridors and party walls
3. high-rise residential interior partitions
4. fire-rated separations between dwelling units in townhouses and multiplex
5. wet areas where wood would mould (commercial kitchens, swimming pool enclosures)
6. ceilings, typical commercial T-bar suspended ceilings sit in metal stud framing
7. curved walls, metal studs bend more easily into curves than wood
8. high-walls, over 12 feet, structural metal stud framing remains straighter than equivalent wood.

Wood still dominates single-family residential construction in Ontario because it's cheaper and supported by a deep contractor pool, but metal takes over above 4-storey residential and across nearly all commercial work.

Gauge is the steel thickness, counter-intuitively, lower gauge numbers mean thicker (stronger) steel. Common gauges in GTA construction:

1. 25-gauge (0.0179"), lightest, non-structural, partition walls only
2. 22-gauge (0.0270"), slightly heavier non-structural for tall walls or heavily-loaded partitions
3. 20-gauge (0.0329"), light structural, used for tall walls and load-bearing in single-storey commercial
4. 18-gauge (0.0428"), heavier structural
5. 16-gauge (0.0538"), full structural, used for load-bearing in multi-storey CFS construction
6. 14-gauge (0.0677"), heaviest residential CFS, rare in non-commercial.

Non-structural partitions (most interior walls in commercial fit-outs) use 25-gauge. Anything carrying vertical load needs an engineered design specifying gauge, stud size, fastener pattern, and connections.

Standard metal stud widths:

1. 1-5/8", narrow partition walls, used between offices or as a furring layer
2. 2-1/2", typical interior partition
3. 3-5/8", most common partition size, equivalent to a wood 2x4
4. 6", equivalent to wood 2x6, used for exterior walls in CFS construction
5. 8", heavy walls or full structural CFS exterior walls. Spacing is typically 16" or 24" on centre. Commercial offices often use 24" spacing on non-load-bearing partitions to save material.

Fire-rated assemblies usually require 16" spacing per UL/ULC tested assembly. Heavy walls and load-bearing walls often spec 12" or even 8" spacing under engineered design. A typical Toronto commercial fit-out crew can frame 1,000+ square feet of metal stud partition wall per day, meaningfully faster than equivalent wood-stud framing because of pre-punched knockouts and screw-only assembly.