Light-Gauge Metal-Stud Framing for Non-Load-Bearing Partitions

Light-Gauge Metal-Stud Framing for Non-Load-Bearing Partitions

Light-gauge steel framing is the standard system for interior non-load-bearing partition walls in commercial and multi-family construction. The components are cold-formed from sheet steel, lightweight, dimensionally stable, and non-combustible. This lab builds a 10-foot partition with a door rough opening and a deflection head detail — skills directly tested in NCCER Construction Technology and expected by employers on any commercial jobsite.

What Is Light-Gauge Steel Framing?

For non-load-bearing partitions, the two main components are track (the horizontal channel fastened to floor and ceiling) and studs (the vertical members that slip inside the track). Track looks like a U-channel with no lips; studs have a web, two flanges, and small return lips that add rigidity. In this lab you will use 3-5/8-inch, 25-gauge material — the gauge number refers to the sheet-steel thickness, with higher numbers meaning thinner steel. 25-gauge is common for interior non-structural partitions.

Layout

Accurate layout is the foundation of a plumb, straight wall. Snap a chalk line on the floor for the face of the wall. Use a plumb bob or laser level to transfer the line to the ceiling directly above. Both lines must be perfectly plumb to each other; if they are not, no amount of adjusting individual studs will fix the problem. Cut the floor and ceiling track to length with aviation snips or a chop saw fitted with a metal-cutting blade (carbide-tipped or abrasive). Mark door-opening locations on the floor track before fastening; you will cut the floor track out of the opening area but leave the ceiling track continuous.

Fastening Track to Structure

Floor track is fastened to concrete slabs with concrete screws (such as Tapcon-style anchors) or powder-actuated fasteners (PAF), following the manufacturer's specified spacing. Ceiling track is fastened to the deck or framing above. Drill or punch anchor holes in the track flanges before driving fasteners. Do not fasten within 12 inches of a track splice; overlap splices at least 6 inches.

Stud Installation at 16-Inch On-Center Spacing

Measure and mark stud locations at 16 inches on center along both floor and ceiling track. Cut studs to a length that allows them to slip freely inside the track — typically 3/8 inch to 1/2 inch shorter than the floor-to-ceiling height; this clearance is intentional, not an error. Slide each stud into both tracks, orient the open side (the web opening) consistently in one direction, and twist the stud 90° before releasing so the flanges seat against the track flanges. Attach each stud flange to the track with a No. 8 wafer-head self-drilling screw or a crimping tool at each flange — that is two fasteners per end, four per stud.

Door Rough Opening

A door rough opening requires king studs on each side of the opening, running full height from floor track to ceiling track. A header spans between the king studs above the door. For a non-load-bearing partition, the header is typically a piece of track cut and notched to fit between the king studs, or a clip-angle assembly — it carries no structural load but provides a nailing/screwing surface for the door frame. Install a cripple stud between the header and the ceiling track at 16-inch on-center spacing if the header is not at the ceiling.

The Deflection Head Detail — Critical Concept

In multi-story buildings, floors deflect (move downward) under live load. If the ceiling track is rigidly fastened and cannot move, the wall will be crushed or buckled when the floor above deflects. The solution is a slotted deflection track (also called a slip track) at the ceiling. The slots in the track flanges allow the studs to slide up and down inside the track, absorbing floor-to-floor movement without transferring load into the partition.

The most common installation error is screwing through the slot and into the stud. If a screw pins the stud to the slotted track, the deflection feature is completely defeated and the wall can be damaged under load. The correct method, per Steel Framing Industry Association (SFIA) guidelines, is to fasten the slotted track to the structure above through the track web, and then fasten the stud to the track only at the floor-track end. The top of the stud floats inside the slotted ceiling track with no fastener pinning it in place.

Plumb Tolerance

The pass/fail standard for this lab is all studs plumb within 1/8 inch over the full stud height. Check plumb with a 4-foot or 6-foot level held against the stud flange. A stud out of plumb transfers misalignment to the drywall surface, creating a wavy, unacceptable finish.

Safety Rules for This Lab

• Safety glasses are mandatory at all times — cut steel produces sharp chips and burrs.
• Cut-resistant gloves must be worn when handling cut steel; edges are razor-sharp.
• Hearing protection is required when operating the chop saw.
• When using a powder-actuated fastener tool, only a licensed or trained operator may fire the tool; treat it like a firearm — keep the muzzle pointed at the work surface and never override the contact safety.
• Keep hands clear of the chop saw blade; use clamps or vise jaws, not your hand, to hold short pieces.
• Lock-out/tag-out is not applicable here, but always unplug or disable corded tools before changing blades.
• Dispose of steel scrap in a designated metal bin — loose pieces on the floor are a cut and trip hazard.

Completing the Lab

When your wall is assembled, the instructor will check three studs for plumb with a level and verify the deflection head detail. Record your measurements and observations in your lab log before the end of class.