Metal Stud Wall: Sizes, Cost, Strength & Fire Ratings

A metal stud wall frames most commercial interior partitions: galvanized, cold-formed steel studs and tracks that crews cover with board. It resists fire and holds its shape for years, and it ships in consistent sizes that speed large jobs. Steel costs more up front than wood, and the two frames diverge most at plan review and on demolition day.

At STARC Systems, we build reusable temporary walls for occupied commercial renovations, and our customers often weigh us against stud framing. For a partition you’ll tear out in a few phases, a reusable wall often beats building and scrapping either frame.

What Is a Metal Stud Wall?

A metal stud wall is a partition frame of galvanized, cold-formed steel studs and tracks that crews cover with board. Studs run vertically, and tracks run horizontally along the floor and ceiling, with each stud seated inside the track.

Metal Stud Sizes and Gauges

Metal studs come in a handful of standard web widths: 1-5/8, 2-1/2, 3-5/8, 4, and 6 inches.

The 3-5/8 inch stud is the most common for interior partitions because its depth lines up with a traditional 2x4 wall. A 362S125 stud, for example, has a 3-5/8 inch web (362) and a 1-1/4 inch flange (125), and it seats in track that runs slightly wider than the web.

Gauge runs backward, so thicker steel carries the lower number. A 25-gauge stud measures 18 mil and suits most non-rated partitions; a 20-gauge stud measures 33 mil and stiffens taller or fixture-heavy walls. Door jambs usually step up to 18 or 16 gauge for the added load.

ASTM C645 covers nonstructural studs, with a minimum base steel thickness of 17.9 mil and a cap around 200 pounds of axial load. Once a member carries more than that, it crosses into structural framing under ASTM C955, where heavier gauges (18, 16, 14) take over.

How a Metal Stud Wall Goes Up

Crews fasten the floor track first, then plumb the ceiling track directly above it, and drop studs into both tracks at 16 or 24 inches on center. Studs seat inside the track rather than butting against it, which keeps the wall straight.

Fasteners replace nails. Self-tapping screws hold the assembly together, sized to the steel: #8 for 25-gauge studs, #10 for 20-gauge, run at a low torque setting so the screw bites without stripping the hole. Aviation snips handle 25-gauge cuts; thicker studs call for a chop saw.

Slotted deflection track lets the structure move independently of the wall, so the partition doesn’t crack when the floor above deflects. Mid-height bridging controls stud roll on tall walls and wider 24-inch spacing, and wood blocking goes in behind cabinets, grab bars, and equipment.

Where the space needs to stay quiet, resilient channel decouples the board from the framing to cut sound transfer.

How a Metal Stud Wall Compares With Wood

A wood stud wall builds the same kind of partition from dimensional lumber studs and horizontal plates, nailed or screwed together and finished with board. It’s the other default for interior framing, which is why steel and wood get weighed against each other: factors like building type, cost, and how long the wall has to stand decide it.

Each has a clear lean. Wood takes a fastener anywhere along the stud, so field changes are easy, and it insulates better than bare steel. Steel stays straight and resists fire, and it won’t rot, warp, or draw insects the way lumber can.

Here’s how they compare on the factors that usually settle it.

Fire Rating and Building Type

Fire performance is where steel and wood separate most, and the building code often settles which material you can use.

Steel is noncombustible as manufactured, so it qualifies for the noncombustible construction that IBC Section 602 requires in Type I and II buildings.

Wood is combustible: it’s allowed throughout Types III through V, but in Type I and II construction it’s limited to specific uses like non-bearing partitions, and only as fire-retardant-treated lumber.

A fire rating belongs to the whole wall assembly rather than the stud alone. The hour comes from the gypsum: layers of 5/8-inch Type X board resist the fire, and the framing holds them in place.

UL design V449, for example, turns a one-hour wall into a two-hour wall by adding two layers of 5/8-inch Type X board to one side. Noncombustible steel describes the material; a one-hour or two-hour rating describes the tested assembly it sits in.

Cost

On raw material, lumber usually starts cheaper per piece, but it’s the volatile one: a 2x4 stud runs around $4 to $5 today and can climb toward $8 when the lumber market spikes.

A 3-5/8 inch interior steel stud is steadier, around $0.39 to $0.45 per linear foot in 20 to 25 gauge, or roughly $10 to $16 for an 8- to 10-foot stud at retail.

Steel’s uniform quality also leaves fewer culled pieces and less scrap, which narrows the difference on commercial jobs, and when lumber spikes, steel can come in as the more competitive bid.

Installed, the two land close. Interior partition framing runs about $4 to $9.50 per square foot for straightforward layouts once labor, track, and fasteners are counted. Steel prices move, so treat these as a current-market starting point.

A temporary partition changes the picture. Framing opens a build-and-demolition cycle that repeats every phase, and each repeat piles on labor and disposal charges on top of the material.

Strength

In a non-load-bearing partition, the structure above carries the building, so strength comes down to stiffness at height. Steel stiffness follows gauge, and lumber stiffness follows grade and stud spacing.

Engineers check interior partitions against a lateral load of 5 psf for most walls and 7.5 to 10 psf for shafts and stairwells, with deflection limits from L/120 to L/360.

A 25-gauge, 3-5/8 inch stud at 16 inches on center suits walls to about 10 feet. A 20-gauge stud reaches 13 to 16 feet, and an 8 inch 14-gauge stud frames up to 40 feet. Manufacturer load tables set the exact limits.

Installation

Steel arrives in consistent, ready-to-install sizes, which speeds large jobs. Lumber often needs on-site cutting and adjustment, though wood stays quicker on short runs.

The bigger difference is labor familiarity. Most crews have run more wood than steel, and steel swaps nails and a saw for screws and metal-cutting tools, so a team new to it works slower and labor can cost more.

Metal pulls ahead on utilities: pre-punched knockouts in the stud webs let crews run wiring and plumbing straight through, while wood has to be drilled. Steel is also lighter to carry and stack, which helps on big multi-floor jobs.

When a Reusable Temporary Wall Beats Framing

On occupied, phased work, there’s a third option that often beats either frame: a reusable panel wall that goes up in place of studs and comes back for the next phase instead of heading to a dumpster.

The economics turn on reuse. A framed partition gets built and demolished every phase, with labor and disposal each time, while a reusable wall is a one-time buy that pays for itself in two to four uses.

On a healthcare job, W.E. Bowman ran 5,200 feet of STARC containment across seven phases and saved 75% versus drywall by reusing the same panels.

It wins on code and containment too. Where a renovation needs infection control, STARC panels exceed ICRA Class IV/V and seal airtight for negative-air zones, which drywall can’t deliver without being built, taped, and torn down.

Where a phase needs a rated assembly, FireblockWall™ is a one-hour fire-rated wall tested to ASTM E119 that installs about four times faster than drywall.

And it covers the jobs that framing handles awkwardly. RealWall™ installs at 100 feet per hour and cuts noise by up to 50% for long-term, high-visibility spaces; LiteBarrier™ is light enough to move between phases, with extensions to 13 feet, or up to 19 feet for hot-aisle containment.

StackBarrier™ reaches tall, open spans up to 40 feet. On a 270,000-square-foot data center build, the team swapped planned metal studs and fire-rated plywood for StackBarrier across 12 phases and cut labor.

None of this beats a stick-built wall that goes up once and stays. For a one-off partition that comes down tomorrow, where appearance and inspection aren’t in play, basic framing or poly is the cheaper call.

Reusable is the better buy when the work is occupied, phased, or repeats across a building.

Metal, Wood, or Reusable: Which Wall Type Fits

Most choices come down to two questions: how long will the wall stand, and what will the inspector require?

Pick a metal stud wall when the partition stays for years or climbs past 10 feet. Modular systems cover long-term offices and patient care areas too.

Pick wood when the building type allows it and the job is small, since crews can fasten straight into the stud.

Choose a reusable panel wall when the building stays open and the work moves in phases. We'd also reach for panels on any barrier that needs ICRA Class IV/V containment or a one-hour rating.

Not sure which system fits? The Wall Wizard narrows it down by wall height and fire rating in a couple of clicks. Then request a quote and we’ll match your project to the right system and send a tailored estimate.

Frequently Asked Questions

Is a metal stud wall stronger than a wood stud wall?

Yes, in stiffness and stability, since a metal stud wall holds its dimensions while a wood stud wall bows and warps as it dries. A 25-gauge, 3-5/8 inch stud reaches about 10 feet, and a 20-gauge stud reaches 13 to 16 feet.

What drives metal stud wall cost?

Metal stud wall cost follows gauge and stud spacing, which set how much steel a wall uses. Sixteen-inch spacing is common, and fire-rating requirements add cost.

What size metal stud is standard for interior walls?

The 3-5/8 inch stud is the standard size for most interior partitions, and its depth closely matches a traditional 2x4 wall.

Can a metal stud wall carry a fire rating?

Yes, a metal stud wall can earn a fire rating. UL design V449 converts a 1-hour wall into a 2-hour wall by adding two layers of 5/8 inch Type X board to one side.

What is the difference between a metal stud wall and a demising wall?

The difference is that a metal stud wall names the framing method, and a demising wall names the job of marking a permanent tenant boundary.

Is a metal stud wall cheaper than wood?

A metal stud wall usually costs more than a wood stud wall, though light-gauge steel is priced close to lumber. Heavy gauges widen the difference, and interior partitions use the lighter gauges.

What are the disadvantages of metal studs?

The disadvantages of metal studs include heat transfer and flex at thin gauges. Steel carries heat through the wall cavity, and light-gauge studs bend under heavy fixtures until crews add wood blocking.