You’re looking at a wall and thinking it’s just drywall. But behind it sits a drywall steel stud system doing all the work. If you’re renting or planning a fit-out, knowing what’s inside those walls helps you avoid noise issues, weak partitions, or future repair headaches.
What Is a Drywall Steel Stud?
- Non-combustible, which improves fire safety inside units
- Resists mould and moisture better than wood
- Keeps its shape, so walls stay straight over time
- Supports drywall panels, insulation, and basic fixtures
Breaking Down the Profile: Why Shape Matters
Drywall studs come in two main profiles: C-shaped and U-shaped.
- C-stud: Flanges curve inward toward each other
- U-stud (track): Flanges point outward and act as the base or top channel
The standard design includes:
- A flat center section called the web
- Two side flanges for fastening drywall
- A slight curve in the web to stop studs from locking together during stacking
Most studs are made from galvanized steel with a zinc coating that helps protect against corrosion. That coating usually comes in G40 or equivalent, which offers consistent durability in indoor environments.
What “EQ20” Means in Thickness and Gauge
You’ll see something like “EQ20 gauge” listed. That refers to the thickness and strength of the metal. Here’s how it breaks down:
- 23 mil thickness with 50 KSI strength
- 18 mil thickness with 70 KSI strength
Both fall under the same equivalent category. The difference comes down to how strength is achieved: either thicker metal or stronger material. For most interior partitions:
- Lighter gauges are used for standard walls
- Heavier gauges are used when walls need to go taller or stay more rigid
Drywall Stud Heights: Standard Sizes You’ll See in Interior Walls
If you’ve ever knocked on a wall and noticed it sounded hollow or solid, size plays a big role. Common drywall stud sizes include:
| 1-5/8″ | Used for shallow partitions or furring |
| 2-1/2″ | limited use, often for tight spaces |
| 3-5/8″ | The most common for standard interior walls |
| 6″ | used where plumbing or thicker insulation is needed |
The 3-5/8″ option works well in most rental units. It leaves enough room for wiring and basic soundproofing without taking up too much floor space. Bathrooms usually shift to 6″ studs. That extra depth allows pipes to fit without cutting into drywall or weakening the structure.
How Tall Can Drywall Stud Walls Go?
Here’s where things get technical and important if you’re dealing with high ceilings or large spaces. Even though these studs don’t carry structural loads, they’ve been tested to determine how tall a wall can go without bending too much.
The typical setup includes 5/8″ drywall on both sides, an estimated load of about 5 pounds per square foot, and a deflection limit set at L/240. Values are based on North American steel design standards (AISI S100), as referenced in the 2009, 2012, and 2015 International Building Code.
For example, a common 362S125-18 (70 KSI) stud can reach about 16′8.” Standards like ASTM C645 limit the wall’s lateral load to 10 lb/sf. That means the total weight of the drywall or any panels attached should stay within that limit. For taller partitions, size and spacing change.
Sample Height Ranges
For standard interior partitions:
- 3-5/8″ studs (18 gauge): up to ~19′ at tighter spacing
- 6″ studs (16 gauge): up to ~30′
- 8″ studs (14 gauge): over 40′
For very tall walls (40′+), builders adjust:
- Heavier gauge studs (14, 12, or 10 gauge)
- Closer spacing (12″ or 16″ on centre)
- Wider web sizes
This is common in large commercial spaces like gyms or event halls, though occupants usually encounter lower partitions.
What Affects Wall Height in Real Projects?
It’s not just the stud size. A few other factors come into play:
- Stud spacing: Closer spacing increases strength
- Drywall type: Heavier finishes add more load
- Deflection limits: Stricter limits require stronger framing
- Bracing systems: Added support increases allowable height
For example:
- A 20′ wall with 6″ studs at 24″ spacing costs far less than a 40′ wall using heavier studs and tighter spacing
- Taller walls need more labour, especially when drilling thicker steel
What About Hole Punches for Utilities?
Drywall studs aren’t solid all the way through. They come with pre-punched holes to make room for:
- Electrical wiring
- Plumbing lines
- Bracing systems
Standard punch is around 1.5″ wide and includes a small tab to guide wires and prevent damage. Spacing differs by region:
- East: first punch at 12″, then 48″ on centre
- West: first punch at 24″, then 24″ on centre
This built-in layout makes it easier for trades to install services without drilling through every stud.
Knurling and Ribbing
If you look closely at a stud flange, you’ll notice texture and grooves. These features serve a purpose:
- Knurling: Small ridges that help screws grip and stay in place
- Ribbing: Grooves that reduce twisting and add slight strength
You won’t notice this once drywall is up, but it improves fastening and keeps the wall stable during installation. But for drywall installation near door and window frames, it’s crucial to check transition points to prevent common drywall cracks.
Cost of Assembly
Cost shifts a lot depending on wall height, even if the wall length stays the same.
Take a 100′ long wall at 20′ high with a 6″ depth and 5/8″ drywall on both sides. Using 18-gauge 6″ studs at 24″ spacing with bracing every 8 feet, the framing package lands around $2,500 (~$3,460.50 CAD), or about $2.5 (approx. $3.46 CAD) per square foot.
Now push that same wall to 40′ high with an 8″ depth. You’ll need heavier 14-gauge 8″ studs at tighter 16″ spacing, plus bracing every 4 feet. That setup brings the cost closer to $13,000 (approximately $17,998.50 CAD), or about $3.25 (about $4.50 CAD) per square foot.
The jump comes from heavier material, tighter spacing, and added labour, especially with thicker studs that take more effort to drill and fasten.
Deflection Limits in Drywall Steel Studs
Thicker gauge studs change how the job unfolds on site.
- Drilling into them takes more effort, especially during full drywall installation, where repeated fastening slows progress.
- Labour time goes up, and heavier members (like a 12″ 14-gauge stud at about 4 lbs per linear foot) usually need more than one person to handle safely.
Deflection limits play a role in cost as well. Standard drywall setups follow an L/240 limit, which works for most interior walls. Once you move to stricter limits, such as L/360, for finishes like cement board or plaster, the metal framing needs to be stiffer. That usually means tighter spacing or thicker studs, which adds to both material and labour costs.
Now You Know More About Drywall Steel Studs, Start Your Project Now
A drywall steel stud wall comes down to a few key details: size, spacing, and how it’s put together. Those factors shape how durable and stable your walls will be over time. If you’re planning changes or reviewing a space, getting it right early saves time and cost later. For reliable results, connect with Victoria Steel Stud Framing and get your project handled with confidence.
Frequently Asked Questions
Can I screw directly into a drywall metal stud?
You can screw into a drywall metal stud, but it takes the right approach. Standard nails won’t work, and forcing screws without guidance can strip the metal. Pre-drilling or using self-drilling screws helps. For heavier items like TVs or shelves, anchor directly into the stud or use rated anchors for better support.
Do I need special drywall screws for metal studs?
Yes, metal studs require specific screws. Self-drilling drywall screws are used for thicker gauges, such as 14 to 20, as they cut through metal without pre-drilling. For lighter studs, fine-thread sharp-point screws work well. Using the wrong type can lead to weak connections or stripped holes during installation.
Does drywall attach directly to studs?
Drywall attaches directly to metal studs, but proper steps matter. Panels are aligned, then fastened with screws at consistent spacing along each stud. Installers add adhesive for extra hold. Screw heads should sit slightly below the surface without breaking the paper to keep the finish smooth and ready for taping.
