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Basement Framing: Walls, Materials & Code for Calgary Homes

Basement Renovations

Framing Is the Skeleton of Your Basement

Get the framing right and everything else goes smoothly. Get it wrong and you’re fighting plumbing, electrical, and drywall problems for the rest of the project.

Wood vs Steel Studs

Factor Wood (2×4) Steel Stud
Cost Lower Higher (10-20%)
Moisture resistance Can rot, mould Won’t rot
Workability Easy (nail, cut) Requires tin snips, screw gun
Sound transmission Moderate Better (decoupled)
Straightness Can bow/warp Stays true
Hanging heavy items Easy Needs special anchors

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⚠ Estimate Disclaimer: These are only ROUGH estimates that can vary wildly. Do not take these numbers as gospel. Having a defined scope of work and exact selections will give you clarity.

Our recommendation: Wood 2×4 is fine for most Calgary basements. Use steel only if moisture has been a persistent issue or for acoustic applications.

Framing at Exterior Walls

Exterior basement walls must leave a gap between the concrete and the framing. Do NOT frame tight to the concrete wall — this traps moisture and causes mould.

  • Leave 1″ air gap (or fill with rigid foam board)
  • Pressure-treated bottom plate (or plastic plate protector on concrete)
  • Insulation goes in the stud cavity
  • Vapour barrier on the warm side (interior face)

Wall Height for Basement Bedrooms

Alberta code requires minimum 6’11” finished ceiling height in habitable rooms (bedrooms, living rooms, kitchen). Measure from rough slab to underside of joists, subtract for subfloor (if any), ceiling drywall, and any soffits. Tight in older Calgary bungalows — measure before you commit.

Standard Framing Specs

  • Stud spacing: 16″ on centre (standard) or 24″ OC (acceptable for non-load bearing)
  • Plate: single top plate + double top plate for load-bearing, single for partition walls
  • Headers over doors: double 2×8 or LVL per span table
  • Bottom plate: pressure treated for contact with concrete

Fire Code: Fire-Separation (Legal Suites)

If you’re framing a legal secondary suite, the wall/ceiling between the suite and the main home must achieve fire separation per Alberta Building Code:

  • Minimum: 30-minute fire resistance assembly
  • Common approach: 5/8″ Type X drywall on ceiling of suite (one layer each side)
  • All penetrations sealed with fire-rated caulk
  • Self-closing, fire-rated door at any connecting entrance

Soffits: Planning Mechanical Around Framing

Your HVAC ducts and plumbing drain lines typically run below the joists. Plan soffits to hide them cleanly. Build soffits after rough mechanicals are inspected — not before. Nothing worse than building a soffit and then having the inspector require a duct to move.

Related Articles

Pillar Guide: Basement Renovations Calgary: The Complete Guide

Contact Olympic City Renovations for a free consultation.

Olympic City Renovations serves Calgary, Priddis, Okotoks, and surrounding communities.