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Basement Insulation Guide for Calgary Homes (R-Values & Methods)

Basement Renovations

Calgary Winters Make Basement Insulation Non-Negotiable

A poorly insulated basement is uncomfortable, expensive to heat, and prone to condensation and mould. Here’s how to insulate a Calgary basement properly.

Alberta Building Code Requirements

  • Basement walls: R-17 minimum effective (most zones)
  • Slab below grade: R-10 minimum (new construction)
  • Common approach: 2×4 framed wall with R-12 batt + 1″ rigid foam = R-17+

Insulation Options for Basement Walls

Option 1: Closed-Cell Spray Foam (Best)

Applied directly to the concrete wall. 2″ of closed-cell = R-13. Acts as both insulation and vapour barrier.

  • Cost: $3–$6/sq ft installed
  • Pros: Air seal + vapour barrier + insulation in one, excellent R-value, no moisture issues
  • Cons: More expensive, off-gasses during install (vacate 24 hrs)

Option 2: Rigid Foam + Framed Wall

2″ of XPS or polyiso rigid foam against the concrete wall, then frame a 2×4 wall in front with batt insulation.

  • Cost: $2–$4/sq ft installed
  • R-value: R-10 (rigid) + R-12 (batt) = R-22
  • Pros: High R-value, good moisture management if foam is sealed properly

Option 3: Batt Only in Framed Wall

2×4 or 2×6 framed wall with batt insulation, vapour barrier.

  • Cost: $1.50–$3/sq ft installed
  • R-value: R-12 to R-21
  • Risk: Condensation forms on cold concrete behind framing if vapour barrier is imperfect — can cause mould
  • Not recommended by most Calgary basement contractors

Vapour Barrier: Required in Calgary

A 6-mil polyethylene vapour barrier is required on the warm side of the insulation. In Calgary, warm side = interior (between insulation and the finished drywall). Never put vapour barrier on the cold side (between insulation and concrete) — this traps moisture.

Basement Floor Insulation

  • 2″ XPS rigid foam under the slab (new construction or full slab replacement)
  • For existing slabs: 1″ foam + sleepers + subfloor + flooring (loses headroom but adds R-value and warmth)
  • Dimpled membrane (Delta-FL) over existing slab: drainage gap, adds some warmth, minimal height loss

Air Sealing: Often Overlooked

Gaps around windows, rim joists, and penetrations are the biggest source of heat loss in Calgary basements. Spray foam these areas before closing walls.

  • Rim joist: spray foam to R-12 minimum
  • Around all penetrations (pipes, wires)
  • Window well areas

Cost Summary for a Calgary Basement

Method Approx Cost (1,000 sq ft)
Spray foam walls (2″) $4,000–$7,500
Rigid foam + batt (full walls) $3,500–$6,500
Batt only (not recommended) $2,000–$4,000
Floor foam + subfloor $2,500–$5,000

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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.

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Contact Olympic City Renovations for a free consultation.

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