Spray Foam vs Fiberglass Insulation in Toronto Climate: What’s Better?

Let’s compare.

1️⃣ Air Sealing

Spray Foam: Expands and seals air gapsFiberglass: Does not stop air movement

In Toronto winters, air leakage is the #1 cause of heat loss.

Winner: Spray Foam

2️⃣ Moisture Resistance

Closed cell spray foam:

• Acts as vapor barrier

• Prevents condensation

• Reduces mold risk

Fiberglass:

• Absorbs moisture

• Can grow mold

• Loses R-value when wet

Winner: Spray Foam

3️⃣ R-Value Per Inch

Closed Cell Spray Foam: ~R6 per inchFiberglass Batt: ~R3–R3.5 per inch

For basement walls and rim joists in Toronto homes, higher R-value per inch is critical.

Winner: Spray Foam

4️⃣ Cost Comparison

Fiberglass is cheaper upfront.

Spray foam costs more initially but:

• Lowers heating bills

• Prevents moisture damage

• Reduces future repairs

Many Toronto homeowners regret choosing the cheaper option.

Final Verdict for Toronto Homes

For:

• Basements

• Crawl spaces

• Garage ceilings

• Unvented roofs

Spray foam insulation is the superior long-term solution.