Nothing tests a house like Lethbridge wind. The city's famous chinook gales find every unsealed seam, and a home that would be comfortable in a calm climate feels drafty here the moment the wind picks up. Spray foam is the answer because it air-seals as it insulates - it stops the infiltration, not just the conduction.
Where Lethbridge homes lose heat
- Walls - wind-driven infiltration through the gaps batt leaves around studs and outlets is the signature Lethbridge problem; closed-cell on exterior walls shuts it down.
- Rim joists and basements - the leaky band and cold below-grade walls of the older 59%-pre-1991 stock.
- Additions and character homes in the established core that never sealed against the wind.
Why the air-seal wins here
R-value slows heat; only an air-seal stops wind-driven cold. In the windiest city in the country, that distinction is the difference between a home that's comfortable in a gale and one that isn't. Newer communities like Copperwood and Garry Station benefit too, at the bonus rooms and rooflines.
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