A Calgary house has a specific set of cold spots, and they cluster by era. The inner-city and established quadrants - much of the pre-1991 stock that makes up about half the city - leak at the rim joists, the basement walls and the additions tacked on over the decades. The newer NW communities like Evanston and Sage Hill leak in different places: bonus rooms over garages and the complex rooflines builders love. Spray foam fixes both because it seals air and insulates in one pass.
Where Calgary homes lose heat
- Basements - closed-cell shuts down the condensation that ruins a framed-out Calgary basement, and adds real R against the frost line.
- Rim joists - the leakiest band in almost every Calgary home, and the fastest win.
- Bonus rooms over garages - the cold room in half the newer NW builds; foaming the floor and knee walls fixes it.
- Attics & additions - where chinook freeze-thaw does its damage (see attic spray foam in Calgary).
Why the air-seal matters more here
Calgary doesn't get a steady cold - it gets chinook swings that pump air in and out of every gap. Batt insulation can carry a good R-number and still let that wind through the seams around it. Spray foam's air-seal is what actually stops the draft you feel in an older Calgary living room in January.
The right foam, room by room
Closed-cell below grade and at the rim joist; open-cell where sound and budget lead on interior walls. A good Calgary installer specs the mix instead of defaulting to the priciest option. Estimate your job, then get a free Calgary quote. See what it costs in Calgary.