Spray Foam Insulation in Blackfalds, AB.

71.8% single-detached against 10.2% pre-1980 is an unusual pairing: a nearly-all-detached town with almost no old detached houses in it. In practical terms the town is subdivisions, and subdivisions fail by cohort rather than by age.

A run of homes put up in the same three years by the same builder shares whatever the builder's standard detail was — the same rim-joist treatment, the same attic-hatch detail, the same approach to the ceiling over an attached garage. When one house on a street has a cold bonus room, its neighbours frequently do too, and the fix is the same fix. That is a very different diagnostic problem from a town of century-old one-offs.

Blackfalds is close enough to Red Deer that the climate figure is close to a technicality — but it is still borrowed. The reading comes from RED DEER REGIONAL A (climate ID 3025480), about 13 km south: 5,619 heating degree days at an 18 °C base, a January daily minimum averaging -17.6 °C, and -43.8 °C at the extreme. There is no Blackfalds station.