Crawl space spray foam insulation in Carstairs matters more than it does in a town where somebody is home during the day, because a crawl space under an empty house is a space with nobody to notice what is happening in it.
Nobody is home when it gets cold enough to matter
The coldest hours of a working day fall between mid morning and mid afternoon, which is exactly when a commuter house in this town is empty and set back. Anything in the crawl space is exposed to those hours without anybody nearby. That is the honest reason this space deserves attention here: not comfort, but the fact that a problem developing under the floor has ten hours a day to develop unobserved and nobody arrives until the evening.
What is running through it decides the urgency
Most crawl spaces here carry water lines, drains and heating ducts, and those are the reason the space cannot simply be left cold. A pipe in an unheated crawl under a house that is set back all day is in a different situation from the same pipe under a house held at temperature. Where the services run through the crawl, bringing the space inside the heated envelope is the approach that protects them, and it is more reliable than any arrangement that depends on the heating being left on.
A space with no heat of its own, under a house that is set back
A crawl space has no heat source. Everything it has is leakage from the floor above, which means its temperature is entirely inherited. That is ordinarily fine and it is why these spaces survive in most towns. It stops being fine in a house that is set back for ten hours a day. When the thermostat drops, the rooms recover in the evening because they are being heated directly; the crawl does not, because the only thing warming it was the house being warm. Over a cold week it trends down while the house above it appears to be coping. That is the argument against insulating between the floor joists here: doing so cuts the crawl off from the one source of heat it has, and puts the pipes on the wrong side of the insulation in a building nobody is standing in when it matters.
Ground cover first, then the perimeter, then the covering
Where there is bare earth under the house, a sealed ground cover comes before anything else, because insulating over open soil traps moisture in the timber above. After that the perimeter wall and the rim. Foam left accessible in a Carstairs crawl space that a person can enter needs a thermal barrier or the ignition barrier the space calls for, so that gets priced at the start rather than raised afterwards. More on thermal barrier vs ignition barrier.
Crawl Space Spray Foam Insulation Carstairs: Common Questions
Does setting the heat back while we are out cause it? Then anything in the crawl space spends the coldest hours unattended. That is the risk.
Should the vents be closed? The approach that works seals the crawl and brings it inside the envelope.
What comes first? A ground cover where there is bare soil. Insulating over open earth makes things worse.
Size the assembly with the R-value calculator, then get a free Carstairs quote. More on Crawl Space Spray Foam Insulation Alberta.