About 20 percent of Okotoks homes were built before 1991, so the most common residential foam job in this town is not a repair - it is a basement being finished. Doing that once, properly, is worth more than any other decision on this page, because the wall will never be that accessible again. Residential spray foam insulation in Okotoks is most often a basement decision, and it is worth making once rather than twice.
Insulate before the studs, not after
The order matters. Foam applied directly to the concrete before framing gives a continuous, sealed layer with no thermal bridge through the studs and no gaps around the plates. Framing first and filling the cavities afterwards gives you insulation between the studs and nothing behind them, which is a materially worse assembly for the same money.
Why closed-cell below grade is not a preference
The wall you are insulating is concrete with soil on the other side. Closed-cell resists moisture rather than absorbing it, which is why it can sit against that wall for decades without becoming a problem. Open-cell, which is vapour-permeable and takes on water, cannot. Two inches gets roughly R-12 to R-14; three to four inches reaches R-18 to R-28 where the cavity allows. At about 38 mm it becomes a vapour retarder under Alberta section 9.25, which means the assembly does not need a separate polyethylene sheet - one less layer to install and one less layer to fail.
Decide now that it will be lived in
This is the detail that catches people. Foam facing occupied space needs a thermal barrier over it, normally 12.7 mm drywall or an approved intumescent coating. An unfinished utility area entered only for service can use an ignition barrier, which is cheaper. Spraying to the lighter requirement because the space is "just storage for now", then finishing it in two years, leaves an assembly that no longer complies - and correcting it means opening up what you just built.
While the basement is open, do the rim
The rim joist is right there, it is the leakiest band in the house, and the crew is already on site with the hose run. Adding it to a basement job costs a fraction of what it costs as its own visit, because mobilising a rig has a fixed cost either way.
Do the other trades before the foam
Once foam is applied to a basement wall it is not a surface anyone wants to be cutting into. Wiring, plumbing rough-in, any drain work and anything that needs to pass through the wall should be finished and inspected first. It sounds obvious and it is the most common sequencing mistake on a basement development - a plumber arriving after the spray means cutting through a continuous air barrier and patching it, which is both a cost and a weak point that did not need to exist.
Residential Spray Foam Insulation Okotoks: Common Questions
What is the most common job in Okotoks? Finishing a basement. About 20 percent of local homes predate 1991, so most work is development rather than repair.
Before or after the studs? Before. Foam straight onto the concrete gives a continuous sealed layer with no thermal bridge through the framing.
What has to happen before the spray? Wiring, plumbing rough-in and anything passing through the wall should be finished and inspected. Cutting into a cured air barrier afterwards creates a weak point that did not need to exist.
Plan it with the spray foam calculator, see what it costs, or get a free Okotoks quote.
After the foam: the interior finish
Spray foam does not get left exposed in a living space -- it has to be covered, and drywall is what does it. We work alongside boarding and taping in Okotoks, an independent drywall contractor, so the two stages are not left to collide on site.