Wall spray foam insulation in Fort McMurray answers to a colder design temperature than anywhere else we work in Alberta, and cold that deep changes which details actually matter. A wall assembly that performs acceptably in a southern Alberta town gives up a noticeable share of its rated performance here, because the further apart the inside and outside temperatures sit, the more heat every weak path in the wall carries away.
Why the studs matter more this far north
A wall described as R-20 does not deliver R-20. It delivers close to that through the insulated cavity and considerably less through every stud, plate and header, because wood conducts heat several times more readily than insulation does. Framing is roughly a fifth of the area of a typical wall. That penalty is proportional, so it grows in real terms as the temperature difference grows. This is exactly why exterior continuous insulation, the only approach that interrupts thermal bridging rather than working around it, makes a stronger case in Fort McMurray than it does in a milder part of the province.
Two housing stocks, two completely different jobs
The neighbourhoods rebuilt after the 2016 wildfire are new assemblies, and on a new build the wall question is settled cheaply at framing while the cavity is open and nothing has to be removed. The older stock from the earlier growth waves is the opposite situation: those walls are finished, and getting foam into them depends entirely on something else opening them up. Quoting one of those as though it were the other is how people end up disappointed, so the first thing we establish is which of the two we are standing in.
Access is not a preference, it is the constraint
Spray foam bonds to the surface it is sprayed onto, so the stud cavity must be open before anything can be applied. A finished wall cannot be sprayed, whatever anyone tells you. In practice that ties retrofit wall work to renovations, re-sides and walls already opened for other reasons. Saying so early saves a lot of wasted quoting on both sides.
Houses that sit empty on rotation
A great many homes here are empty for a week or two at a time while somebody works a rotation. Insulation does not heat a house and we will not pretend otherwise, but a wall that is sealed as well as filled loses temperature more slowly and holds a more even temperature between rooms, which matters in a building nobody is watching. Air leakage also carries interior moisture into the assembly, and moisture inside a wall in this climate is the failure that shows up years later rather than immediately.
Where an empty budget should go first
If no wall is being opened, the money belongs somewhere else. The attic, the rim joist and the crawl space are reachable today, generally leak more air than the walls do, and cost less to correct. A wall quote that ignores the attic above it is an invoice, not advice, and we would rather send you upstairs first and do the walls when a renovation makes it sensible.
Wall Spray Foam Insulation Fort McMurray: Common Questions
Is foam worth it in a house this far north? The colder the location, the more the sealing and the thermal bridging matter, so the case is stronger here than it is in the south. On an open wall, yes.
Can you spray my walls without opening them? No. Foam bonds to the substrate, so the cavity has to be open. Anyone promising otherwise is describing a different product.
We are rebuilding - when do we decide? At framing. That is the one moment the assembly costs almost nothing extra to get right, and it does not come back.
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