Wall spray foam insulation in Westlock is the job with the best story and the worst timing. With about 80% of local homes built before 1991, most walls in this town are 2x4 framing with whatever batt was standard when they went up, no sheathing membrane worth the name, and air moving freely at the plates. Everyone can see that is the weak point. The difficulty is that a wall is the most expensive surface in a house to get at.
What is behind the siding on this stock
Opened up, an older wall here is usually the same story. Batt that has settled or been compressed around wiring, so the top few inches of each cavity is empty. No continuous air barrier, because the practice of the day was building paper lapped rather than sealed. Gaps at the bottom plate and at the top plate where the cavity opens into the floor system or the attic. And a stud every sixteen inches conducting straight through, which on a 2x4 wall is a significant fraction of the area. The result is a wall whose real performance is well below what its nominal insulation suggests.
Why the moment matters more than the method
Opening a sound wall to insulate it alone almost never competes with the rim joist or the attic on the same house. But a wall that is already open is a completely different proposition, and that happens for reasons other than insulation: re-siding, replacing windows, repairing water damage, or a gut renovation of a room. When the wall is open anyway, the incremental cost of spraying the cavity is small and the opportunity does not come round again for decades. If you are planning any of those jobs on an older Westlock house, that is the conversation to have before the trades arrive, not after.
From inside, from outside, or exterior continuous
Three routes. From the inside, taking off the finish, spraying the cavity and reboarding, which suits a room being renovated anyway. From the outside, removing the siding and the sheathing to expose the cavity, which is the re-siding case. Or continuous exterior insulation over the sheathing when the siding comes off, which is the only approach that addresses the studs bridging through and is worth asking about while the wall is accessible.
Vapour control in a climate with no mid-winter thaw
A 2x4 cavity sprayed full of closed-cell is its own vapour retarder and does not want an added poly layer over it, because a second retarder on the warm side of foam creates a cavity that cannot dry in either direction. North of Edmonton the drying question is sharper than it is further south, because there is no thaw in the middle of the season to give the assembly a recovery window. Getting the layer order right is not a formality on this stock; it is the difference between a wall that works and one that holds water for the whole winter.
Who does the work
For wall spray foam insulation Westlock, we quote and manage the whole job and our own installers do the work. The free quote comes from the people who will be on site.
Wall Spray Foam Insulation Westlock: Common Questions
Is it worth opening the walls just to insulate them? Usually not. The rim joist and the attic give more for the same spend. Walls make sense when they are open for another reason.
Can foam be injected without opening the wall? Injected products exist and are a different trade from sprayed foam. We would rather tell you that plainly than pretend a blind fill in a cavity with settled batt in it is the same job.
We are re-siding next summer. That is the moment. Ask about the cavity and about continuous exterior insulation over the sheathing while the wall is open.
Do we still need a poly vapour barrier over the foam? Not over full-depth closed-cell, which is its own vapour retarder. Two retarders with a cavity between them is the assembly to avoid.
How much does wall spray foam insulation cost in Westlock? The foam prices per board foot of cavity area at the depth available, and on a wall the surrounding work, meaning removal, sheathing and refinishing, is usually larger than the foam item. That is why timing it with other work matters.
How do I choose a wall spray foam contractor in Westlock? Ask what they would put over the foam and why. The layer order on a wall in this climate is the part that has to be right.
Size the assembly with the R-value calculator, then get a free Westlock quote. More on Wall Spray Foam Insulation Alberta province-wide.