About 31 percent of Spruce Grove homes were built before 1991, an even split between older stock and newer subdivisions. Wall spray foam insulation in Spruce Grove is worth timing rather than scheduling, and the moment worth waiting for is a re-side. It is the only occasion on a finished house when the wall assembly can be genuinely improved without anybody living in a construction site.
Why exterior work is different in kind
Insulation applied outside the studs is continuous. It runs past the framing rather than between it, which is the only way to interrupt thermal bridging, because there is then no path conducting straight through a stud from inside to outside. Cavity insulation, however good, always leaves that path. That is why an exterior layer punches above its thickness, and why the same money often does more from outside than it would from inside.
The details that decide whether it works
This is where exterior work is either done properly or done cheaply. The cladding needs something to fasten to, so strapping goes over the insulation and the fasteners have to reach real structure. The windows and doors end up recessed relative to the new cladding line, so the openings need extended jambs and the flashing above them has to be reworked to shed water over the thicker wall rather than behind it. Trim, corners and the roof edge all move outward with the wall. None of that is difficult, but all of it has to be planned before the old cladding comes off, and a quote that does not mention it has not been thought through.
Where the water has to go
A wall built outward has to keep draining and drying. The layers have to run in an order that lets water that gets past the cladding get back out, which is the whole reason strapping creates a gap behind the cladding in the first place. Insulation that traps water against sheathing is worse than the wall it replaced. This is the part of the job to ask questions about, since it is invisible the moment the siding goes on.
Where an R-20 wall gives its R back
A batt marked R-20 delivers close to that through the batt and considerably less through the studs, plates and headers beside it, because wood conducts heat several times more readily than insulation. Framing is roughly a fifth of a wall. Add the air leakage a house of this age has accumulated and the assembly performs under its label, which is the gap an exterior layer closes most directly.
If the siding is not coming off
Then the walls are not this year's job, and the honest recommendation is the attic, the rim joist and the crawl space. They are accessible today, generally leak more air than the walls do, and cost less to correct. Foam bonds to what it is sprayed onto, so a finished wall cannot be sprayed from the inside either, and there is no version of this work that avoids opening something.
Wall Spray Foam Insulation Spruce Grove: Common Questions
We are re-siding next year - should we insulate at the same time? That is the moment. It is the only time the wall can be upgraded continuously without disturbing the inside of the house.
Will the windows still look right? They need extended jambs and reworked flashing because the cladding line moves out. Planned in advance it looks deliberate, added later it looks like an afterthought.
Is exterior insulation better than filling the cavity? It is the only method that interrupts thermal bridging, so per inch it does more. Which is right depends on what is being opened.
Estimate board feet, then get a free Spruce Grove quote. More on Wall Spray Foam Insulation Alberta province-wide.