About 55 percent of Devon's homes predate 1991, and in the older part of that stock the foundation is frequently concrete block rather than poured concrete. That single fact changes basement spray foam insulation in Devon more than the climate does, because a block wall is not a solid wall. It is a stack of hollow units with mortar joints, and both the joints and the cores conduct air.
A block wall is a network of air channels
Poured concrete leaks at cracks and at penetrations. Block leaks everywhere, through head and bed joints that were never meant to be airtight and through vertical cores that run uninterrupted from the footing up to the top course. Those cores behave like small chimneys: air warmed at the top of the wall rises, drawing cold soil-temperature air in behind it. You feel it as a cold draught at the floor on a wall that looks perfectly sound.
Any insulation that merely sits in front of such a wall leaves that circuit running. A continuous adhered layer interrupts it, which is why closed-cell foam applied straight to the block face is the method here and not just one option among several.
The assembly to avoid, and it is everywhere
A stud wall framed off the block, batt between the studs, poly stapled over the front. It was standard practice and it looks right. In a Devon winter, where frost sets into the ground and stays for months without a chinook to interrupt it, warm household air finds its way past that poly, reaches the cold block behind, and gives up its moisture there — out of sight, with no drying path. Musty air in spring and a dark stripe at the bottom of the drywall are the symptoms.
Slab floors poured on grade
The other feature of the older Devon basements is a floor slab poured directly on the ground with no insulation beneath it and often no sheet under it either. You cannot retrofit under a slab without breaking it, so the realistic moves are a perimeter detail where the slab meets the wall, a sub-floor system above it if the space is being finished, and honesty that the floor will stay cooler than the walls.
The valley-side lots are a different wall
Devon sits on the plateau above the North Saskatchewan, and lots that step down toward the valley produce walkouts and daylight basements. A basement with a full wall of door and window above grade is not a buried basement; much more of it sits in outdoor air rather than against soil, the frost line crosses it in a different place, and it needs more thickness on the exposed portion than a buried wall of the same height would.
Water before foam, every time
Foam is not waterproofing and will not hold back a seepage problem. Grading, downspout discharge and weeping tile come first. If water is entering, that is the job before this one, and we will say so rather than spray over it.
Who quotes it and who sprays it
Basement spray foam insulation Devon is quoted, scheduled and sprayed by us. Our own installers are on the job, and the number you are given is the number we stand behind.
Basement Spray Foam Insulation Devon: Common Questions
Why does a block foundation need a different approach? Because air moves through the mortar joints and up the hollow cores. Insulation held in front of the wall leaves that path open; an adhered layer closes it.
The basement was finished years ago. Does it come out? Sometimes. If there is batt and poly against block it is often doing quiet damage, and the right scope is to open it. Sometimes the room is sound and the band joist plus the unfinished areas is the honest scope.
Can anything be done about the cold floor? Not under the existing slab without removing it. A perimeter detail and a sub-floor above it are the practical answers, and the floor will still run cooler than the walls.
How much does basement spray foam insulation cost in Devon? Priced per board foot over the sprayed area, so the perimeter and the target thickness drive it. On an older Devon house the real variable is whether an existing finished wall has to come off first.
Who does basement spray foam insulation in Devon? We do, and we look at the block before quoting. The condition of the joints and whether the wall has ever been repaired changes the specification.
Size the assembly with the R-value calculator, then get a free Devon quote. More on Basement Spray Foam Insulation Alberta.