Crawl space spray foam insulation in Stony Plain is nearly always work under an addition rather than under a whole house, because the older properties here grew outward over decades and the newer ones were dug out properly from the start.
Under the part that was added on
The pattern repeats across the older half of this town. A house was built with a basement, and then a back porch became a room, a room became a kitchen extension, and a garage got attached. Each of those was built on whatever foundation was cheapest at the time, which frequently meant piers, a shallow perimeter wall, or a slab on grade with a void underneath. The result is a house sitting on two or three different foundation types, and the cold room is always over the one that was added last.
Different eras of addition, different things underneath
It is worth establishing which decade the addition belongs to, because it decides what is down there. The oldest have bare soil, no membrane and often no perimeter wall worth the name. The seventies and eighties versions usually have a wall and vents, and batt pushed up between the joists that has been falling out for thirty years. The most recent have a membrane and a proper perimeter but were closed up with no access. Three different starting conditions, three different scopes, and they can all be present under one house.
Bringing it inside rather than insulating the floor over it
The instinct is to insulate between the floor joists and leave the void outside the building. It performs poorly and it is worse under an addition, because the services feeding that addition run through the crawl and stay in the cold. Sealing the ground, then insulating and sealing the perimeter walls, brings the space inside the building and puts the pipes and ducts on the warm side of the envelope. On an older Stony Plain house that is also the change that stops the smell rather than merely reducing it.
Getting into a space that was closed up and forgotten
Access is the practical constraint on nearly all of these. Some have a hatch in a closet, some have an exterior door at grade, and a good number have nothing at all because whoever built the addition never expected anybody to go back in. Where a crawl space is accessible the foam takes a thermal barrier or an ignition barrier over it, and which applies follows from how the space is used rather than its size, so on a Stony Plain house both the access and the covering get established on the visit and priced together. More on thermal barrier vs ignition barrier.
Crawl Space Spray Foam Insulation Stony Plain: Common Questions
Why is only the back room cold? That is the usual pattern here, and the back room is normally the one over the crawl.
What if there is no way in? That happens on additions of a certain age. Making an access is part of the job rather than a problem.
Should we insulate the floor instead? No. It leaves the services in the cold and it does not stop the air movement.
Size the assembly with the R-value calculator, then get a free Stony Plain quote. More on Crawl Space Spray Foam Insulation Alberta.