Garage spray foam insulation in Morinville is two unrelated jobs wearing the same name, because the attached garage belongs almost entirely to the newer half of the town and the older half has detached buildings standing on their own at the back of the lot.
An attached garage shares surfaces with the house
Where the garage is built into the building, the wall between it and the living space and the ceiling under any room above are not garage surfaces at all. They are exterior walls of the house that happen to have a garage on the other side, and they were built to that standard on paper. Whether they were finished to it is the question, because those are the surfaces trades reach across during construction and they are behind drywall by the time anybody would notice. That is the whole job on the newer half of this town.
A detached building is a shell with nothing to share
On the older half the garage is a separate structure, frequently on a slab poured directly on grade, with an unlined roof and walls that may hold nothing at all. Nothing it does affects the house, so the reason to work on it is entirely about what the owner wants to do in it. That makes it a different decision from an attached garage, where a household is usually trying to fix a cold room rather than warm the garage, and the two enquiries should not receive the same quote.
What the cold room above an attached garage is telling you
The complaint that brings most Morinville households to this subject is a bedroom over the garage that will not hold heat. The floor of that room sits over an unheated space, its joists usually run out to the exterior on three sides, and the band around its perimeter is exposed on all of them. Adding depth under the floor does very little because the loss is at the edges rather than across the middle, and sealing that perimeter is what actually changes the room.
Heating an attached garage sends more than heat into the house
Households on the newer half frequently want the garage warm, and it is worth understanding what that does before committing to it. A vehicle driven in wet gives off water for hours, and in a warmed sealed garage that moisture has somewhere to go, which is through the shared wall and the ceiling into the house. A garage that is heated is a garage that needs its separation from the living space finished properly and its own ventilation considered, and in a Morinville house those two things are what make the difference between a useful warm space and a humidity complaint.
Garage Spray Foam Insulation Morinville: The Covering Requirement
Foam sprayed in a garage is covered by a thermal barrier in the same way it is in the house, and on an attached garage that requirement is not optional at the shared wall because that wall is doing a separating job as well as an insulating one. On a detached Morinville building the covering is decided by what the space is used for, and it is settled at the survey rather than left to the end. More on thermal barrier vs ignition barrier.
Garage Spray Foam Insulation Morinville: Common Questions
Why does the room over the garage stay cold? The loss is at the perimeter of that floor rather than across it. Depth underneath changes little.
Does a detached garage need a different approach? Then it is about what you want to use it for. It has no effect on the house.
Is the shared wall special? Yes. It is an exterior wall of the house and it does a separating job at the same time.
Size the assembly with the R-value calculator, then get a free Morinville quote. More on Garage Spray Foam Insulation Alberta.