Spray foam roofing is a different product from spray foam insulation even though it comes out of the same rig. Here the foam is applied on top of the roof deck, over the existing assembly, and then protected by a coating that carries the weather. On a low-slope commercial or multi-family roof in the Bow Valley there are two reasons to consider it and one reason to be careful.
It fixes the seams, which is where low-slope roofs fail
A membrane roof fails at joints, laps, flashings and penetrations, not usually in the middle of a sheet. Foam goes down as a liquid and cures as one continuous surface, so there are no seams to open and it follows every curb, drain, vent stack and parapet without a detail having to be made. On an older Canmore commercial roof with a dozen mechanical penetrations through it, that continuity is the main attraction.
It adds insulation where there is nowhere else to put it
The other reason is that low-slope roofs on this stock are often under-insulated and there is no interior cavity to work with - the deck is the ceiling, or the space below is finished and occupied. Foam on top at about R-6 to R-7 per inch adds real performance without touching anything inside, and at roughly two inches it is already functioning as the vapour control layer on a roof that is pushing warm interior air at the deck all winter.
Slope can be built into it, and in a snow climate that matters
Because the foam is sprayed to a thickness rather than laid in sheets, drainage can be shaped into the surface - built up away from a low spot and tapered toward the drains. On a roof in a valley that receives a substantial snow load, that is not cosmetic. Meltwater that cannot reach a drain sits, and water sitting on a roof through a freeze-thaw cycle is how a roof assembly gets destroyed. Correcting a ponding area while re-roofing is one of the genuine advantages of this approach.
The coating is not optional, and at this altitude it is the whole job
Here is the reason to be careful. Polyurethane foam degrades under ultraviolet light, and at mountain elevation on a clear-sky site the UV load on a roof surface is severe - add snow on the ground reflecting more of it back upward through the shoulder seasons. Bare foam left exposed will chalk and break down. The coating that goes over it is what makes this a roof rather than an experiment, and it is a maintenance item with a service life, not a one-time purchase. Anyone quoting foam roofing in this valley without discussing the coating schedule is quoting half a system.
Whether it suits your roof is a site question
Foam roofing needs a sound, dry, properly prepared substrate and it needs weather to apply - temperature and wind limits are real, and in Canmore the application window is narrower than on the prairie. A wet existing assembly has to come off; a saturated insulation layer cannot be buried under new foam and forgotten. So the first question we ask is what is under the existing membrane and whether it is dry, because that answer decides whether this is a recover or a tear-off, and those are very different jobs.
One company, start to finish
Spray foam roofing Canmore is work we take care of ourselves. We scope it, we quote it, we schedule it, and our own installers are the ones holding the gun.
Spray Foam Roofing Canmore: Common Questions
Can it go over the existing roof? Only if what is under the membrane is sound and dry. A saturated layer must be removed, and we will probe rather than assume.
Does it need recoating? Yes. The coating is a maintenance item with a service life, and at this altitude the UV load makes that schedule important rather than nominal.
Can it fix a spot where water ponds? Often, yes. Thickness can be built up to reshape drainage toward the drains, which is one of the real advantages over sheet goods.
How much does spray foam roofing cost in Canmore? It prices per board foot over the roof area plus the coating system, so area, target thickness and how much tapering is needed set the number. Whether the old assembly can stay is the larger variable.
How do I get a spray foam roofing quote in Canmore? Tell us the roof area, the existing membrane type and whether there is any known wetness. We need to see the substrate before committing to a recover.
Size the assembly with the R-value calculator, then get a free Canmore quote. More on Spray Foam Roofing Alberta province-wide.