Spray foam roofing in Calgary is a commercial low-slope proposition, and in this city the first question is always the same one. Before anything about insulation or drainage, an owner wants to know what happens when it hails.
Hail is the question everyone asks first
Calgary sees more damaging hail than anywhere else in the country, and it is a fair thing to ask about any roof system. The honest answer is that a foam roof is a surface like any other and severe hail can mark it. What it does not do is fail at a seam, because there are no seams: the assembly is continuous, so damage stays local rather than becoming a path for water across the building. Repair is also local, which is a genuine difference from a system that has to be opened up to be fixed.
Chinook cycling and a continuous surface
Calgary's winters swing rather than settle, and every swing moves the roof deck. A system made of sheets joined together accommodates that movement at the joints, which is where it eventually tires. A monolithic surface has nothing to work loose, and that is the property that matters most in a climate that cycles this often. It is a different argument from the one made in a steadier market and it is the stronger one here.
Where it suits a Calgary building
The buildings it fits are low-slope commercial and industrial roofs in the city's industrial areas: warehouses, shops and light manufacturing with a flat expanse and existing roofing that is nearing the end of its life. It is less often the right answer on a small residential roof or anything with significant pitch, and saying so early saves everybody a site visit.
What the survey has to establish
This is a survey-first system and there is no honest way around that. What is on the roof now, how many layers, what the deck is, whether it holds water, where it drains and what condition the existing insulation is in all decide whether a recover is possible or whether a tear-off is the only route. That is a look from the roof itself, not a description over the phone, and it is the step that makes a Calgary quote reliable rather than provisional.
Spray Foam Roofing Calgary: Common Questions
What about hail? Severe hail can mark any roof surface. The difference is that a foam roof has no seams to fail, so damage stays local and the repair is local too.
Does chinook cycling affect it? It is one of the reasons it suits Calgary. A continuous surface has no joints to work loose, and this climate moves a roof deck more often than most.
Can it go over what is already there? Often, and that is the usual case. Whether a recover is possible depends on the layers, the deck and whether the existing insulation is wet, which is what the survey establishes.
Size the assembly with the R-value calculator, then get a free Calgary quote. More on Spray Foam Roofing Alberta.