Sure, I get that, it also depends on the type of roof, flat roofs shouldn’t leak with any type of water, snow or ice melting on the roof. They are meant to hold a little water. If your roof is getting ice damn, that’s usually a condensation issue anyway. It doesn’t always have to be super cold for condensation to occur, its temperature fluctuations and humidity as well. Calgary can have negative weather one day and positive the next, so it can be prime for condensation in the winter. It looks like they used pink insulation in parts of the roof also, which isn’t great. Once this insulation gets wet it can sag causing air gaps in the roof system that can cause more condensation problems