That is a curious result that happens. Someone finally invests some serious money in upgrading their kitchen (or bathroom), installing beautiful cabinetry, gorgeous ceiling lights, and finally get the attractive and bright kitchen (or comfortable bathroom) that they always wanted. The following winter, an ice dam forms. The following year, the ice dam gets worse and the ceiling starts to leak after every thaw. What’s going on?
If you have a tar-and-gravel low-slope roof (typical of constructions in many areas in Montreal), you may consider changing the roofing material to something else. Two common alternatives to tar-and-gravel are two-ply membrane assembly and standing-seam hidden-fastener metal panels.