Ice dams: What causes them, why they're a problem and what you should do about them

Ice damming is pretty common in areas that get lots of snow and very cold temperatures like Saskatchewan. We seem to be coming across quite a few this year. The image below from the University of Minnesota gives a quick overview of how they happen.

This article from the same source goes into more detail and includes some suggestions on how to fix it if you’re experiencing damming on the roof of your home.