When do I need to worry about ice dams?

I just finished watching Joe Lstiburek talk about ice dams (https://youtu.be/Ld8pzIu45F8). He says you need to be concerned about ice dams in a “high snow load area”, which he defines… I just finished watching Joe Lstiburek talk about ice dams (https://youtu.be/Ld8pzIu45F8). He says you need to be concerned about ice dams in a “high snow load area”, which he defines…Read MoreGreenBuildingAdvisor