February and March are usually ice-dam season in the Montreal area. I’ve written before about ice dams What’s an “Ice Dam”? and Ice Dams – Cures, fixes and band-aids. and it’s time to look at what you need to do to make the problem go away.
The first thing to look at is the source of the problem, which is excessive heat transfer to the roof, the consequent melting of snow, and the freezing of the melt at the eaves and valleys.
This post will review the various components that contribute to the formation of ice dams, and will suggest a number of ways these can be corrected.
Consulting PG 