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 January/February 2010 Issue
Roof Topography & Ice Damming 
by Greg Labbé
Walk through neighborhoods in the wintertime and you will notice distinct patterns in the ice dams, depending on when the house was built.
We know that ice dams form when there is lots of snow, and winter temperatures are mild; and that heat escaping from the top floor of a house into the attic causes snow to melt, move down the roof, and refreeze at the eave. But walk through neighborhoods in the wintertime and you will notice distinct patterns in the ice dams, depending on when the house was built. There is no doubt that poor construction techniques—a disregard for good air sealing and thorough insulation—are largely responsible for the formation of ice dams. But what about poor design?
The fact that...
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