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Join Date: Sep 2005
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12-16-08, 02:15 PM   #3 (permalink)  
Two suggestions...

1) When vent pipes go up through the roof in cold locations, code often requires them to be upsized one size within the heated space (or 2' from the roof). The larger pipe diameter makes it more difficult to actually freeze. (how large is your vent right now?)

2) Can you tell if it's iced over because of snow/rain? Or is it buried by snow on the roof? You may be able to get away with just extending the pipe higher and possibly adding a "U" so it's pointing downward.

Of course, both these solutions rely on you going up on the roof - which is not a good idea if it's snowy and/or icy, but you get the idea.