Re: Big chunk of ice on top of sewer vent on roof
Posted by e-plumber on January 30, 2004 at 19:50:13:
In response to Re: Big chunk of ice on top of sewer vent on roof
: Hi there,

: My wife and I moved into a new house 7 years ago. Last winter we noticed (for the first time) a real strong odor in the master bathroom. Well, after a little hunting, there was a big ice chunk on top of the vent pipe up on the roof. Due to the wad of snow and ice up there, I did not venture up and after a week or so the temperature went up and the ice cleared.

: This year, when the temperature went down below -25degrees Celcius, the same thing happened. The cold snap was not as long this year, but after 3 days of this stink, it was getting a little anoying. When I looked at the vent pipe there was a 6-8 inch candle of ice protruding out of the vent, and every other house in the subdivision also had one.

: Are there any tips or tricks to prevent this?? I have read about sticking a copper pipe down the vent to absorb the heat, special filters for the top to eliminate smells out in the yard, heat tape, etc. but nothing specific to keeping the ice candle out of the vent pipe.

: Any thoughts or assistance would be grateful,

: Dwight

I don't know if installing elbows on the stack vent would cure the problem. We get an occaisional closure only on 2" pipe and under. If there is access to the attic, I would suggest increasing the size of the pipe that passes through the roof to 5" or 6", I cannot see how that would frost up to the point of closure.
Good Luck. e-plumber

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