Re: roof vents
Posted by Dale's Plumbing Service LMP on January 18, 19100 at 21:10:58:
In response to Re: roof vents
: Recently the vent in my attic became blocked with snow cyrstal or ice
: , this caused a negative air pressure and sucked the water out of the traps cuasing
: gases to eneter in to the house hold. Why did the pipe block up with snow cystals, does it have to be vertical , i how i prevent this next time .regards

Alix, the mim size of this pipe should be 3" and should not decrease in size to 1 ft below the roof. This should be a vertical vent.If it continues to do this in extreamly cold times i would put a heat tape around it. I'm sure you do not want to increase this to 4" or larger but then again that would help also.Dale's Plumbing Service LMP


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