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lonecedar
Vent pipe frozen

Wondering if anyone has trouble with the bathroom vent pipe on the roof freezing up solid?Two months ago i had a septic smell throughout the house,after awhile i figured i would check the pipe opening hoping nothing would of got caught in the pipe.I did find the top 8 inches of pipe frozen with ice.I can understand how this can happen being the pipe is fairly warm being inside the home and the last few feet being exposed to the cold and the air being vented is somewhat moist.I have lived in this home for 5 years and this is the first year this has happened.I have had to clear the pipe several times since then.We have had a very cold winter here in N.Y. so far.I did put a 90 elbow on the pipe thinking it would keep snow from falling into the pipe.Didn't seem to help. Any info would be great!

JLMCDANIEL
Re: Vent pipe frozen

I wonder if a bathroom vent fan was added and connected to the vent stack?

Jack

lonecedar
Re: Vent pipe frozen
JLMCDANIEL wrote:

I wonder if a bathroom vent fan was added and connected to the vent stack?

Jack

The bathroom vent is vented through the roof in its own vent.

MSSP
Re: Vent pipe frozen

In cold situations like that the vent pipe should have been increased in size for that exact reason. It is called frost enclosure in the code book. If possible get into attack and replace about last three feet of pipe where it goes through roof with the next larger size.

bill
Re: Vent pipe frozen

mssp is correct, In Canada the code calls for a 4 inch pipe going from well below the roof to at least 6 inches above to allow for this freeze up.

Bill

lonecedar
Re: Vent pipe frozen

The pipe is a 3 inch pipe with more than 2 feet above the roof.Even when the house is not being used(vacation for 9 days)the pipe will freeze.

lonecedar
Re: Vent pipe frozen

I should mention that it doesnt freeze solid,most times tapping on the side of the pipe will release the ice crystal buildup.It will build up enough to stop the flow of sewer gas from escaping.Now that i have put a 90 degree elbow on the pipe,you can actually see water (condensation) drip from the end of the pipe,at a very slow rate.Its strange to me ,cant figure it out.

Jim
Re: Vent pipe frozen

Hi lonecedar Take a look at this website i have these onmy house fro three years now works great. Both my vents would plug twice a week at -20F.

This does the job   www.nofrostventing.com

Dobbie

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