Posted by Kirk Grau on December 31, 2014 at 14:01:40 from (98.235.64.137):
In Reply to: Re: Eeeewwwwww! posted by Straw Boss on December 31, 2014 at 13:25:33:
Been watching this today without a chance to reply. My suggestion was going to be that code requires a minimum size (I think 3") to prevent frost closure just as you are seeing so I'm surprised to see that you do have a 3" VTR (Vent Thru Roof). Can't say that I have ever seen anything like that around here.
You are also correct on the dynamics of what is happening once the vent frosts over that the lack of air is creating a vacuum and sucking the water from the traps.
Google Air Admittance Valve. My suggestion after seeing this would be to cut the vents below the roof and use the air admittance valve. Some codes don't allow them, but they would sure work in your situation. If you don't want to have to repair the roof you could probably "wye" into the vent pipe below the roof and put the AAV on that line.
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