Back-to-back toilets react to each other when flushing, windy...

mrsfoxOctober 20, 2013

I thought I posted this before, but now I can't find it. Anyway, my toilets are back-to-back (two adjacent bathrooms) and the water in the bowl fluctuates/moves; when flushing one, water in the other will move and sometimes it will lose some water down the pipe. The water in both toilets also moves when it is windy outside and they will both lose water. I've checked under the house and there are no leaks, so I am guessing it's suction from the vent? Is there any way I can fix this? Our toilets are "eco-friendly" as it is and when they lose water, there is almost nothing there, so I have to flush to get more water and then flush again after using it, so it's not eco-friendly anymore. :( I've asked the plumber who installed the toilets and he seems to think there's nothing that can be done. Thoughts?

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Most likely would be major revision of the DWV system for those toilets. Strong winds will affect the water level in almost all toilets.

    Bookmark   October 20, 2013 at 12:41PM
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Hello. Sometime ago I read there is a relationship between a chimney and the peak of a roof for draw. Maybe you have a problem like that. I would try to put a p trap at the top of the pipe. Measure the pipe hopefully it's ABS. Don't glue it you may want to remove it later. If that doesn't work extend the pipe so it's higher than the peak on the roof. This is all a guess but a cheap try.
Good Luck Woodbutcher

    Bookmark   October 25, 2013 at 6:01PM
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A trap in the vent above the fixture ? That would be a major violation of the code and a terrible idea. Vents must be able to drain completely (empty) by gravity. If the trap filled with rainwater, there would be no venting at all.

    Bookmark   October 25, 2013 at 8:11PM
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Hi, If the trap filled up it would be miracle. The P trap is upside down. Think of putting an upside U on top of the pipe. One end hooks to the pipe the other open end points to the roof.

    Bookmark   October 27, 2013 at 8:21PM
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Understood. Two elbows would do the same and look neater. Not sure if it would do anything about the commode trap draining from lower pressure on the vent. Could be assembled temporarily without cement for easy removal if desired.

This post was edited by bus_driver on Wed, Oct 30, 13 at 15:55

    Bookmark   October 28, 2013 at 3:25PM
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woodbutcher, what does making the pipe higher than the roof peak do? I do have an elbow on top of the pipe and we had the installing plumbers move the direction of it opposite of the most common wind direction in our area, but it hasn't helped much.

bus_driver, what can be done about the commode trap draining from lower pressure on the vent?

Thanks for the ideas. :)

    Bookmark   November 5, 2013 at 3:14AM
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