Sewer gas is backing up through the drain in one of our showers. We figured it was an issue with improper venting. I just tore out my shower, for other reasons, and planned on fixing the vent.
This is a two story house and the issue is in the master bathroom on the second floor. The toilet and shower each are vented with 1 1/2" pipe, but the vent pipes join together in the attic and run to the main 3" stack. When you flush the toilet, the water in the shower trap bounces a little. On windy days, the water in the toilet and the shower trap bounce. It is these days that the smell is the worst.
It is very puzzling because the smell is not consistent. Our thought is that maybe the toilet only having a 1 1/2" vent is causing an issue with the shower. We are planning on running an additional vent on the shower to hopefully take care of it.
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