As a result of a remodeling job, the workers capped off a sewer pipe
that was once properly vented out the roof. They must not have
realized that I had a basement bar sink that is a part of same set of
My symptom was that the bar sink would no longer drain properly. This
made sense to me: there needs to be a vent so that air can be drawn in
to help the system drain.
The OTHER symptom was sewage getting sucked through the bar sink P-
trap and belching up a foul sludge into the sink (I've remodeled my
bathrooms before and have had my head nearly in the toilet sewer hole
and yet I've NEVER smelled a smell like this). This was strange, this
part of the sewer circuit is not active and should not have material
Does the vent also serve other purposes other that proper drainage?
Without it, does it create some sort of, I don't know, vacuum that
pulls sewage towards pipes that would otherwise be clear?
Connecting this pipe back up with the vent in the roof would be a
considerable effort. So I put an indoor vent cap on the end of the
pipe. It supposedly lets air in but won't allow are to come out. I
don't get sludge backups anymore but I do get sewer smell. I take it
that these indoor vent caps don't work very well.