TBrownMA
New Member
I installed two pedestal sinks side-by-side in a bathroom, replacing a single bowl vanity. I plumbed it using 1.5" p-traps in a pretty typical way. Each sink's p-trap leads to a single 2" pipe running horizontal for about 3-6 feet (6' run for farther sink, 3' run for closer sink) to a vent that goes through the roof.
With this setup, sink drainage seems OK but there is always a gurgling sound. I don't think there are any clog issues. I'm assuming the gurgling is because the horizontal run from the farther sink is like 6-7' from the vent pipe, and there should be a vent after the farther sink (see attached diagram).
It's a ranch, so there is attic immediately above the bathroom. But the vent is cast iron in the attic, which would make it a pain to tap into. Would it be effective run a second vertical vent after the farther sink, and use an air admittance valve (AAV) in the attic (like 8 feet above the sink)? Would this solve the gurgling problem?
I know AAVs aren't generally favored, but maybe it would be OK in this case since there's a roof-vent so close by?
Thanks for any information!
With this setup, sink drainage seems OK but there is always a gurgling sound. I don't think there are any clog issues. I'm assuming the gurgling is because the horizontal run from the farther sink is like 6-7' from the vent pipe, and there should be a vent after the farther sink (see attached diagram).
It's a ranch, so there is attic immediately above the bathroom. But the vent is cast iron in the attic, which would make it a pain to tap into. Would it be effective run a second vertical vent after the farther sink, and use an air admittance valve (AAV) in the attic (like 8 feet above the sink)? Would this solve the gurgling problem?
I know AAVs aren't generally favored, but maybe it would be OK in this case since there's a roof-vent so close by?
Thanks for any information!