Does this sound like a venting problem - plumbing

Question

I have one drain in my bathroom that drains normally, but every so often it won't drain until a certain depth is in the basin (sink) then drains keeping that level in the basin. After it drains, or when the water flow slackens a bubble will come out of the drain and then the water will all drain from the basin. It's not repeatable, but I wonder if it might also be responsible for my occasionally slow to drain toilet.

Is this what a venting problem does, or am I describing something different?

ds549 · Accepted Answer

check  trap under sink first for clog.

buffalobill · Answer

it could be. other times the under-the-sink view includes an old styleS trap which seems to make more resistance to the water to drain thanthe P traps of today.i have an oversized 2" S TRAP under my 1-1/2" kitchen sink withstrainer basket removed and am seeing the backup problem unsolved by anadd-a-vent under the sink even when replaced by a new one.i see any temporary backup water miraculously disappear when dishdetergent is squirted into the sluggish drain.[i am wondering if the 2" s trap must be a 1-1'2" p trap; [any morehelp would be welcome on this]see your rooftop for location of actual 4" soil stack pipe rising abovetoilet rooms and sometimes separate venting for a new bath or kitchenthru the roof in a 2" pipe.SEE VENTING AT: could be blockage after the toilet and after the sink but before thesoil stack.see: S-TRAP PICTURES AT: P TRAPS AT:Eigenvector wrote:

Eigenvector · Answer

> it could be blockage after the toilet and after the sink but before the>Well I'm using all P-traps, but they're all PVC, so it's possible there is a stubborn clog in there that isn't fully removed and slowing down the draining.How is the drain secured to the wash basin, A long time ago I tried to remove the trap to replace it with a more modern equivalent, but couldn't get it to budge - is it puttied on, glued on, or just stuck on with years of oils, grease, and similar horrors?

buffalobill · Answer

usually plumber's putty, a rusted nut, and rust.ok, and sludge. :)Eigenvector wrote:> > it could be blockage after the toilet and after the sink but before the> >

Goedjn · Answer

Air bubbles generally mean venting issues, yes.

Does this sound like a venting problem - plumbing

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