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Old 01-05-2012, 01:12 PM   #1
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Bathroom sink venting


We have a sink in the bathroom that is slow to drain. This is an addition to the house and I can't find where the sink is vented. The attic above is not accesible so a roof vent is out. Is it possible to add a small vent line and go through the exterior wall and up the outside wall with a small vent line?

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Old 01-05-2012, 05:24 PM   #2
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Bathroom sink venting


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We have a sink in the bathroom that is slow to drain. This is an addition to the house and I can't find where the sink is vented. The attic above is not accesible so a roof vent is out. Is it possible to add a small vent line and go through the exterior wall and up the outside wall with a small vent line?

Yes, it is possible.

Will your jurisdiction allow you put an ugly pipe on the exterior wall?

Who knows.

Andy.

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Old 01-05-2012, 06:28 PM   #3
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Bathroom sink venting


no sure where you live but i would consider installing auto vent under the sink would need a picture has the drain always been slow.... has it been snaked out...ben
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Old 01-05-2012, 06:40 PM   #4
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Bathroom sink venting


If it's a bathroom--there must be a vent for the toilet--Where is the sink in relation to the toilet?

Have you removed the P-trap to see if there is a T inside the wall?
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Old 01-05-2012, 07:40 PM   #5
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Bathroom sink venting


I was just going to ask if the v-200 vents wear out after 28 years. My game room sink has a septic smell only when I run water.
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Old 01-05-2012, 07:42 PM   #6
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I was just going to ask if the v-200 vents wear out after 28 years. My game room sink has a septic smell only when I run water.
not that expensive change it you will find out ....but yes they do go bad...ben
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Old 01-05-2012, 07:46 PM   #7
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Bathroom sink venting


Thanks, Ben. I'll go get a new one.
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Old 01-05-2012, 07:49 PM   #8
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Thanks, Ben. I'll go get a new one.
welcome
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Old 01-06-2012, 08:42 AM   #9
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Bathroom sink venting


There is no toilet in this room, only a shower and sink. We live in the country so no zoning issues to consider plus there is a huge bush in front of the wall where I was thinking of adding the exterior vent. How do I get info on the under the sink vent?
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Old 01-06-2012, 07:23 PM   #10
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Bathroom sink venting


just ask any clerk in the plumbing dept at lowes,h.d..or hardware...they will give you what you need....if you can get us some pictures we can help you figure out howw to install under sink...ben
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Old 01-06-2012, 08:24 PM   #11
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Bathroom sink venting


It's called an AAV---air admittance valve--Google images will have a picture--
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Old 01-07-2012, 09:24 AM   #12
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After trying several things, I gave up and hired a plumber. We installed an under sink vent, snaked the lines out to the septic tank, replaced all the undersink drain lines and $450 later, the problem is still there. It appears to have something to do with the pop up stopper. When the stopper is completely removed, the drain works great. When the stopper is there, even with a half inch between the rubber o ring on the bottom and the top of the seat, it still backs up the running water. I even cut two of the 4 guide vanes off, thinking they were restricting, no affect. This is a 2 year old one piece sink and counter top. Does the overflow vent have anything to do with getting air behind the draining water? Could it be stopped up or restricted somehow? So far my best solution seems to be a rubber stopper and chain!!!
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Old 01-07-2012, 09:38 AM   #13
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Bathroom sink venting


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...one piece sink and counter top.
Does the overflow vent have anything to do with getting air behind the draining water? Could it be stopped up or restricted somehow?
It really shouldn't...
Stopper the sink to overflow level and see if it goes down easier.
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The pipe coming out of the wall... how much lower than the sink drain is it?
Have you opened that wall yet to see how the dwv is set up?

Last edited by TarheelTerp; 01-07-2012 at 10:03 AM.
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Old 01-07-2012, 11:00 AM   #14
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Bathroom sink venting


the drain pipe drops vertical through the floor about 24" directly into the 4" pipe leading to the septic tank
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Old 01-07-2012, 06:01 PM   #15
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Bathroom sink venting


I've read of that problem here----with those mixing bowl type sinks--(vessel) -

Solution,as I recall, was a different brand of pop up ---Rare--I bet the plumber felt pretty dumb--

(well paid,but dumb)

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