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Thread: Question on venting for a double vanity

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    DIY Junior Member REXAMUS's Avatar
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    Default Question on venting for a double vanity

    So I had someone finish some plumbing for me since I have been too busy to mess with it.

    He finished yesterday and I had time to go review the work today. Correct me if I am wrong but unless something changed recently...Terminating the vent pipe in the crawl space is no bueno right?

    Also, would using an AAV off a dual sink and putting it in the wall cavity also be incorrect?

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    Last edited by Terry; 09-12-2012 at 02:44 PM.

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    Forum Admin, Expert Plumber Terry's Avatar
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    The AAV only works if it's accessible and ventilated.
    They make boxes with grills for that purpose.

    Also, two lavs should be run with 2" pipe, and then the individual trap arms and the vent can be 1.5"

    Last edited by Terry; 09-24-2012 at 03:36 PM.

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    DIY Junior Member REXAMUS's Avatar
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    Running the pipe to the attic and using the AAV up there would be acceptable though right? Also, did you agree with the vent pipe terminating in the crawl space in picture #1 being COMPLETELY wrong?

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    Forum Admin, Expert Plumber Terry's Avatar
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    Terminating the vent pipe in the crawl space is no bueno right?
    That seemed so crazy I didn't think to respond.
    No vents should terminate in a crawl space. Vents should go through the roof.

    If the AAV in the attic can be accessed, that would be okay. A vent lets out gas though, so a "vent" would extend through the roof. I used to install five or six vents through a roof a day. It's not that hard.

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    DIY Junior Member REXAMUS's Avatar
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    Well the sad part is that there is already a vent exiting the roof above the area where he just left it in the crawl space. He said that he just capped the vent on the top of the roof and didn't need it because of the way he ran the plumbing. Unfortunately that was on Monday and I have been working and just now got time to go look at everything.

    Quite sad that someone who calls themselves a plumber could be such an idiot.

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    In the Trades Tom Sawyer's Avatar
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    That vent in the crawlspace can't be a vent either because it's horizontal
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

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    Lol, I just noticed that too. Definitely not planning on giving them the rest of the money until they fix all of the issues.

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    Forum Admin, Expert Plumber Terry's Avatar
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    It may be useful to pull a permit on the job. That way you have a local plumbing inspector looking at it.

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    Moderator & Master Plumber hj's Avatar
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    I am not sure which line is the terminated vent, but it is almost impossible for a line under the floor to be called a "vent" in the first place, especially if there are no traps under the floor for it to "vent". He must also have been in too much of a rush to "anchor" the water stubs through the wall. OR maybe he doesn't know how to do that either.
    Licensed residential and commercial plumber

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    DIY Junior Member REXAMUS's Avatar
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    Quote Originally Posted by hj View Post
    I am not sure which line is the terminated vent, but it is almost impossible for a line under the floor to be called a "vent" in the first place, especially if there are no traps under the floor for it to "vent". He must also have been in too much of a rush to "anchor" the water stubs through the wall. OR maybe he doesn't know how to do that either.
    Yea...good times. Perfect reason why I have done everything myself in the past. Just haven't had time to mess with the plumbing.

    I've got another question. I have two different places to run a vent pipe but they are both where the bottom plate sits on a floor joist so I can't really go through it. Any ideas? I can get pictures if necessary.

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    Moderator & Master Plumber hj's Avatar
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    I assume you will have a cabinet under the sinks. If so, then run the vent on a 45 against the joist and into the wall inside that toe space. we do it all that way all the time.
    Licensed residential and commercial plumber

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    DIY Junior Member REXAMUS's Avatar
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    Quote Originally Posted by hj View Post
    I assume you will have a cabinet under the sinks. If so, then run the vent on a 45 against the joist and into the wall inside that toe space. we do it all that way all the time.
    Would this work? Black = Drain line, Red = Vent pipe, Yellow = Approx floor joist location

    Excuse my terrible drawing. Basically a wye for the vent to come off the drain line from the tub and then i would have to figure out how to bring it back towards the wall cavity and then back vertical. Maybe a couple of 45 degree elbows?
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    Last edited by REXAMUS; 09-25-2012 at 04:18 PM.

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    DIY Junior Member REXAMUS's Avatar
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    *Bump*

    Looks like some 22.5 degree elbows would work better with the previous picture I posted. Any suggestions?

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