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Thread: Basement Sink Installation

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  1. #1
    DIY Junior Member UpTheRiver's Avatar
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    Default Basement Sink Installation

    Hello Everyone.

    I need to install a small sink in our basement. I plan to run the drain into the pipe shown here. The existing soil pipe serves one bathroom with two sinks, one of which gurgles, a toilet, tub, and shower. It does not serve any other areas of the house.

    The sink will be located twenty pipe feet from the CL of the soil pipe against a to-be-built interior wall perpendicular to the concrete wall in the picture. Two 90 degree elbows will be required, one to turn into the interior wall, and one to turn toward the sink.

    I have zero access to the vent stack for the soil pipe in the picture. I do have access to a vent pipe for a different soil pipe serving a bathroom in another part of the basement. However it will be a long run, probably 40 - 50 feet. It will be impossible to maintain a constant slope in the horizontal part of the run.

    For what it's worth AAVs seem to be legal here.

    Comments or recommendations anyone? Any suggestions will be greatly appreciated.
    Thank you for any help you may be able to provide.
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  2. #2
    Consultant cwhyu2's Avatar
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    Look above there might be a vent there that is capped off.
    Show a picture where the 3" pvc goes up .
    We might be able to see it.
    Looks like a future rough.

  3. #3
    DIY Junior Member UpTheRiver's Avatar
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    Thanks for the quick reply.

    I'm at another location right now, so no additional pics for several days. I believe I would have noticed any capped off vent lines. though. I looked it over, trying to find one without success.

    It is a future rough, intended for a sink installed right next to the soil pipe. AFAIK, that would not have required a vent. Unfortunately, the situation dictates that it be installed in another location.

    Quote Originally Posted by cwhyu2 View Post
    Look above there might be a vent there that is capped off.
    Show a picture where the 3" pvc goes up .
    We might be able to see it.
    Looks like a future rough.
    Last edited by UpTheRiver; 07-12-2011 at 12:24 PM.

  4. #4
    Consultant cwhyu2's Avatar
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    You can put an AAV in but you must have access to it when it fails.

  5. #5
    Test, Don't Guess! cacher_chick's Avatar
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    I would look at the floor layout in the main floor, as the most reliable solution would be to run a vent up through an interior wall into the attic, where it can go through the roof or be connected to an existing vent stack within the attic.

  6. #6
    DIY Junior Member UpTheRiver's Avatar
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    There is no way for me to run a new vent pipe to the attic. I can get to an existing vent pipe (different stack) by running a line up in the basement trusses under the main floor. Its a long run, and there is no way for me to have a constant slope. There are just too many obstacles to deal with.

    If a long run is not a problem and a perfect constant slope isn't required, it's doable.

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