Options for moving drain vent

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by YahtzeeDIY, May 28, 2021.

  1. YahtzeeDIY

    YahtzeeDIY New Member

    Joined:
    May 28, 2021
    Location:
    Southern California
    Ran into a little snag while demo'ing our second story master bath (location: California). There was a tiled bench/ledge that filled in the corner between the vanity and tub. Hiding underneath, is a 1.5" drain vent coming out of the 2x6 external wall before dropping into the sub-floor. The sink drains also come out of the wall in the same fashion. Below the bottom plate of this wall is some sort of engineered wood something or other. The plan was to have a new tiled floor and a freestanding tub, but this vent obviously interferes with that!

    What are the options for moving this drain vent? I assume there's some code preventing the notching/drilling of the beam beneath the bottom plate and would explain why this was done in the first place? Could the drain vent be moved more towards the sink area and hidden under that vanity?

    We plan on hiring a licensed plumber for the work, but I'd like to get an idea of what we're up against before bringing someone out. Appreciate any and all comments, concerns, and suggestions. I'm not "in the trade" so if any terms I've used are wrong, feel free to correct me.

    And yes, that is electrical that is coming out of the far wall before diving into the sub-floor ...

    Overview:

    IMG_1434.JPG

    Top-down, marked up view:

    IMG_1435_edit.jpg

    The drain vent in question:

    IMG_1436.JPG

    The engineered wood ???:

    IMG_1437.JPG
     
  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    Using a 2" trap and trap arm for the tub gives you five feet before the vent. Is that enough to get you into the sink cabinet? Some codes allow more length, but you're UPC and not IPC code.
    And yes, they were avoiding the engineered beam.
     
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  4. wwhitney

    wwhitney Well-Known Member

    Joined:
    Mar 17, 2019
    Location:
    Berkeley, CA
    I'm unclear on the overall geometry of the bathroom drains, but it looks like there's a good chance the tub could be wet vented via the lavatory. In which case that vent could be eliminated. Unless there's something else going on that isn't apparent.

    Cheers, Wayne
     
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  5. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    Yes, I would also look at that possibility.
     
  6. YahtzeeDIY

    YahtzeeDIY New Member

    Joined:
    May 28, 2021
    Location:
    Southern California
    Really appreciate the responses! To answer your questions, the layout was a two-sink vanity about 84" long with a shower adjacent. I can see from the wye that the tub drain is connected to at least one sink drain, though presumably they'd both share. Also, it looks like the shower drain is headed towards the sink/vanity area. Oh, and I don't know if this matters, but the drain vent in question is 1.5".

    IMG_1457.JPG

    IMG_1458.JPG

    The shower picture was taken from the walkway into the bathroom. There's a water closet and toilet behind me/camera.

    I believe 5' would be plenty as the freestanding tub will be larger and the drain will need to move closer to that wall. So it sounds like moving that drain vent into the wall and vanity area would be one option.

    How would you determine if wet venting is an appropriate option?

    Thanks in advance. :)
     
  7. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    If the lav is to wet vent the shower, the wet portion of the lav should be 2" and then the vent can be 1.5"
     
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