Plumbing Through Posts

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by aaron_808, May 19, 2020.

  1. aaron_808

    aaron_808 New Member

    Joined:
    May 18, 2020
    Location:
    San Jose, CA
    Hi Everyone,

    Is it normal to run a 1.25” ABS vent through a 4x4 post that is supporting a 4x12 parallam and is a hold down? Even with a stud shoe, it doesn’t sound like a great idea to me. Is there a better way to vent this? It’s for a double lav. An AAV would be awesome but I don’t think I’m allowed to use one here.

    Thank you in advance. This is an awesome forum!
     

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  2. wwhitney

    wwhitney Well-Known Member

    Joined:
    Mar 17, 2019
    Location:
    Berkeley, CA
    Definitely not normal. It could work if it is engineered and the engineer designed for it.

    Otherwise, find another route, even if it means bringing the vent out of the wall and boxing it in with a soffit.

    Cheers, Wayne

    P.S. To a first approximation, if the post only has tension/compression forces on it, and you drill out 1.5" of width from 3.5" of width, you've reduced the capacity by 3/7. So the capacity could be restored by using a bigger member. Or by designing a steel plate to reinforce the post around the hole. But it takes an engineer to do any of that.
     
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  4. James Henry

    James Henry In the Trades

    Joined:
    Jul 23, 2019
    Occupation:
    Plumber
    Location:
    Billings, Montana.
    Build another stud wall in front of that one and put a shelf on top of it. you will only loose 4".
     
  5. aaron_808

    aaron_808 New Member

    Joined:
    May 18, 2020
    Location:
    San Jose, CA
    Thank you for the quick replies. Like I said, awesome forum! These are great ideas. The whole vanity area has yet to be designed so I think a box under that window and above our mirrors would fit right in to hide the pipe. Thanks again!
     
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