Laundry Standpipe Venting Questions

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by jonathanspw, Sep 11, 2017.

  1. jonathanspw

    jonathanspw New Member

    Joined:
    Sep 11, 2017
    Location:
    Alabama
    I'm in a bit of a predicament I think but I'm hoping I found a solution.

    I'm currently remodeling my kitchen and as a result I'm messing with plumbing from a previous addition to the house where they added a laundry area. They tied it in all wrong and it's a mess so I've been planning on fixing it when I did the kitchen's plumbing which I'm doing now.

    So basically the current standpipe goes down into a vent elbow (no trap yet) to get horizontal to go over to hit another vent elbow to get vertical again, to another vent elbow to get horizontal again, then there's a P-trap...and up until I ripped it out a sink/DW dumped in right before said trap resulting in a double-trapped sink...yeah it's a mess.

    Anyway I'm fixing it all, no biggie. An issue I've run into though is that I don't really have a way to vent the standpipe with a proper vent dedicated vent. What I can do is run the standpipe straight to the main stack after the trap so in essence won't that be good enough? For what it's worth nothing else dumps into this stack above my proposed laundry hookup so I can't really think of any issues.

    Here's a diagram to try and help visualize what I'm thinking with the red being completely new that I'll add. Unfortunately I do have to go vertical again after the trap which is what I'm worried about.

    My area appears to follow 2015 IPC from what I can find. I'm not as much concerned with meeting my particular code as I am with this being proper by any means and the trap functioning correctly. I can't find anything expressly prohibiting this in code but I can't find anything supporting it either, or anything here on the forums where people have done similar.

    Untitled.png

    On a side-note, how acceptable is it to use the proper fittings (say a long sweep 90 and a few 45s) to get "over" to line up the post-trap pipe with the currently single piece of vertical pipe? It will look messy but with the proper fittings I can't think of why it wouldn't meet code. It'd be a pain to snake I guess but it's just a washing machine.

    Since I'm in a drawing mood...here's an example of what I'm talking about:
    Untitled2.png

    Thanks in advance for any help :)
     
  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    None of those work.
    The vent should be at the level of the trap and trap arm.
    You have them vented below which serves no purpose.

    [​IMG]
     
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  4. jonathanspw

    jonathanspw New Member

    Joined:
    Sep 11, 2017
    Location:
    Alabama
    Would the latter picture be acceptable of the 45s after the trap simply to use the existing hole going through the wall base plate?

    Not the news I was hoping for, but I think I can make it all "proper" if I run a vertical off of the trap arm up to (higher than the flood plane of the washer of course) an AAV in the wall behind an access panel?

    That's the most proper solution I can think of being within reason. With the way this addition was done a roof vent is basically out of the question but I'm willing to rip out some drywall to do this right.
     
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