Lav plumbing question

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by r0bh3, Dec 3, 2012.

  1. r0bh3

    r0bh3 New Member

    Messages:
    3
    Location:
    Massachusetts
    Hello, I've been lurking for a while and now it's time to tackle a project of my own.

    I would like to locate a Lav in this space. I would like to run the vent vertical in the wall to the left of the window. Question is, can I get there with the trap arm? Can there be a 90* bend in the trap arm and can it extend roughly 60"?

    The plan is to have the plumbing concealed under that window with a short wall then it will enter the vanity console from the side.


    Thanks!

    [​IMG]
    Last edited: Dec 3, 2012
  2. Terry

    Terry Administrator Staff Member

    Messages:
    14,911
    Location:
    Bothell, Washington
    A 1.5" lav drain can be 42" to the vent.
    You can go 60" with a 2" trap arm.

    What you are trying there looks a bit dicey. I can't think of seeing it done that way in the last 38 years of plumbing. I would move the plumber closer to the lav drain.
  3. r0bh3

    r0bh3 New Member

    Messages:
    3
    Location:
    Massachusetts
    Thanks Terry, I guess I thought I was 'pushing' it a little with this design, hence the reason for the question. You say, move the plumber closer to lav drain, do you mean the vent fitting?
  4. Terry

    Terry Administrator Staff Member

    Messages:
    14,911
    Location:
    Bothell, Washington
    Yes, the vent fitting.
  5. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    I think terry means move the waste pipe closer...not necessarily an easy DIY job. Besides the vent issue...which you could deal with by taking off a vent and running it up and above the window....you would have potential clogging issues with a long trap arm. Unless you were very careful to have slope....assuming you used a 2" drain and it did not exceed 60" then you would have to drop an inch and a quarter . A plumber looking at your house ( the parts we can't see!!) might have better ideas.
  6. r0bh3

    r0bh3 New Member

    Messages:
    3
    Location:
    Massachusetts
    Understood, thanks for the replies.

    I know these drawings aren't great but here is a little more info. 3" main waste line runs here just under floor in basement, there is a WC about 4' downstream from where I want to tie the Lav drain in, and a shower drain about 1' upstream. Would adding a vent where the yellow line, running it up and over ceiling and tying into existing vent in attic help at all?

    [​IMG]
  7. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,515
    Location:
    Cave Creek, Arizona
    Yes, but then you would NOT need the "red one" on the left side of your drawing.
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