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Thread: Lav plumbing question

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  1. #1
    DIY Junior Member r0bh3's Avatar
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    Default Lav plumbing question

    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!

    Last edited by r0bh3; 12-03-2012 at 09:07 AM.

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    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. #3
    DIY Junior Member r0bh3's Avatar
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    Default

    Quote Originally Posted by Terry View Post
    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.
    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?

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    Forum Admin, Expert Plumber Terry's Avatar
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    Yes, the vent fitting.

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    Plumber jimbo's Avatar
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    Quote Originally Posted by r0bh3 View Post
    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?
    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. #6
    DIY Junior Member r0bh3's Avatar
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    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?


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    Moderator & Master Plumber hj's Avatar
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    Yes, but then you would NOT need the "red one" on the left side of your drawing.
    Licensed residential and commercial plumber

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