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Thread: Washer and sink drain questions

  1. #1
    DIY Member techinstructor's Avatar
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    Question Washer and sink drain questions

    I have two code questions.

    The first one concerns the drain line from a clothes washer.

    The washer drain will connect to a horizontal drain that will also carry waste from the lavatory and tub. This horizontal drain will then connect via a combo wye to the main 3" horizontal drain that goes to the vertical drain that goes out to the septic tank. I'm unsure of the terminology, but I would think that the horizontal drain that the washer, lav, and tub feed into would be considered a horizontal branch drain. If this is true, then do I need to use 3" pipe for that horizontal drain per N.C. code 406.3

    406.3
    The waste from an automatic clothes washer shall connect to a vertical branch drain of not less than 2 in diameter, or a horizontal branch drain of not less than 3 in diameter.
    The inspector looked at my plan and actually told me to use 2" for that drain, but it seems that his advise is not in sync with the code. The problem is the inspectors rotate jobs, and I'm not assured that the inspector who told me this will be the one who actually does the inspecting.

    Second question.

    I have a double sink in my kitchen. Is there anything in the code that says which type of continuous waste outlet I can use? I cannot find any reference to it, but again, I may not know the correct terminology.

    The inspector drew one that had an end outlet like this one:


    But I prefer to use the one with the center outlet like this one:


    It's a spacing issue, but I could make either work. Both have a baffle tee, so I can't see why it would matter. Please advise.

    Thanks

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    You can always plumb better, but not worse.
    Go ahead with the 3" horizontal on the washer waste line.

    Most plumbers prefer the end outlet for the kitchen sink.
    I'm not a big fan of the center connector.

  3. #3
    DIY Member techinstructor's Avatar
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    Quote Originally Posted by Terry View Post
    Most plumbers prefer the end outlet for the kitchen sink.
    I'm not a big fan of the center connector.
    Is it more susceptible to clogging? Just wondering why.

  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
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    It's hard to get the proper grade in the middle.

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    DIY Member techinstructor's Avatar
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    Quote Originally Posted by Terry View Post
    It's hard to get the proper grade in the middle.
    Do you mean that these have to be installed so that the pipes slope 1/4" per foot from the drain to the tee?

  6. #6
    DIY Senior Member dlarrivee's Avatar
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    Quote Originally Posted by techinstructor View Post
    Do you mean that these have to be installed so that the pipes slope 1/4" per foot from the drain to the tee?

    Always... Everything needs to slope downstream...

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