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Thread: Can bath sink and utility sink drain into 1.5"...PHOTOS

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  1. #1
    DIY Senior Member Hammerlane's Avatar
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    Default Can bath sink and utility sink drain into 1.5"...PHOTOS

    Can I have a bath sink and a garage utility sink draining into a 1.5" drain?

    Photo #2 is looking the opposite way as photo #1.

    I'm rethinking my garage utility sink install. I posted a question about 2 weeks ago concerning that. Have another question. Attached are two photos of my main stack in basement. The 1.5" I have labeled in red is showing the drain for a 1st floor bath sink that eventually ties into the 2" before the stack.

    In photo #2, the garage is on the other side of the wall to the left of photo.

    In photo #1, can I connect the garage utility sink drain to the 1.5" that is horizontal right above the I-Beam(using a wye)?

    Or do I have to extend the 2" a little and cut in a 2 x 2 x 1.5 wye where the run of the wye would pick up the existing bath sink and the tap of the wye would pick up the garage utility?

    As a note I will be using an AAV to vent the garage utility and the length of 1.5" shown in the basement photo is about 14 feet. Then there is probably another 5 feet of 1.5" in the wall to the bath sink.
    http://www.terrylove.com/forums/show...Drain&p=358664
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    Last edited by Terry; 10-25-2012 at 09:16 AM.

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    A "Sink" is run with 2" waste, 1.5" trap arm and vent. Kitchen, Laundry Tray
    The "Lav" can be 1.5" for everything. A lavatory in a bathroom.

    And even for lavs; when the second basin is added, the code bumps you to 2"

  3. #3
    DIY Senior Member Hammerlane's Avatar
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    Quote Originally Posted by Terry View Post
    A "Sink" is run with 2" waste, 1.5" trap arm and vent. Kitchen, Laundry Tray
    The "Lav" can be 1.5" for everything. A lavatory in a bathroom.

    And even for lavs; when the second basin is added, the code bumps you to 2"
    If I understand correctly from the above statement, the answer to my question is NO, I can't have both
    a lavatory sink and a garage utility sink draining into a 1.5" drain.

    But the garage utility sink can be 1.5" up until it ties into the 2"??

    Thanks.

  4. #4
    Test, Don't Guess! cacher_chick's Avatar
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    Quote Originally Posted by Hammerlane View Post

    But the garage utility sink can be 1.5" up until it ties into the 2"??

    Thanks.
    Anything beyond the trap arm should be 2".

  5. #5
    Forum Admin, Expert Plumber Terry's Avatar
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    An inspector would want to see the laundry sink run with 2" until the vent and trap arm.

    A 2" pipe is twice the volume of a 1.5" pipe.
    A 3" pipe is the same as two 2" pipes and one 1.5" pipe.

    Lav, 1.0 DFU
    Lavs, in sets of two or three, 2.0 DFU
    Kitchen or Laundry sink, 2.0 DFU
    Bar sink, 1.0 DFU
    Last edited by Terry; 10-22-2012 at 04:26 PM.

  6. #6
    DIY Senior Member Hammerlane's Avatar
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    Quote Originally Posted by Terry View Post
    An inspector would want to see the laundry sink run with 2" until the vent and trap arm.
    I'm gonna have to look up sink, lav, laundry definitions and see how that compares with a slop sink for a garage. As a note the sink in garage will not be used for laundry....just a place to wash up instead of having to bend down to use spigots....see photo below. The two foam wrapped copper lines in photo #2 in post 1 are the hot/cold spigots in the photo below.

    But if a garage sink has to be all 2" thats not a big deal.

    Thanks again
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    Last edited by Hammerlane; 10-22-2012 at 03:55 PM.

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    DIY Senior Member kreemoweet's Avatar
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    What you personally intend for the use of any given plumbing fixture is immaterial, in the eyes of Plumbing Correctness. The building,
    and its plumbing system, will usually see a lengthy series of occupants, and highly varied use patterns.

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