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Thread: add washer hookup

  1. #1
    DIY Junior Member thaas53's Avatar
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    Default add washer hookup

    Hello,

    I need to move our washing machine to a room that shares a wall with a bathroom. Since the bathroom is on the other side, I have access to water and drain. After reading through a bunch of threads and looking at Terry's standard washer install photo, I've come up with a piping diagram. I'd like to know if this looks correct. I'm in Connecticut. The image is not to scale.



    Thanks for any help.
    thaas

  2. #2
    Master Plumber-Gas Fitter shacko's Avatar
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    Your layout looks fine.

  3. #3
    Test, Don't Guess! cacher_chick's Avatar
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    Your use of fittings is not correct in the view of most.

    The transition from horizontal drain to vertical drain should be sani-tees, not wyes. When stacked as you have them, they should be close coupled.

    A picky inspector might insist on a Wye & 1/4 bend "combo" for the vent in the drain line. Similarly, a vent tee is preferred in the dry vent piping.

  4. #4
    Moderator & Master Plumber hj's Avatar
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    In your situation, you DO NOT have to use a sanitary tee for the connection to the vertical drain. A combo would be preferred for the washer vent connection, and as a "piece of mind" measure, you might want to install a cleanout in the vertical vent. The shower vent should already be installed so the kind of fitting to use and its orientation should already be in place. The washer vent connection to it can be with any fitting you want to use.

  5. #5
    Test, Don't Guess! cacher_chick's Avatar
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    I don't doubt hj, but I would like to better understand what makes a wye more or less appropriate than a sani-tee when connecting the horizontal to the vertical drain.

  6. #6
    Forum Admin, Expert Plumber Terry's Avatar
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    UPC code has always required the santee when going from a horizontal trap arm to a vertical stack.
    The original picture the homeowner is going from, had a santee in that location, not a wye fitting.

    The wye fitting in that location creates an S trap which can be more likely to siphon a trap.

  7. #7
    Plumber jimbo's Avatar
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    Running a trap arm into a wye on the vertical, the vent takeoff point may be below the weir of the adjacent trap, thus causing siphon.

  8. #8
    Moderator & Master Plumber hj's Avatar
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    A sanitary tee is ONLY required when the vertical pipe is also the vent for the trap. Here, they have an "independent" vent on the arm, so it makes no difference whether the connection is a sanitary tee, a combo, or a "Y" with an 1/8 bend. Now, if they piped it differently so that the trap was going into the vertical "independent" vent, then THAT connection would have to be a sanitary tee, but that does not apply to the way they have drawn it.

  9. #9
    Forum Admin, Expert Plumber Terry's Avatar
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    Concur, I was thinking only of the lav waste arm.
    The fittings on the washer drain as drawn are fine. It's vented off the horizontal correctly.

  10. #10
    DIY Junior Member thaas53's Avatar
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    ok, great so the lavatory sink to vertical drain stack needs to be a sanitee?

    Thanks for taking the time everyone.

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