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Thread: Laundry Room Drain Set-Up - is it okay?

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  1. #1
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    Default Laundry Room Drain Set-Up - is it okay?

    I am replumbing the laundry room in our house. I staged the fittings that I am planning on using to see if it is an okay setup. I am using a 2 inch vent (out the roof) and drain with combination tee wye fittings for the washing machine drain with a separate vent before draining vertically (also a separate sanitary tee for the sink). I am hoping this will provide excellent flow for the washing machine drain. Thanks for any pointers and checking my work/thoughts.

    See attached image/link.

    http://picasaweb.google.com/BriceBer...28355001721874

    -Brick
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    Plumber krow's Avatar
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    loose the 45 degrees between the trap and the vent, unless its on the same plane. Pipe will slope between the trap and vent , 1/4" per foot or 2% or not exceeding 1 pipe diameter.

    I'm not sure in your state, but some northern states require the vent to penetrate through the roof in 3" minimum (to combat build up of frost from condensation), but inside the house it can be 2"

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    I see, so basically just use some gradual slope instead of using the two 22.5s between the trap and vent, which give a steeper slope.

    Just curious, is there a reason the 22.5s would cause a problem in the system or are they just pointless to have.

    I am in Missouri and am only required to have a 1.5 inch roof vent, but am using a 2 inch, so I should be fine on that.

    Thanks much for your help.

    -Brick

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    Plumber krow's Avatar
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    Quote Originally Posted by bmb2m9 View Post
    Just curious, is there a reason the 22.5s would cause a problem in the system or are they just pointless to have.
    Aside from being pointless, you would be creating an S-trap, which is against code. The S-trap will have a tendency to syphon the water out of the p-trap, causing sewer gases to come back into your home

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    Wow, my question seems stupid with your superb explanation. That makes perfect sense, I just never thought of it like that.

    FYI - I have an S-Trap in one bathroom sink because it was done years ago in my 1960s rancher. But you are right, I need to do it right, to code.

    Thanks!

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    Aside from the 22.5s I assume I am in good shape?!

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    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    You are also creating a S trap by using the combo on the washer waste. A san tee is the better choice.

    John

  8. #8
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    You are also creating a S trap by using the combo on the washer waste.
    I see... I thought that it would be okay (maybe even better) since it is vented before going into the combo and down the vertical drain?! Am I wrong? Is this idea another pointless part of the setup?

    Thanks for the help and insight.

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