Laundry room DWV advice

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by antamy, Apr 12, 2021.

  1. antamy

    antamy New Member

    Joined:
    Apr 12, 2021
    Location:
    Illinois
    Hi - I am remodeling a laundry room. Below is an unfinished basement, where I'd like to run the 2" drain pipe within a 10" deep joist cavity. Laundry room will have washer, utility sink and floor drain. Is the attached layout acceptable? Can I use one vent pipe for everything, or does the sink need its own vent? Should I put the washer p-trap as low as possible and run the sink into the vertical pipe instead?

    My challenge will be the floor drain which will be a a tight squeeze.

    Not shown is the path of the drain pipe - facing this wall, it would basically go in a straight line away from the wall, so somehow I would need to fit a long turn elbow and a sanitary tee to the floor drain in that joist cavity. I have a 14' run before I would do another long turn elbow and the bottom of the pipe has to be no more than 10" from the floor at that point, in order to clear a steel beam.

    Advice appreciated!

    upload_2021-4-12_12-44-34.png
     
    Last edited: Apr 12, 2021
  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    The washer and the sink need their own vents. edited

    [​IMG]
     
    Last edited: Apr 12, 2021
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  4. antamy

    antamy New Member

    Joined:
    Apr 12, 2021
    Location:
    Illinois
    ok, thanks. I have no idea how I can physically get a vent to the floor drain!
     
  5. James Henry

    James Henry In the Trades

    Joined:
    Jul 23, 2019
    Occupation:
    Plumber
    Location:
    Billings, Montana.
    The floor drain does not require a vent as long as their is a vent somewhere on the drain it is connected to on the same floor. All floor drains are considered a combination waste and vent.
     
  6. antamy

    antamy New Member

    Joined:
    Apr 12, 2021
    Location:
    Illinois
    That's what I would have thought. The current configuration has the washer and floor drain separately vented and they also connect separately into a big 4" cast iron pipe that runs around the perimeter of my basement. I'm trying to figure out a way to get rid of that and snug up the PVC (which is now permitted in my area) to the joist so that I can finish the basement!
     
  7. antamy

    antamy New Member

    Joined:
    Apr 12, 2021
    Location:
    Illinois
    The photo above is very useful, however my city has an amendment to the State code which says "(D) Concealed horizontal waste arms. Concealed horizontal waste arms are prohibited." That would seem to imply that no pipe can run horizontally and I have to drain the washer and sink separately. Is this a common thing?
     
  8. James Henry

    James Henry In the Trades

    Joined:
    Jul 23, 2019
    Occupation:
    Plumber
    Location:
    Billings, Montana.

    You need to find out what the definition of "waste arm" is in your code, they might be referring to the trap arm which some fixtures conceal to hide the plumbing.
     
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