Turning old bathroom into utility room (washer and dryer)

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Marlin8, Aug 20, 2021.

  1. Marlin8

    Marlin8 New Member

    Aug 20, 2021
    Marlin, Texas
    Hello, pardon if this has already been discussed! I bought an old house (built in 1930) that has an old bathroom with toilet sink and shower. Pretty sure this was an addition perhaps in the 1960s or 70s. Anyway I want to take everything out and put in a w/d. Which drain should I hook into - toilet, sink or shower? It is a concrete slab floor - but I don't mind digging out a trench of some sort. Thanks.
  2. WorthFlorida

    WorthFlorida The wife is still training me.

    Oct 28, 2009
    Orlando, Florida
    Code requires a 2" drain. For the time period the sink will probably be 1.5". Not sure about the shower drain. The other concern is proper venting. They are plenty of pictures on this forum on a proper plumbing for a washing machine. You cannot connect any fixture or drain you currently have. The trap for the washer must be above the floor. Do you plan a utility sink? If you have the room you'll want one.

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  4. Tuttles Revenge

    Tuttles Revenge In the Trades

    Oct 15, 2014
    If you extend the toilet drain, you'll have the largest capacity pipe needed. As Worth mentions, the minimum size drain for any laundry is 2". But you might bring the 3" up into the wall to have a full sized cleanout available.
    Marlin8 likes this.
  5. Reach4

    Reach4 Well-Known Member

    Sep 25, 2013
    Marlin uses 2015 International Plumbing Code.

    You have to use 3 inch once the 2-inch laundry standpipe joins anything else unless you do this:


    With 3 inch, you can have the laundry sink and standpipe separate.

    Might as well consider adding an "emergency" floor drain while you are busting things up.
    Marlin8 and Tuttles Revenge like this.
  6. Michael Young

    Michael Young In the Trades

    Sep 20, 2016
    North Carolina
    in my area, we are required to pipe the horizontal run from a clothes washer with 3" pipe. So if the code is the same as mine, you'd want to dump the CW into the 3" pipe
    Marlin8 likes this.
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