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    BOBO2's Avatar
    BOBO2 Posts: 3, Reputation: 1
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    #1

    Jul 4, 2010, 03:34 PM
    4" or 3" toilet rough in? 4 better?
    Just a quick question.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
    		  
    #2

    Jul 4, 2010, 04:08 PM
    You are much better with a 4 inch. You will need a 2X6 wall but you can usually hide it inside a closet. 4" is 30% larger and with a low flow toilet would help to keep it open.
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert
    		  
    #3

    Jul 4, 2010, 06:18 PM

    Depending how much space you have and how many plumbing fixtures you plan on connecting to this waste pipe. 3" will easily carry on bathroom group - then connect it to 4" main sewer somewhere along the way. As stated in response #2, it is easier to work with 3" pipe in tight places, like between joists, 2" x 4" walls, etc. Also, if you are fighting slope, 4" pipe requires only 1/8" per foot slope while 3" pipe requires 1/4" per foot of slope.
    BOBO2's Avatar
    BOBO2 Posts: 3, Reputation: 1
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    #4

    Jul 22, 2010, 04:16 PM
    Its on a slab that still has to be poured on lower floor. So I geuss 4 is the best size.
    BOBO2's Avatar
    BOBO2 Posts: 3, Reputation: 1
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    #5

    Jul 22, 2010, 04:16 PM
    Its on a slab that still has to be poured on lower floor. So I geuss 4 is the best size.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #6

    Jul 22, 2010, 04:50 PM

    My code, (SPC) mandates a 4" house main and 4" toilet branches under the slab. However, on as two story job we can reduce the toilet branch to 3" in then second story , Good luck, Tom
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