Replumbing a Bath

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by bergs54, May 6, 2013.

  1. bergs54

    bergs54 New Member

    Messages:
    11
    Location:
    California
    I've been reading this forum for a while and have found some really helpful advice and a vast amount of knowledge. Drawing on that advice, I have sketched out a design for the plumbing in my bathroom which is going to be remodeled shortly. The toilet and tub will be staying in the same locations. I will be adding a double lav and therefore the location of the existing one will change slightly. I have also attached a photo of the existing lav/toilet/main/vent connection. Some background:

    1) Total DFU's on house: 23
    2) Main line is 4" Cast Iron
    3) Existing vents through roof: 4" for main line/toilet (which I plan to replace with a 3"), 1.5" for shower and tub, 1.5 inch for kitchen.

    Basically, I would like to know if the drawings I have attached will fly. Thanks!

    Attached Files:

    Last edited: May 6, 2013
  2. Terry

    Terry Administrator Staff Member

    Messages:
    14,999
    Location:
    Bothell, Washington
    You are under UPC plumbing code.

    The double lav needs to be a double fixture fitting, and you can use med 90's on the trap arms. Long sweep would work too there.
    You do have a long sweep below, and that's correct.

    4" allows pretty much as many toilets as you like.

    I don't understand how the lav vents are tying in. It should be above 42".
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,615
    Location:
    Cave Creek, Arizona
    Good plumbing practice would also install a cleanout tee beneath the double fixture fitting.
  4. bergs54

    bergs54 New Member

    Messages:
    11
    Location:
    California
    Thanks for the responses.

    1) As far as the long 90's on the lavs. I'm slightly confused by the code -- I thought all horizontal changes of direction had to be "a one-sixteenth (1/16) bend, one-eighth (1/8) bend, or one-sixth (1/6) bend, or other approved fittings of equivalent sweep". Are the 90's on the lavs an exception or am I misreading the code?

    2) For the lav vent connection -- sorry, my picture isn't clear. I plan on tieing the lav vent in the third picture into the 3" main vent in the fourth picture well above 42".

    3) I thought I read somewhere on the forum that it was bad practice to dump the toilet directly into the main line as I have done. Is that true? And, if so, might there be a workaround you could suggest?

    4) I was hoping to avoid a cleanout cover in the wall because the lavs are pedestal sinks, but I guess I could hide the cover with a freestanding storage unit of some sort.

    Thanks again for assistance -- it is greatly appreciated.
  5. bergs54

    bergs54 New Member

    Messages:
    11
    Location:
    California
    So, based on further reading here, it looks like the toilet drain set up I had done above was incorrect because other fixtures drained in before the toilet vent. I have attached two different options which I believe fix that problem, and I was wondering if one would be preferred over the other. Thanks!

    Attached Files:

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