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Thread: Back to back toilets

  1. #1

    Default Back to back toilets

    I have an old house and would like to add a bathroom. If possible I`d like to create the new bathroom back to back with the existing one, sharing the wet wall. My question is how to install a toilet back to back with the existing one. Are there fittings available for 2 toilets on the same stack. My old stack is cast iron so I`m going to have to cut it off and install PVC. The venting shouldn`t be a problem but I can`t figure out the main connection.

    Any help and stories of experience would be appreciated.

  2. #2
    DIY Member psolutions's Avatar
    Join Date
    Sep 2008
    South Carolina

    Default Plumbing Toilet

    Is your home on a crawl space or a slab?
    Plumber in Columbia SC
    Plumbing Solutions LLC
    Residential Plumbing & Repair

  3. #3


    Quote Originally Posted by psolutions View Post
    Is your home on a crawl space or a slab?
    The bathroom is on the second floor and the new one will be too.

  4. #4
    One who lurks Basement_Lurker's Avatar
    Join Date
    Jun 2007
    Victoria, BC


    You need to use a double fixture fitting, and not a sanitary cross. And you need to be aware of the maximum length for a toilet arm allowed by your code.
    Broken promises don't upset me. I just think, why did they believe me? -Jack Handy


  5. #5
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Bothell, Washington
    Blog Entries


    The new toilets do not work as well with fixture crosses as the old ones.
    The double santees do not work at all.

    With the quicker flushing toilets, it's important that they are vented and plumbed in such a way that the gush of water from one does not go up the other arm to the other toilet.


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