Back to back toilets

Discussion in 'Toilet Forum discussions' started by JimBt, Sep 30, 2008.

  1. JimBt

    JimBt New Member

    Sep 30, 2008
    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. psolutions

    psolutions New Member

    Sep 30, 2008
    South Carolina
    Plumbing Toilet

    Is your home on a crawl space or a slab?
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  4. JimBt

    JimBt New Member

    Sep 30, 2008
    The bathroom is on the second floor and the new one will be too.
  5. Basement_Lurker

    Basement_Lurker One who lurks

    Jun 21, 2007
    I smash things and demand money.
    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.
  6. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    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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