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Thread: Toilet drain extension for remodel

  1. #1
    DIY Junior Member AlterB's Avatar
    Join Date
    Mar 2013

    Default Toilet drain extension for remodel

    Hi all,

    I'm a rather handy plumbing neophyte.

    I'm getting started on a bathroom remodel. My initial focus has been on the shower stall. Tonight I removed the toilet to start planning for the non-shower tile.

    The toilet is currently on OSB + CBU + tile. The new floor will be on the OSB + 1/2 ply + Ditra + a thicker tile. I don't have exact measurements yet, but the new height of the flange *may* be higher than the current one.

    The drain is 3" ID PVC, a closet flange cemented to the outside of the drain. There is no underneath access without cutting out ceilings below (upstairs bathroom). I will have access once I remove the tile.

    If I need to extend the drain higher, what are my options to research? I assume I need to keep the 3" ID drain, therefore an insert flange is not a good idea? When I have access to the floor, can I cut band extend the drain using a coupling?

    Thank you,


  2. #2
    Test, Don't Guess! cacher_chick's Avatar
    Join Date
    Jan 2008
    Land of Cheese


    An insert in a 3" pipe makes the I.D. even smaller, which is not something I would prefer on a toilet. Whether you can fit a coupling on the riser will depend on how long the riser is to begin with. If it is short, you will have to replace the closet bend and the riser.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    It depends on what's actually there. They make an inside pipe cutter that would allow you to cut the old stuff out. If you can't put a coupler and a riser but you do have a socket in the fitting below, they also sell a special drill bit designed to cut out the pipe on the inside, allowing you to glue in a new riser. See if, once the toilet is out, you can tell how much drop it has (probably not much if it's on the second floor and in the ceiling) and if there's a riser at all rather than a closet bend. A pro may be able to remove the existing flange while leaving enough of the pipe to install a new flange, but it's chancy - a good joint literally welds the plastic of the two pieces together by melting the surface of each. They normally do not like to come apart!
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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