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Thread: Flange Extension Question

  1. #1

    Default Flange Extension Question

    Hi I am a new homeowner, and before I start moving in, I decided to tile the bathroom floor. Prior to tiling the floor, I have removed the toilet, and cleaned the flange removing the old wax ring.

    The old flange is cast iron, and from what I see, it is in good condition. However, it sits about 1/3 below the new tile floor & backerboard I have installed. I have purchased a flange extension kit, and am preparing to reinstall the toilet.

    The problem I am having is this: the screwholes in the flange extensions do not match the screwholes on the cast iron flange, and I am not able to screw the flange extensions to the flange. Is it okay to just apply the adhesive to the flange extension & flange, or will this cause a problem down the road?

    Thanks for the help!

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    If you are going to use the flange bolt slots in the CI flange and can do it through the extender, sealing the extender to the CI should work fine to minimize the required wax buildup. Don't expect the toilet to be anchored properly if you use the slots in the extender if it isn't screwed down to the floor or the flange.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Aspiring Old Fart, EE, computer & networking geek Mikey's Avatar
    Join Date
    Nov 2005
    Central Florida


    I'm not familiar with flange extensions -- what forms the seal between the original flange and the extension? Is there a gasket or some wax in there?

  4. #4
    In the Trades kordts's Avatar
    Join Date
    Oct 2005
    exurban Chicago


    Just drill holes thru thr flange extenders where you need them. Use caulk or a thin schmeer of wax between the cast iron collar and subsequent extenders to form a good seal.


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