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Thread: Marble Base under Toilet

  1. #1
    DIY Junior Member
    Join Date
    Mar 2010
    New York

    Default Marble Base under Toilet

    I recently purchased a new home and the toilet in my half bath sits on this painted platform. I originally thought it was just plywood, but last night my wife and I scrapped off the paint that it seems that it is marble. It is really ugly and sticks out above the existing floor about a 1/4 of an inch. My house was build in the late 60's and I'm guess that this was there as an extra support of for the toilet.

    We would like to remove the marble and make the floor all the same height. I was just wondering if anyone had any experiences or recommendations for getting this slab of marble up. is it something that is just attached to the subfloor or am i opening up an can of worms by taking this out.

    Any suggestions or help is appreciated.


  2. #2
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Yakima WA


    Pretty hard to say what you'll find under that slab, but there are some basics that will have to be addressed. First, the floor under the toilet has to be solid and level. If it is not, then you will have some more work to do. Assuming the old floor covering will be removed, you may find you will have to cut some of the floor and sub floor out and replace them. This should not be too difficult if the joists are in good condition. Of course the flange will have to be removed and be replaced later. The new flange should rest on top of the finished floor, be screwed to through the finished floor and into the sub floor, and be level. If the floor under the slab is already in good condition, then you just need to replace the flange. The flange is the last thing to do as it must rest on top of the finished floor be it vinyl, tile, or wood.

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


    In some places, those were required by code. Probably not true any more, but an old plumber may have been involved and used one because 'that's the way we did it'. The idea, I think, was to keep the toilet from falling through the floorboards if the toilet leaked and the floor got compromised. It was also likely that it would be flat, whereas planks might not be.
    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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