Installing a Toilet flange on porcelain tile floor

Discussion in 'Toilet Forum discussions' started by motonutz123, Jul 28, 2011.

  1. motonutz123

    motonutz123 New Member

    Jul 20, 2008
    New York
    I'm redoing my bathroom DIY except for the floor. I have a wooden subfloor that I will have porcelain tiles and backerboard installed on. Is it standard practice to mount the toilet flange on top of the tiles and drill holes through the tiles to the subfloor to fasten the flange or is a product like this a better choice ? Any suggestions or comments are appreciated. Thanks
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    Before we get too far, when you say wooden floor, is that dimmensional planks, or plywood? You can't put cbu on dimmensional wood need at least 1/2" ply on top of it. The planks move too much. The ply is much more stable, and tile need stabile! Make sure to install the cbu in a fresh mortar (thinset) bed and tape the seams as indicated in the instructions.

    The easiest way to handle the flange is to notch the tile before you lay it so you don't have to drill holes. You can drill, but you likely would need special bits (a diamond core bit probably works the best). You really do want the flange well attached to the subflooring. Check out for help on tiling.
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