Replacing closet bolts set in concrete

Discussion in 'Toilet Forum discussions' started by mpd1975, Oct 2, 2005.

  1. mpd1975

    mpd1975 New Member

    Oct 2, 2005
    I am installing a new tile floor over concrete. The added height results in the closet bolts being too short to securely fasten the toilet again. The bolts are installed in the concrete. How can I remove these and install new longer bolts. There doesn't seem to be an easy way to get them out. Any help is appreciated.
  2. Lakee911

    Lakee911 I&C Engineer (mostly WWTP)

    Aug 23, 2005
    I&C Engineer (mostly WWTP)
    Columbus, OH
    Few wacks with a hammer ought to get them out. If not, hack saw them below the surface of the new floor. Don't let them fall into the pipe though! You should be able to place a new flange on top of the tile floor with new bolts. Do some searching of this forum and you'll find lots of posts about replacing closet flanges and changing floor heights.

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  4. Gary Swart

    Gary Swart In the Trades

    Sep 1, 2004
    Yakima WA
    Getting the old ones out will probably be a PITA! What I would try is to get them out as suggested, then using lead ferrels in the holes left. It's likely the holes will be too large for the ferrels, so you may need to use some hydralic cement to set them in, possible completely fill the holes with the cement then drill the holes for the ferrels after the cement has hardened. Use stainless steel screws into the ferrels to hold the flange. This is not super easy, but should be do-able.
  5. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    Or you could throw down a repair ring like this,
    Roto hammer some 1/4" holes in the concrete
    and use concrete anchors.
  6. plumber1

    plumber1 Plumber

    Aug 7, 2005

    If your only interested in the bolts, they make long closet bolts or did you mean bolts that are screwed into some sort of anchor?
  7. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    A proper installation has a flange fastened to the pipe, then the bolts slide into slots on the flange. If the bolts are into the concrete and there is no flange then it is a "handyman" installation, and you should do whatever is necessary to install them correctly.
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