closet flange ring rusted out in concrete slab????

Discussion in 'Toilet Forum discussions' started by jkrause, Oct 12, 2007.

  1. jkrause

    jkrause New Member

    Apr 9, 2007
    I'm in the process of having my bathroom remodeled and after the tile demo guys pulled the toilet I noticed the closet flange is totally rusted out beyond repair...... I trip to the H. Depot and a with the plumbing dude.... he reccomend that I cut the top of the old flange off using a inside cutting saw on my drill and slide a larger closet flange over it .. I do it..... well I'll be darned.. the concrete is poured directly around the ABS pipe.... the original flange has a 3" ID ....

    Any ideas or help would be greatly appriciated.... :rolleyes:

    Can I use a twist n seal type flange???? what are the options here... either way the old flange was messed up....
  2. markts30

    markts30 Commercial Plumber

    Sep 25, 2006
    Commercial Plumber
    Phoenix, AZ
    3" is too small for the twist and seal flange (inside the pipe - too much constriction)...
    chip out around the pipe (carefully ) and glue another flange on the outside or remove the flange from the inside and replace it...
    If you are not sure how to do this, there are instructions elsewhere on this forum on flange repair - search for older threads....
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  4. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego, CA
    Chipping out enough space to install a new flange will probably not be that difficult. Get a good cold chisel and a 3 pound mallet.

    Another possibility is to screw down a repair flange to the concrete. Care must be taken to ensure a seal between that and what is left of the old plastic/steel assembly. If you had a picture , it would help.

    Here are two examples. Similar items are available store, hardware store, maybe even club stores.

    Last edited by a moderator: Jan 19, 2008
  5. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    Your original mistake, if I am reading this properly as to the type of flange you had, was to cut the top off instead of removing the metal ring and using a "wraparound" replacement. Now your only real option is to cut the concrete away, and install a flange that fits on the outside of the pipe, (or hopefully the old flange may have the proper o.d. to glue to the new flange. Not all do.)
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