leaky toilet riser in concrete floor

Discussion in 'Toilet Forum discussions' started by 1morefool, Aug 2, 2011.

  1. 1morefool

    1morefool New Member

    Messages:
    2
    Location:
    oregon
    I installed a 4" ABS DWV riser when I poured the concrete for my basement floor. After it all cured, I cut the pipe flush with the floor, and glued in a toilet flange inside the 4" pipe (with a knock out to enable leak checking). When I filled the vent stack, water gushed from below the flange (bad glue joint?). I knocked out the removeable plastic, and stuck an inflation ball 8" down into the 4" pipe to complete my stack test, and all held fine. Now, how do I fix the bad glue joint? Ideally, I'd like to cut off the top 2-3inches of the riser including the bad flange (from the inside of the 4", not busting any concrete), find a long tail 3" insert, and some kind of flexible donut seal outside the new 3" and inside the existing (embedded in concrete) 4" riser. I have 18" of vertical 4" below the floor. Any help or advice is appreciated. Thanks
  2. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,274
    Location:
    Land of Cheese
    If it's an inside fit flange, you should be able to cut a few slices in the inside of the flange and break it loose from the pipe.

    If you need to cut the riser, you have plenty of riser pipe to allow you to cut it off and install a new section of 4" pipe with a coupling. You will need to chip away enough to get the coupling down the hole. A shop-vac with a small diameter hose works wonders when cleaning out the area around the existing pipe.
  3. cwhyu2

    cwhyu2 Consultant

    Messages:
    1,348
    Location:
    Cincinnati OH
    I`m sorry man but you might have to get the jack hammer out.
    That being said,it must be from the flange glued into the 4" pipe if there are no other fittings between the
    flange and the 90 deg ell 18" below the finished floor.
    You can try to cut out the inside flange and install a 4" over the pipe flange.
    There is no donut or 3" flex pipe that will help you.
  4. Terry

    Terry Administrator Staff Member

    Messages:
    15,413
    Location:
    Bothell, Washington
    Like Casher Chick mentioned, it can be split out if you cut the flange off, and then cut a portion out of the inside and then take a flat blade screwdriver and continue on around splitting it out.
  5. 1morefool

    1morefool New Member

    Messages:
    2
    Location:
    oregon
    any experience with this fix? Oatey 43650

    http://www.**************.com/Prod/...N-Set-Replacement-Closet-Flange/84441/Cat/156

    This part looks like it might seal against a scuffed interior wall of the 4" embedded pipe after I break out the bad glue joint. Any thoughts?
  6. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,274
    Location:
    Land of Cheese
    Purple primer will soften and smooth out the surface. Brush it in thoroughly before you glue up a new flange.

    Good PVC flanges have a stainless steel mounting . The all plastic ones tend to crack.
  7. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,185
    Location:
    NW Ontario, Canada
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