How to replace cast iron toilet flange on concrete floor

Discussion in 'Toilet Forum discussions' started by tala9999, Feb 11, 2020.

  1. tala9999

    tala9999 New Member

    Joined:
    Jan 30, 2020
    Location:
    Virginia
    I'm trying to replace the broken rusted cast iron toilet flange in my basement. I think it's joined by lead to the drain pipe. I tried to drill through the lead join but it's really thick, about 2 inches. Also tried to torch the joint for few minutes but the lead doesn't seem to melt either. I saw some people using grinder to cut the flange and remove it piece by piece.

    Can you advise what is the way to remove the flange?

    Another question is the size of the toilet drain pipe. Mine looks like 3 1/2 inches (picture below) instead of 3 inches or 4 inches. Not sure I can use any of these because they are 3 inches or 4 inches:
    https://www.lowes.com/pd/Oatey-3-In-PVC-Twist-N-Set-Closet-Flange/50315029
    https://www.lowes.com/pd/Oatey-4-In-Twist-N-Set-PVC-Toilet-Bowl-Flange/50315037

    Thank you.[​IMG]
     

    Attached Files:

    • T1.jpg
      T1.jpg
      File size:
      119.2 KB
      Views:
      109
    Last edited: Feb 11, 2020
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    I would be thinking of putting a 3 inch Danco Hydro Seat on top of the finished flooring, and keep what you have now. That is like repair ring with a tail. Use wax ring under. Normally the toilet just goes on top of that.

    Alternatively, use a repair ring with ears to hold down the toilet.

    If your objective is to remove the ring, keep drilling, and don't give up so easily. The lead is only in the top inch or so of the slot. But as you point out, once you get that off, then what?
     
    tala9999 likes this.
  3. Sponsor

    Sponsor Paid Advertisement

     
    tala9999 likes this.
  4. tala9999

    tala9999 New Member

    Joined:
    Jan 30, 2020
    Location:
    Virginia
    The reason I want to remove it is to replace it by the plastic one. However, I believe the finished floor will be higher than that so I think you are right, I just need to put the new one on top of the old flange and leave it there. Just thinking how to attach the repair ring to the broken flange.

    BTW, can someone tell whether my drain pipe is 3 inches or not?
     
  5. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    The repair ring and the Hydroseat both have legs/ears that you can screw into the surrounding concrete. I like Tapcon screws. They sell the right drill next to the screws, or possibly bundled with the screws.

    I am thinking Tapcon 3/16 in. x 2-1/4
    I would like to have the hex head, but the Phillips head is more readily available in 3/16 locally.

    Others prefer lead anchors for concrete. Those may have advantages, but I have not used them.

    https://images.homedepot-static.com/catalog/pdfImages/c0/c063f0ba-e028-42fd-9652-a519dfcf1198.pdf
     
    tala9999 likes this.
  6. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    tala9999 likes this.
  7. Sylvan

    Sylvan Still learning

    Joined:
    Sep 23, 2004
    Occupation:
    plumbing - fire suppression - boiler inspector
    Location:
    New York
    Many of the post offices were built WPA era and had a Durham system

    Easiest way is to carefully cut out the entire flange and use an inside caulked one
     
Similar Threads: replace cast
Forum Title Date
Toilet Forum discussions Reuse or Replace Cracked Cast Iron Toilet Flange? Nov 3, 2017
Toilet Forum discussions Replacement toilet for older home with Cast Iron pipes Oct 11, 2015
Toilet Forum discussions Cast Iron / Lead Flange Condo - Repair / Replace Jul 22, 2015
Toilet Forum discussions Cast iron flange replacement? Not level, not bolted down Jul 10, 2015
Toilet Forum discussions Replace Cast Iron Toilet Flange or not? Apr 21, 2013

Share This Page