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Old 05-26-2020, 01:12 AM   #1
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Damaged concrete at closet flange


Hi.
I pulled up my half bathroom's linoleum flooring to replace it with vinyl. The floor is concrete because we are at the bottom floor of a condo building. With the toilet removed, I can see that the hole in the concrete where the closet flange is seems to have a gap where concrete has broken away past the diameter of the flange and sewer pipe.












I was about to start putting down self leveling concrete on the floor but would like to know if I should repair this gap and if I should replace the closet flange?
If so, what method and material should I use for repairing the gap?










Just for extra info, the closet flange is 4" x 3" plastic and seems to be glued to the outside diameter of another plastic pipe, which is then on top of the sewage pipe.




Attached are pictures to show what I mean.
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Damaged concrete at closet flange-toilet-flange-2-.jpg   Damaged concrete at closet flange-toilet-flange-3-.jpg   Damaged concrete at closet flange-toilet-flange-5-.jpg   Damaged concrete at closet flange-toilet-flange-6-.jpg  
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Old 05-26-2020, 10:17 AM   #2
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Re: Damaged concrete at closet flange


My questions are: - Does the crack, or hole go all the way to the dirt?
- Is the drain stable and secured?
Sealing the hole may be fine.
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Old 05-26-2020, 10:21 AM   #3
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Re: Damaged concrete at closet flange


How far does the hole go down? Can you stick a tape measure down there and repost the pic?
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Old 05-31-2020, 02:09 AM   #4
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Re: Damaged concrete at closet flange


Hi again. Thanks for getting back to my question and sorry for the late reply; I have only been working on the renos at the weekends.

I removed the top of the flange because it was leaning slightly.
The flange is a 4"x 3" flange glued onto the outside diameter of a 3" pipe which seems to be hose clamped to the metal sewage pipe.

I only managed to get the top lip of the flange off but once I done this it revealed that there was gaps all round the flange.

Attached are photos to help show what I'm describing.

Does anyone have info for what type of how I will remove the rest of the flange and once I replace, what material to use to fill the gaps and the method.

Thank you.
Attached Thumbnails
Damaged concrete at closet flange-20200530_193700.jpg   Damaged concrete at closet flange-20200530_194831.jpg   Damaged concrete at closet flange-20200530_194841.jpg   Damaged concrete at closet flange-20200530_194852.jpg  
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Old 06-02-2020, 02:50 PM   #5
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Re: Damaged concrete at closet flange


HOW did you remove the top flange? Unless thats a clean piece of pvc that you can glue a new flange onto, you may have to break up some cement so you install a new riser to glue a new flange onto. If the pipe was stable, what possessed you to remove the top of the flange? Being a little off level isnt a big deal. The wax makes up for it.
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Old 06-02-2020, 03:37 PM   #6
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Re: Damaged concrete at closet flange


That riser can be cleaned up.

Regarding the concrete: I'd pack the hole full of mortar. And would even consider wrapping the riser with a piece of plastic, although probably not necessary.

Grout would probably be fine too.

Last edited by Biscuits; 06-02-2020 at 03:41 PM. Reason: add info
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bathroom , closet flange , concrete , plumbing , toilet


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