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Old 06-27-2013, 09:06 AM   #1
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Basement Toilet Waste Line Issue


I was wondering if someone could help me determine the best option for a problem I unearthed in my basement yesterday when going to change out a toilet.

The toilet waste pipe is cast iron and the flange on it was beyond corroded and not supported by the floor. So I removed it in order to replace it with a compression flange.

Yet, the problem I now have is that I have a large hole and not enough floor around it to rest the flange on. This is probably why I've had so many issues with this toilet. The pipe also sits roughly 2" below floor level.

The hole goes concave around the pipe under the floor creating a large cavity and there are loose fill stones and other debris in the hole (likely for the french drain).

What are my options to get this back to workable?
Should I get a pipe extension to get it to floor level, then loose fill with more stones, and then concrete over that? Or do I have a real problem here and need to rip up the floor and redoing everything? Or maybe something else?
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Basement Toilet Waste Line Issue-flangeinstalled.jpg   Basement Toilet Waste Line Issue-flangeremoved.jpg  

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Old 06-27-2013, 09:39 AM   #2
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Basement Toilet Waste Line Issue


Rent a small jackhammer (or big hammer drill).
Open the floor to 6 or 8inches beyond the cast drain fittings.

If a flange can be set... OK.
If not open the floor more and replace the ell as well.

Fill the hole to support the pipe with DIRT; pack & tamp well.
Top the excavation with a couple inches of concrete.

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Old 06-27-2013, 10:57 AM   #3
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Basement Toilet Waste Line Issue


Sorry, i'm not following.

I can get the flange in there right now as it's a long compression flange from oatey. And it'll be at the proper height.
http://www.amazon.com/Oatey-43539-Fl...ef=pd_sim_hi_4

Are you saying I can just do that, backfill the hole, and then cement the last 1-2" around the closet flange since it'll be exposed at that point versus the pipe? Is cementing the flange in place like that appropriate? I just assumed not, but that's from a lack of toilet installation experience.
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Old 06-27-2013, 11:23 AM   #4
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Basement Toilet Waste Line Issue


Siivv.... See a current thread by Arsinik Called "What should I do to kill this gap in slab""... very close to your issue.

Just my opinion.... I'd fill the hole to your correct (flush floor/slab) height with either haydralic or vinyl cement (see discussion other thread).

Now you are different in that your compression coupling will be landing within that cement fill. You would not have much bond to your PVC fitting anyway, but to protect it for future replacement if ever necessary, I'd grease it or wrap in wax paper, before cementing it up.

Then you can set your setting screws into the new cement.

Best

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Old 06-27-2013, 11:30 AM   #5
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Basement Toilet Waste Line Issue


Quote:
Originally Posted by siivv View Post
Sorry, i'm not following.
Are you saying I (might be able to merely) backfill the hole, and then cement the last 1-2"
Yes. THEN set the flange.

I also suggest opening the hole wider first to really check that 50+ year old cast pipe and see how deep/wide the cavity is.

Last edited by TarheelTerp; 06-27-2013 at 11:54 AM.
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Old 06-27-2013, 01:02 PM   #6
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Basement Toilet Waste Line Issue


Thanks to both of you.
I will also take a look at the other thread - I must have missed it when searching for similar situations.

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