Leaking sewage stack embedded in wall


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Old 05-23-16, 09:03 PM
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Leaking sewage stack embedded in wall

Hey folks,

I have a leaking sewage stack that is embedded in my kitchen wall. The only giveaway is the cracked plaster around it. The picture doesn't show it very well, but there are vertical cracks inline with the stack both above and below the join which is barely showing. The stack services our 2nd floor bathroom only, which is not currently in use, but soon will be. The house was built in 1900, so the pipes are pretty old.
I am seeking advice on how to fix this issue in the most reasonable manner.
The biggest obstacle here is the potential necessity of removing the counter/cabinet space and radiator in front of the stack in order to get to it if required. However, it appears that the affected (cracked, rusted, whatever) area is above the join. The plaster below cracked due to the seepage downward, at least that's my hope.
My current plan is to excavate the pipe from the ceiling down to the counter top. If everything below the join looks ok, I'll just replace that section. The problem is, I'm not sure if it would be better to just go all out and replace the whole thing (really dont want to), or just the eroded section and hope the rest doesn't follow suite while I still own the house (have no plans on leaving at the moment).

Also not sure if PVC is a good replacement in this case since it will be embedded in plaster.

Any thoughts on best practices, methods of repair, etc are welcome.

Thanks in advance.
 
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Old 05-24-16, 01:39 AM
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Are you sure that it's the sewage pipe & not a steam riser? I see a steam radiator there. Is the outside wall brick like the neighbor's house or is that fake brick siding?
 
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Old 05-24-16, 06:48 AM
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Hi Pulpo,

Thanks for your response. To answer your questions, the radiator is definitely hot water, not steam. The brick is real brick.
The radiator pipes that feed upstairs are in a different location, and so are the water feeds for the bathroom above in case you were wondering. The only pipe in the wall at the location in question is the sewage stack.
I tested to make certain it was the sewage stack by flushing the toilet and running water in the bath and sink above, each separately (to rule out the possibility of only one of them being the culprit and not the main stack. All of them cause leakage though.
 
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Old 05-24-16, 07:12 AM
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Based on that info, open the ceiling & the wall as you mentioned before. See what's there & let us know.
 
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Old 05-24-16, 08:22 PM
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Ok, so I opened up the wall and the ceiling. The section of pipe above the joint mentioned previously is visibly disintegrating, and tapping on the length below the joint sounds weak.
Above the ceiling is a 90 off the original stack feeding new work. The original stack then continues straight up the wall (embedded in it) and out the roof.
A visual inspection of the stack above the roof looks ok to me, but I have no idea of its integrity below the roof line to the 90 below it.

The stack terminates to new pvc in the basement.

My options, so far as I can tell, are to either replace the whole stack from basement to roof, or from basement to the 90 in the ceiling and hope that the pipe above it is ok (and will be for a long time coming).

I guess my biggest question is, if you need to remove a vertical stack that is embedded in a wall, is it possible to work it out of there without opening a channel in the wall the full length of the run? What is standard practice here?

Another possibility I thought of: The original pipe is 4". Is it possible to run 3" pvc inside the original pipe and eliminate the need for removal (except for the section that would have to be removed in order to connect the bathroom feeds)?

Again, any help would be appreciated here.

Thanks,

Rob
 
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Old 05-25-16, 07:34 AM
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Going back to the possibility of leaving the vent stack above the 90 in the ceiling intact, I'm curious about the likelihood of it having a high integrity since nothing drains into it from above. It acts only as a vent at this level, and should have remained rather dry throughout its life in comparison to the soil stack portion below it.
Does anyone have an experienced opinion regarding this possibility?

Thanks again,

Rob
 
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Old 05-25-16, 08:37 AM
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Going back to the possibility of leaving the vent stack above the 90 in the ceiling intact,
I'll add a caution. Be sure it is well fastened above where you cut if you do that or it might drop down.
 
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Old 05-25-16, 09:35 AM
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Point taken, Ray. Thank you .
 
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Old 05-25-16, 09:11 PM
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Boot from cast iron tee to pvc?

I decided to leave the vent stack and the tee above the ceiling intact, and just removed all the pipe below that. Unfortunately, the pipe was cracked all the way up to the tee, and the end of the pipe is still inside the tee, but flush with the fitting.
My question now is, is it absolutely necessary to clear the tee of the pipe remnants, or can you just span a boot over the tee to the new pvc pipe?
 
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Old 05-27-16, 06:52 AM
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I thought I'd tie this thread up in case anyone is looking for a solution to a similar situation.

Making the connection from the 4" cast iron tee to the 4" pvc was done using a rubber adapter. I had stopped into a local plumbing supply shop and that was their recommendation. It slips right over the cast iron bell and directly onto the pvc pipe. Smearing laundry detergent inside the fitting was also recommended for an easier fit, and that worked great.

Anyway, no leaks. All good.

Thank folks!

Here are some pictures.
 
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