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Ask Machinc Your Own Question
Machinc, General Contractor
Category: Home Improvement
Satisfied Customers: 920
Experience:  Has written home improvement articles since 2008. Earned South Carolina Residential Builders License in 1991.
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I had a flood in basement with raw sewage and mold damage I

Customer Question

I had a flood in basement with raw sewage and mold damage I ripped everything out ..down to the concrete....theres is some plumbing underneath the concrete slab that might have some seepage in it which is still giving off really bad smell....if I seal
it off with a layer of cement and some sealant caulk will it be suffienct to contain the sewage I cant get to
Submitted: 2 years ago.
Category: Home Improvement
Customer: replied 2 years ago.
anyone there
Expert:  Machinc replied 2 years ago.

I will have your answer in a moment

Expert:  Machinc replied 2 years ago.
No i am sorry but that would not work.
Sealing with concrete would not block / repair the leak
you could wind up with a larger problem than you have now.
You need to try to trace the pipe and repair or replace it.
A professional plumber can run a camera into the pipe
and determine the extent of the damage and help locate
the pipe under the concrete.
The concrete will have to be broken with a jackhammer
to get to the pipe. Then It can be exposed and repaired.
Another possible option is to abandon the damaged pipe
and run a new one. It will take some amount of plumbing
experience to determine if this is feasible under your circumstances.
You may want to consult a professional plumber on this.
I will be glad to answer any questions you may have.
Customer: replied 2 years ago.
There is no leak in the pipe , its just from sewer back up there is sewage that we coudnt get to because the pipe is located under the concrete sub floor in the basement
Expert:  Machinc replied 2 years ago.
With no damage or leak to the pipe you just need to
find the feed to it .
The back up should not be able to get out
of the pipe so it must be going around the pipe and following the pipes exterior
under the concrete. When it backs up.
If you can find that area and seal it you can then
Cover any areas with new concrete.
Customer: replied 2 years ago.
it is around the pipe that still has the sewage , if i seal the opening will it solve the smell in the basement
Expert:  Machinc replied 2 years ago.
That is a good possibility.
You dont have a lot to loose by doing that .
If it doesn't work then you can move to the next step.
If it is overflowing and running into the crack and no leaks in the pipe
there is a good chance that would work.
I originally thought you had a broken pipe under the concrete
thus the original answer.
Expert:  Machinc replied 2 years ago.
If you have a toilet on the slab You might want to check the wax ring under it.
Flush and look for seepage around its base or odor around its base.