Bathroom sub-floor causing tub to move and ABS pipes leak

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Posted by: from Pickering
4/7/2014 at 8:43:21 AM

I had a full bathroom renovation done 1 1/2 years ago in the main washroom with full tub install and tiles in shower area and new tile floor. Since that renovation the tub ABS pipes have leaked into the main floor ceiling 2 piece bathroom.

A contractor who did the initial work has replaced the ABS pipes so many times and has now advised that the sub'floor in the bathroom needs reinforcing. The contractor never mentioned anything about the sub-floor needing to be replaced or reinforced when he took on the full renovation of the 2nd storey bathroom.

Question? Is this any easy job to do to reinforce the bathroom sub-floor from down below through the 2 piece bathroom ceiling or would this need to be done through the renovated bathroom. The tub is surrounded by shower tiles, bathroom floor tiles and shower door installed.

Thank you,


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Mark from CMJ Renovations in Oakville
Date/Time4/7/2014 at 10:26:28 AM

Hi Deborah,

I am not sure what one has to do with the other. Leaking pipes (ABS) is the result of a bad connection either at the drain or with improper glue joining the pipes together, it has nothing to do with the floor or structure.

If the floor is moving because of the weight of water in the tub and a person etc then the issue is structural and it should have been dealt with during the reno. It can't be done from below which means the tub needs to be removed.

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Date/Time4/7/2014 at 10:34:21 AM

Hi Deborah,

Sorry to hear about your problems.

To answer your question, yes the repairs call be done from underneath the main bath-room.


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Date/Time4/7/2014 at 5:32:28 PM

It is very difficult to respond to your concerns with out seeing the proplem first hand.

The likely hood of a floor being unable to suport the weight of a tub is somewhat unlikely, as they are structurally engineered, unless completely rotted out. It is more likely that in an older house the foundation has shifted, pushing up the cast stack, or if ABS piping the expansion joint has bottomed out, before spending money on reconstructing the floor, I strongly recommend having a qualified plumber stick his head in and look at the plumbing stack. Estimates are usally free, and it would seem an easier solution.

With the spring melting the basement floors are likely to shift. Basement floors are build to float a little bit to accommodate the expantion of the soil under the wet conditions, under ground plumbing has less give, and may be pushing up finding the weekest piont, ie your tub. If this is the problem issues with the weeping tile could be a potential problem.

I hope this helps.

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Date/Time4/7/2014 at 7:57:41 PM

Like I say to all my costumers have solution for everything in life we just no have solution for the dead for all other PROBLEMS we have SOLUTION but first off all any job need been see in order to give accurate details


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