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Plumbing Nightmare in New Barn
Cutter, Tom's comments are bang on. Do NOT let them attempt some 'easy fix', this situation is a MAJOR problem. The drain will let fluids out with some standing 'water' remaining, however, I would be very surprised if that lasted very long since the shallow rise section will undoubtedly act as a sediment trap, clogging the drain in short order. As Craig mentioned the only way to fix this problem is to open a section of the floor and REPLACE the pipe. Do NOT let them tunnel beneath the slab, it will be impossible to compact the soil properly afterwards and will cause settling of the slab, probably after the 'warranty' on their work expires, you do not want to inherit someone elses problem a couple of years down the road. In fact if it was me (who is a P. Eng.) I would insist that the repairs be done to the satisfaction of an Engineer, and then be certifed, this will guarantee (literally) that it is done right. Best of luck.
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Plumbing Nightmare in New Barn
Cutter, while Sparky's suggestion is correct, this problem COULD be fixed using slurry pumped in, the problem is guaranteeing the fix. I suspect that while your contractor is no doubt competant as a builder (accident aside) I doubt they have ever even seen this process, much less be experienced at it. Underpinning of this type is a tricky process for someone skilled at it, for a novice to get it right the first time, well lets just say you'd be better off buying lottery tickets in hopes of having enough money to rip up and redo the slab. The problem with this method in your case is two-fold, first, filling a horizontal hole is VERY tricky and voids left behind will be a problem later on, and secondly, if it is not done right you will not know till much later. These two reasons are why I suggested that NO repair be done UNLESS it is recomended and certified (in writing of course) by a Licenced Engineer, that way any problem later on will be covered by their liability insurance. I doubt that you could disagree with this building of yours being too big an investment on your part to gamble with. Even if the builder is not willing to pay for the cost of an Engineer, do it out of your own pocket, it shouldn't cost more than a couple hundred dollars and it may be the best money you will spend on that building. Best of luck.
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Plumbing Nightmare in New Barn
Rob, interesting how different liability issues are between countries, here in Canada, "coughing up dough" is not optional, all someone has to do is contact the Association of Professional Engineers and they will tell you put you in touch with an adjuster for the insurance carrier. If a claim is deemed to be covered (and almost all are) they will fix the problem with their contractor and then go after the Engineer for the $5,000 deductable on the liability policy. Also, an Engineers certification is binding regardless if he was NEVER even on-site. This is why I don't practice. On the other hand medical malpractice is almost impossible to do anything about in Canada unless it is a major problem.
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