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allangee t1_jdrx9wo wrote

  1. Do you know what caused the settling in the first place, and have you remedied it? Otherwise, you'll be repeating the process.

  2. How do plan to fish down through one hole, past any gravel/fill, under the pipe, and then back up through gravel/fill to a relatively tiny hole?

  3. Is the pipe plastic? If it's cast iron, any strange stress could crack it. Or perhaps the pipe is already leaking somewhere causing the settling in the first place?

  4. If your basement is unfinished and you have clear access to the concrete, you can do most of the work on your own. (I've replaced entire sections of sewer pipe.) Get a saw and a couple of diamond blades -- a thrift store circular saw is ideal. Cut a line either side of the trench you need and break out the concrete. Raise the pipe and pack fill under it. Add a little rebar to the edges of the trench and fill it while also bringing up the floor to the correct level.

But again -- if you haven't figured out why it happened in the first place, it's likely to happen again.

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basic_hydronium OP t1_jdrzkal wrote

These are good questions, thanks.

  1. There’s never been water in my sump pump and no drainage issues around the house. No evidence on the sewer cam of a crack line and no evidence of a leak on my water supply. I’m on flat ground with substrate of primarily coarse river gravel. In short no clear cause. Two hypothesis are poor installation under the slab and there was a flood a few years back (prior to possession) that did not leak water into house but would have been close, could have washed away a little. Sewer inspection team with the city says they see this relatively commonly in my area, it usually doesn’t progress, usually installation related. So you’re right, could happen again but there’s nothing obvious to fix. I suppose it could be a crack in the sewer line we can’t see on camera, but would become obvious once poly fill.

  2. Tricky for sure. Plan was to drill 1.5 or 2 inch holes so there’s a little space. Pull out and loosen what you could immediately below the holes. The curvature of the hose clamp will want to hug the outside of the pipe and either hook it or powerful magnet on the other side to pull it back to surface. The pipe should be very close to the slab, it’s relatively close to the stack with relatively long way to go to the tie in and not a huge drop. In short the installation guys would need every inch they could get.

  3. plastic. Ran cameras through it, pipes looks fine as best you can tell from a sewer line. 4” ABS

  4. basement is finished, would prefer not to rip it up. I haven’t checked location of the line with a line finder, just best guess based on camera and tie in points. While the main part of the belly is down a hallway, the lateral from the second stack to the main is also slightly dipping and under my hot water tank and furnace. Would prefer not to be ripping everything out if I can solve more creatively. Breaking out and replacing a couple tiles is a lot less work than redoing a big chunk of the basement.

Thanks for your response. I’m seeing it a bit as a ‘no lose’. If it works I’m golden. If it doesn’t I have to cut into the slab anyway which is where I was at before

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allangee t1_jdtf77a wrote

I love the concept and the attempt. If you make a narrower adapter for a shop vac, you might be able to suck up some debris as you loosen it, if need be.

I would be thrilled to see this work for you. All the best!

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basic_hydronium OP t1_jdtgmsz wrote

Appreciate the comments and well wishes. Will report back if I give it a go!

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