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I had to help a buddy dig a french drain system around his house. The little ranch was built on a 6" slab with the walls anchored directly into the concrete. Of course I have no idea how much rebar was in there supporting it. I would think if the floor has been there for a while then it should have sellted pretty good.
Ever thought about making it say 2 feet wider and just putting new post outside the slab concreted in, and then backfilling the concrete on the inside?
Hope all is going well!
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