Need more details. Slab atop slab? Slab adjacent to slab? New wall adjacent to new wall?
Old concrete clean and solid, or crumbly?
Options include drilling old & epoxying in rebar stubs, cutting "keyways" w diamond blade breaking and removing, and more.
Ht @Gormogonshttps://twitter.com/Based_Jedi/status/1151411801713721344 …
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3/ in standard stick-framing construction, you need to set "J bolts" into the concrete as it sets up, so that you can bolt down the 2x4 or 2x6 base board, to prevent uplift or shifting. Not sure what you'd do for you mode of construction.
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4/ best of luck!
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