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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Great info! The foundation walls are all curved (as if it wasn't a crazy enough build), so I was going to find some flexible plywood to make curved forms. And thanks! I'll need it.
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you can make your own curved / flexible plywood ! Set your circular saw to a depth of about 1/2 or 1/3 of the plwood thickness, and run score lines this lowers the strength of plywood, of course, so you might want to double it up with a second layer, likewise scored
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