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@bq
I'm laying a plywood subfloor (8-10mm) for tiling over, and the floor underneath is not flat and level. I was thinking that the easiest and best way of making it so, thus preventing the plywood from bouncing over any dips, would be to put a layer of self levelling or concrete under the ply and then squish it down, allowing any excess concrete to squidge out.
Is this mental?
Would the concrete dry OK under a plywood sheet?