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We had a builder pour a levelling concrete layer because we broke down a wall between kitchen an living room, and generally the concrete was uneven - it's pretty flat, but there are a few places where you can still feel unevenness due to the tiles moving when you walk on them.
The tiles are "floating" and are put together on top of a plastic sheet to prevent moisture coming through, so in that regard, I think you'd be good.
MisterMikkel
Thanks - how flat/perfect was your substrate?
Ours is far from perfect which is probably what's put me off in the past.
We've also got a leak we can't get access coming from next door who are unwilling to do anything about it. It's very small (a damp patch in a corner that projects about 5cm from the wall - never spreads further) but I imagine it'd wreck the adhesive in that corner and would be upsetting for everyone involved.