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Can PVC slabs be placed on a deformed floor?

I would like to put PVC slabs in a house I just bought. Currently on the ground there are tiles with joints 4 mm wide and 2 deep. This is the ground floor on basement. The ground is not regular it forms like a vault with good unevenness in places. I was told that because of this the slabs would not hold. There is 80 m2 to do. Could you help me?

There is no question of lay PVC tiles, clip-on or collatable, on a deformed soil.
Two solutions are available to you:
- remove the tiles in place, and take back the soil structure to start on a healthy basis, for then lay a new tile;
- establish a dry screed and a paneling, on which you can put the coating you want, PVC tiles or other.

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