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I want to build a wall to support a concrete slab. The starting floor is tiled. What should I do at the tiling level.

It is essential that you leave the bare ground, after removing the tiles where you plan to raise the wall: it is not possible to build a wall on the tiles, which of course, would crash under load. Warning: the construction of a wall in front of a concrete slab is in principle the responsibility of a professional, unless you have the skills in load calculation, dosing of concrete and reinforcement of it.

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