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I have a balcony with sealed tile. Water infiltrations damage the balcony, and the tiles start to peel off the edges. A craftsman advises removing the tile with the thin screed and redoing another screed with a new tile, while another craftsman proposes to directly stick the new tile on the old one. What do you recommend in this case? What solutions to "waterproof" to prevent new infiltration?

When tiling on a balcony starts to come off, do not worry stick a new tile on the old.
The proposal of the first craftsman, remove the tiles to start on a healthy basis, is to remember. This obviously requires a little more work, but it is the assurance that we will not have to start again in a few years. That the craftsman benefits for give a little more slope to the screed and therefore to carralage for better evacuation of water.

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