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Stop leaks to the flat below: tile joints and floor sealed, or full membrane under new tiles.
Option one seals tile joints and floor with a penetrating chemical without breaking tiles. Option two removes tiles, applies a waterproof membrane with 1 ft upturn on walls and relays tiles. Materials are included; new tiles are extra.
A technician first checks where the water is coming from. Joint sealing takes one day; full membrane work 3–5 days, with a water-ponding test before tiling.