If the tiles are being removed due to one or two being cracked or damaged, it may be advisable to replace the damaged tiles, see Replacing a damaged ceramic tile for more details.
If the surface is going to be re-tiled, it may prove easier to tile over the original tiles. Old, firm, established tiling is a good surface to tile over. Remove all ‘furniture’ before commencing. Check that the extra thickness doesn’t interfere with any fittings already in place.
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