Can we remove a threshold of door about fifteen centimeters high, keeping the possibility of laying a new tile on an old? How many millimeters of height should we keep for future tiles? You should know that the house of 1980 has no crawl space, a pavement on sand with polyane sealing and thermal insulation polystyrene. Should there be additional insulation?
Taking into account the thickness of the adhesive and that of the tiles, it is necessary to envisage 10 mm reservation. We can even reduce this extra thickness by using a slim tile whose thickness will not exceed 4 mm. With the description of this construction, and of the mode of laying of the old tiling, it does not seem useful to provide a complementary insulation, whose result would be also a clear overthickness.
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