shelf floors (10) for mounting walls in humid rooms, in particular in bathrooms, shower rooms or the like, with multi-layered structure, the shelf floors being at least one first layer (11) and one second layer (12) of at least one tile (24) and one between the first and second layers (11, (12) an arranged layer (13) consists of the layers (11, 12, 13) being bonded to each other, the base of the shelf being fixed to two adjacent walls by means of a compound, in a material-like manner, on a corner of a moisture chamber;where the adjuvant for fixing the shelf base is located at least on two sides (15) of the filling layer.
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