The floor slab consists of at least one segment (1,2) as a double wall element, and the intermediate space (15) between the double walls and one or more sidewall elements in the join is uniformly filled with concrete. The double wall elements of the floor slab segments and sidewall segments (3) consist of a larger slab (4) for the outer side of the storey and a smaller slab (5) for the inner side. The respective larger slabs bear one upon the other and the smaller slabs similarly bear one upon the other. The building storey has a floor slab and at least one side wall segment as a double wall element fixed to the edge of the floor slab.
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