The hollow floor consists of the underfloor (10) and the upper floor (15) resting on the underfloor via supporting feet (16). The underfloor has a continuous insulating layer (12) which is relatively soft and is covered by a relatively rigid pressure-distributing layer (13). The supporting feet (16) are supported on the pressure- distributing layer (13) and prevent local indentations in the insulating layer (12). The hollow floor exhibits very good thermal and acoustic insulation downwards. <IMAGE>
