rasengitterstein

摘要

The present invention relates to a from a heap porous concrete, grating stone (1) for origin surfaces which can be applied in the garden - and landscape architecture. The grating stone (1) according to the invention is characterized in that it consists of at least two superposed concrete layers (s1, s2) is constructed in different porosity, in which case the lower layer (s2) two superposed layers has a lower porosity than the respective upper layer (s1).