LAYING PLATE FOR USEFUL SURFACES
The invention relates to a laying plate for useful surfaces, comprising a grille or honeycomb plate (2) made of plastic, having a perimetric outer frame (4) having frame walls (5), having coupling devices (8, 11) on the outside of the frame walls, and having inner support walls (13), which provide the plate interior with grille or honeycomb openings (14) and which form the grille or honeycomb structure. It is essential that a barrier layer (3) permeable to water yet impermeable to fine filling material is or can be fastened to the underside contact surface (12) of the grille plate (2) so as to completely cover said contact surface. Thus, fine material such as fine gravel or sand can no longer migrate or be drawn downward into the subsurface.