A 20 mm strong water-resistant cellular plastic is applied on top of the substructure. A Tensar La 30 fastening net with a grid size of 65 mm x 65 mm is installed on top of this. The Cellular plastic and the fixing net are attached to the substructure with a perforated steel strip and anchor bolts or, alternatively, with stainless (corrosion-resistant) screws. The plastic elements are then attached to the fastening net with cable ties in such a way that they are also attached to each other at the same time. This increases safety and thus provides a smooth sliding surface.