Outdoors, on terraces, balconies, pavements and tiled gardens, which are exposed to the weather, it is important to cancel the risk of water infiltration.The use of a draining layer between screed and waterproofing is recommended, all on a sloping substrate, in order to aid the flow of water while preserving the waterproofing layers over time.Durabase DD matting prevent water infiltration with consequent damage to the structure.