The main task of the drainage layer is to drain the surface water seeping through from above to the roof drains. In addition, depending on the formation and layer structure, the drainage layer can also serve as a water storage layer or to enlarge the root area. The drainage layer can consist of profiled or studded panels made of plastic or rubber, but also of bulk materials such as gravel, chippings, lava or expanded clay or special foam or textured fleece mats.
Source: bauwion
Lightweight materials are usually used for drainage on roof surfaces. Drain mats, plates and elements made of plastic are often used. Alternatively, fills can also be used. These consist of lava or expanded clay, for example.
Drainage (also drainage / drainage) are measures and systems that capture water on and around buildings and drain it away in a targeted manner. They are available in the form of drainage mats, pipes and entire systems. Nonwovens act as filters and prevent fine particles from the soil from penetrating into the drainage layer. This creates filter stability. Surface drainage consists of filter-stable geotextiles and a capillary-breaking gravel layer with a grain size of 8/16.
of drain layers ensure that areas of 400m² with a gradient of 2% are perfectly drained.
Drain elements made of rigid foam may be counted as additional thermal insulation.
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