In order to keep the load on the roof surface as low as possible, special systems with a minimized layer structure, so-called "lightweight roofs", are required.
With a water-saturated weight of about 55kg/m³, it is lighter than a typical gravel roof with a structure of 5cm.
Image: System structure "lightweight roof"
A. Vegetation mat
B. Light substrate
C. Drainage and storage element
D. Separating, protective and storage fleece + roof waterproofing
E. Insulation
F. Vapor barrier
G. Supporting structure
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