Trafficked areas on flat roofs with a waterproofing layer at zero falls require specially adapted designs. standing water on the waterproofing or insulation layer must be separated from the base and bedding layers by means of suitable drainage systems.
Base layer of gravel 0-32 mm or 0-45 mm (0-22 on heights less than 120 mm)
Filter Fleece FIL 300
Prevents fine particles from forming sludge in the drainage layer; high water permeability, very high robustness class GRC 5 Productdetails: Filtervlies FIL 300
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