20-150 / DRAINAGE MEMBRANE

Advantages:

• Compared to normal dimpled membranes, 20-150 membrane offers many times the drainage and water storage capacity and assumes the function of a protective and water storage layer in green roofs
• The 20 mm dimples have a water storage capacity of approx. 6 L/m²
• The pressure resistance of approx. 150 kN/m² offers a high level of security, corresponding to a compressive strength of approx. 15 tonnes per m²
• The 20 mm dimpled membrane also offers an unusually high drainage capacity of i = 1,00; approx. 8,54 L/s·m
• It can therefore also be used for very large drainage lengths and/or very low roof slopes
• The plant substrate can be applied directly on the dimpled membrane after laying a separate geotextile
• Thanks to the perforation, the water-storing drainage membrane is permeable and can also be used for inverted roofs. This prevents a film of water from forming on the inverted roof insulation
• In walkable areas without vegetation, no geotextile is used. The base layer and the bedding material can then be applied directly on the dimpled membrane without changing the material, and then the pavement or slab covering can be laid on top of it

Installation:

• The waterproofed surface must thoroughly cleaned so that no damage can occur to the waterproofing after laying the drainage membrane
• Lay a geotextile as a protective and separating layer with at least 300 g/m2 on the waterproofing. The membrane 20-150 is laid horizontally with the dimples to the surface by rolling it out, with the dimple openings facing upwards
• The dimpled membranes are overlapped by 10 cm (two rows of dimples)
• The dimpled membrane can be cut to the required length with a knife, but do not damage the waterproofing
• If the laid membranes have to be extended, the connecting membrane is pushed under at least 20 cm from below
• The horizontal overlaps must be shingle-like in the direction of the waterflow
• On rising components, the drainage membrane 20-150 should be raised at least 10 cm (2 rows of dimples). The drainage membranes are laid step by step
• Then install a geotextile as a filter layer over the entire laid surface. The plant substrate can then be applied directly