Next Day Delivery order before 2pm 
Order / Enquire Now
Call 020 8916 2222
Drainage
Protecto-Drain 20PG
Protecto-Drain 20mm Perforated + Geotextile
Key features include:
- 20mm dimples with a water storage capacity of approx. 6 l/m².
- High pressure resistance of approx. 150 kN/m² (~15 tonnes/m²).
- Exceptional drainage capacity (i = 1.00; approx. 8.54 l/s·m), suitable for large drainage lengths or low roof slopes
Pre-integrated geotextile
Wallbarn Protecto-Drain 20P Geo is a water-storing drainage membrane, ideal for both extensive and intensive green roofs. Compared to standard dimpled membranes, it offers significantly greater drainage and water storage capacity, serving as a protective, filtering, seepage, and water storage layer.
The geotextile is pre-integrated, allowing plant substrate to be applied directly, saving a work step. The perforation ensures permeability, making it suitable for inverted roofs by preventing water films on insulation.
For walkable, non-vegetated areas, the geotextile should be removed. The base layer and bedding material can then be applied directly to the membrane, ready for pavement or slab installation.