Drainage and Storage Board FKD 25

Optigrün Drainage and Storage Board FKD 25 is installed beneath single or multi-layered extensive green roofs with roof pitches of up to 5° or beneath pedestrian pathways in gravel beds without condensed support layers.

  • On flat roofs up to 5 % roof pitch
  • In a triple-layer structure with filter fleece FIL 105 and extensive multi-layer substrate E
  • Under thin-layer pedestrian pathways in gravel beds without bedding material
  • The large naps can face either downwards or upwards
  • Suitable for non-pitched roofs
  • Suitable for use on inverted roofs
  • With water reservoir
Material  Recycled HDPE
Nominal thickness approx. 25 mm
Grammage approx. 1,350 g/m2
Max. compressive strength unfilled
(DIN EN ISO 25619-2)
approx. 200 kN/m²
Water discharge capacity
(DIN EN ISO 12958)
1.41 l/(m*s) (at 2% roof pitch)