Traditional multi-layered structure including drainage and filter fleece.
Particularly affordable roof greening.
Low maintenance requirement.
Comparably low biodiversity.
Generally suitable for the inverted roof; if applicable, minimum load for the wind up-lift protection has to be considered.
90-140 kg/m² or 0.9-1.4 KN/m²
0 – 5° (0 – 9 %)
50 – 60 %
Discharge coefficient **
C=0.47 - 0.6
approx. 25 l/m²
Discharge yield ***
141-180 l/s x ha
Depending on the load capacity of the substructure, Optigreen "High Density (HD)" or "Low Density (LD)" substrates can be used. Weight specifications refer to saturated conditions; dry weight is approximately 60 - 70 % of the saturated weight.
Depends on slope and system solution. Determined at 0° according to FLL guidelines.
Determined according to FLL discharge coefficient measurements using a 15-minute reference rainfall r(15) = 300 l/s x ha.