Lightweight Roof
Solution 1: 0-5°


  • The lightest green roof solution available.
  • Erosion-proof system solution; can only be used with a secured waterproofing system. Not suitable for inverted roofs.
  • Can be used on roofs with zero degree drainage falls, subject to certain limitations.
  • Increased maintenance requirements and installation costs in comparison to an Economy Roof solution.
Weight *58 kg/m² or 0.58 KN/m² *
Build-up depth50 mm
Roof pitch0 - 5° (0 - 9 %)
Vegetation formmoss-sedum
Water retention40 - 50 %
Discharge coefficient **C=0.63 - 0.65
Water storageapprox. 18 l/m²
Ecological value
Maintenance costs
Cost factor **
*Weight specifications refer to saturated conditions; dry weight is approximately 50 - 60 % of the saturated weight.
**Depends on slope and system solution. Determined at 0° according to FLL guidelines.



Optigreen Vegetation Mat SM/G 20

  • Pre-cultivated sedum mat for the rapid establishment of vegetation in order to prevent wind erosion, with decomposable carrier
  • Productdetails: Vegetation Mat SM/G 20

Optigreen Low Density Substrate L 30 l/m²

  • Specially formulated substrate for single layer extensive roofs  featuring low weight but high water storage capacity.
  • Download Data Sheet

Optigreen Inspection Chamber LD

  • Simple control of root drainage outlets
  • Mounted onto the Optigreen Drainage and Storage Board FKD 25

Optigreen Drainage and Water Storage Element FKD 25 (25 mm)

  • Rapid discharge of surplus water
  • Prevents accumulation of water on non-pitched roofs and on large drainage runs
  • Good water storage capacity
  • Download Data Sheet