Economy Roof
Solution 2 (single-layered): 1-5°


  • Single-layered structure using the Optigreen Triangle Water Conduit System without a separate drainage layer.
  • 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.
Weight *100-140 kg/m² or 1.0-1.4 KN/m² *
Build-up depth80 mm
Roof pitch1-5° (0-9 %)
Vegetation formsedum-herbs-grasses
Water retention50-60 % 
Discharge coefficient **C=0.47-0.6
Water storageapprox. 25 l/m²
Discharge yield ***141-180 l/s x ha
Ecological value
Maintenance costs
Cost factor
*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.


  • Optigreen Hydro-Seeding uses a special germinating substrate and a finely tuned Seed Mix  A, consisting of numerous herbs (also grasses if desired) as well as various sedum shoots
  • Download Data Sheet

Optigreen Extensive Single Layer Substrate MKR
(80 mm) *

  • This substrate is specifically for extensive single layer systems with high water retention and good drainage
  • Download Data Sheet

Optigreen-Combi Inspection Chamber TKS Plus

  • For fast water drainage and distribution, consisting of Combi Inspection Chamber Plus and Water Conduit Profiles Plus
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  • Protects the roof membrane against damage and stores water.
  • For inverted roofs, use the Optigreen Trickle Protection Fleece RSV 120 instead of the RMS Fleece.
  • Download Data Sheet