Garden Roof
Solution 1 (with Drainage Board): 0-5°


  • Multi-layered construction design with drainage board.
  • Intensive roof greening.
  • Additional living space thanks to the usable roof landscape.
  • Perennial beds, recreational lawns, shrubbery, ponds and seating areas etc.
  • Automatic irrigation possible.
  • Urban Farming.
  • Inverted roof: Suitable with Drainage Board FKD 60 BO and Drainage Board FKD 60 BU.
Weight320-680 kg/m² or 3.2-6.8 KN/m² * 
Build-up depth260-470 mm
Roof pitch0–5° (0–9 %)
Vegetation formperennial plants-shrubs-trees-lawn areas
Water retention70-95 %
Discharge coefficientCs=0.2
Water storageapprox. 110-160 l/m²
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. In accordance with the requirements of the FLL guideline, the specified weight does not take temporary water accumulation into account.



Optigreen Intensive Substrate i (230 – 330 mm)
Alternative: Optigreen Lawn Substrate R (200 – 300mm)

Optigreen Filter Fleece FIL 105

  • Prevents fine particles from forming sludge in the drainage layer; high water permeability

Optigreen Drainage and Storage Element FKD 60BO (60 mm)

  • High water storage capacity
  • Prevents accumulation of water on roofs with 0° drainage falls and long drainage runs
  • Lightweight build-up with high drainage capacity and good drainage performance
  • Filled with Perl drainage material
  • Download Data Sheet 60BO
  • Download Data Sheet Perl 8/16

Optigreen Combi Inspection Chamber TKS Plus (patented)
(not shown in the drawing)

  • Simple control of roof drainage outlets
  • Extendable in 100 mm increments
  • Side and top drainage openings
  • Download Data Sheet


  • Protects root barrier membrane or roof membrane against damage and stores water
  • For higher mechanical demands: Optigreen Protection and Storage Fleece RMS 900 resp. 1200
  • Download Data Sheet