GREEN ROOF SYSTEM OPTIGRÜN-SOLAR FKM
The Optigrün-Solar FKM roof greening system is a load-bearing elevation for the roof-penetration-free mounting of PV modules or PV module rows. The versatile substructure makes it possible to mount almost all PV modules with inclinations of 10°, 15° or 20°.
The module rows can be laid in a south or east-west orientation. The modules can be mounted both vertically (portrait) and horizontally (landscape). Optigrün-Solar FKM is the system solution for extensive solar green roofs where a very low peak runoff coefficient is required. Thanks to the Meander FKM 30 drainage element, the rainwater has to cover a longer flow path and is also throttled at the outlet. This ensures a significant reduction in the peak discharge coefficient.
With the combination of load-bearing elevation and Meander FKM 30 drainage elements, Optigrün-Solar FKM is an economical and efficient system for runoff retention and sustainable power generation with solar energy.
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* For 1,000 m², net, material (base plate, bracket, rail system) incl. installation, without PV modules.
** Green roof guide prices for 1,000 m², net, incl. installation, material varies from region to region.
Meander - modelled on nature
Meanders are natural river formations that result from the turbulence of water. Instead of moving exclusively along the actual current, the river forms small whirlpools that grind the bank in a round shape against the actual direction of flow. Over time, S-loops are formed in which the water moves. This increases the flow length and reduces the flow speed.
Good green roof design is close to nature: in retention roof construction, the meander shape of the water and retention elements enables the delayed drainage of water. Thanks to the S-loops, the water never flows in a straight line, but on winding detours, which effectively reduces runoff peaks.
System structure Optigrün-Solar FKM
Note: Click on the marked points to get more information!
Photovoltaic Module
Manufacturer as selected
Solar Mounting Frame Solar FKD
- Load-supported solar mounting system consisting of base plate and mounting frame with associated easy mounting rails and module clamps
Sedum Vegetation
- Sedum planting with several species using vegetation mat, plug plants or sedum cuttings
- learn more: Sedum sprouts
Extensive Substrate
- Substrate tailored to the specification
Filter Fleece FIL 105
- Prevents fine particles from being washed into the drainage layer
- High water permeability
- Learn more: Filter Fleece FIL 105
Drainage and Storage Board FKD 25MA
- With large water reservoir and optimum water distribution
- Learn more: Drainage and Storage Board FKD 25
Protection and Storage Fleece RMS 300
- Protects the roof membrane against damage and stores water.
- For inverted roofs, use the Optigrün Trickle Protection Fleece RSV 120 instead of the RMS Fleece.
- learn more: Protection and Storage Fleece RMS 300
Meander Water Retention Board FKM 30 (30 mm)
- Delays discharge of surplus water
- Prevents accumulation of water
- Lighter build-up with better drainage performance
- Temporary water storage only
- learn more: Meander Water Retention Board FKM 30
Complementary products
Technical specifications
| Weight* | from 115 kg/m² or 1.15 kN/m² |
| Build-up depth | from 120 mm |
| Roof pitch | 0-5° |
| Vegetation form | Sedum |
| Water retention | 50-70 %/year |
| Discharge coefficient** | Cs = 0.01 |
| Water storage | from approx. 54 l/m² |
* In accordance with the requirements of the FLL green roof guidelines, temporary water retention is not taken into account in the weights stated.
** Determined at 0 and 2 % roof pitch in accordance with the FLL method and with different substrate heights. A peak runoff coefficient of Cs≤0.1 should be used for the drainage design. As the slabs must be cut to size during installation, the test value should not be used to design the drainage.
*** Water storage capacity in all layers of the system structure (drainage element incl. temporary water storage, filter layer, substrate and vegetation. Excl. water storage in the protective layer).
