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Retention Roof Meander FKM 60

The economical green roof system with permanent water storage and run-off delay

For extensive and simply intensive green roofs with permanent water storage and runoff retardation, we recommend our RETENTION ROOF MEANDER FKM 60. The Meander water retention board FKM 60 is used as a drainage element. Part of the rainwater is permanently stored in it. At the same time, the outflow of the remaining rainwater is delayed, as it has to travel a longer flow path and is throttled at the outlet.

The Meander FKM 60 element thus ensures permanent water storage while at the same time delaying runoff and thus reducing the peak runoff coefficient. Permanent water storage and delayed water runoff in combination with biodiversity and evaporation make the Meander FKM 60 efficient a very high-performance product.

The permanent water storage of over 17 l/m² enables significantly more lush vegetation on the green roof. This contributes to an increase in biodiversity and an increase in evaporation capacity. This promotes cooling of the surrounding area, which in turn has a positive impact on the urban climate.

The RETENTION ROOF MEANDER FKM 60 is a mitigation measure within the framework of the impact compensation regulation and meets the requirements of the FLL Green Roof Guidelines.

Ecological value
Maintenance costs
Costs*from 30 €/m2

* Standard cost value for 1,000 m², net incl. installation, material varies from region to region.

System structure retention roof Meander FKM 60

Note: Click on the marked points to get more information!

Sedum sprouts and seed mix EKR

  • Proven and specially-balanced seed mix consisting of a wide range of herbs and grasses (as desired) as well as numerous types of sedum shoots
  • learn more: Seed mix EKR
  • learn more: Sedum sprouts

Extensive substrate E (60 mm)

  • A substrate with high water storage capacity and good air porosity, tailored to extensive multi layer systems.
  • learn more: Extensive substrate E

Filter fleece FIL 105

  • Prevents fine particles from forming sludge in the drainage layer
  • High water permeability
  • learn more: Filter fleece FIL 105

Meander water retention board FKM 60 (60 mm)

  • Delays discharge of surplus waster
  • Prevents accumulation of water
  • High level of water retention as well as good drainage performance
  • Reduction of required roof outlets
  • learn more: Meander water retention board FKM 60

Protection and storage fleece RMS 300

Complementary products

Optigrün Inspection Chamber FSK 37
  • Not included in the rendering
  • Simple control of the roof drains
  • Can be raised in 100 mm steps
  • Drainage openings at the side and top
  • learn more: Inspection Chamber FSK 37

Technical specifications

Weight*from 110 kg/m² or 1.1 kN/m²
Build-up depthfrom 120 mm
Roof pitch0-5°
Vegetation formherbs-grasses-sedum
Water retention50-70 %/year
Discharge coefficient**Cs = 0.17
Discharge yieldapprox. 32 l/m²
Water storagetotal 55-100 l/m²

* Depending on the load capacity of the substructure, Optigrün "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 Green Roof Guideline, the specified weight does not take temporary water accumulation into account.
** For the calculation of the dimensions of the pipe we recommend the discharge coefficient Cs = 0.1. Cs= 0.01 determined for 2 % according to the FLL Green Roof Guideline.