Retention Roof
Meander FKM 30

Characteristics

  • System solutions with defined water retention
  • High level of reduction of of water discharge during high intensity rainfall whilst retaining good drainage (even for large roof areas)
  • Peak discharge
  • Discharge coefficient Cs (according to FLL): 0.01 - 0.17 at 2° roof pitch
  • Water storage and discharge delay.
  • Suitable for blue roofs
  • For green and gravel roofs
Weight *90 kg/m² or 0.9 KN/m² *
Build-up depth90 mm
Roof pitch0-5° (0-9 %)
Vegetation formsedum-moss
Water retention50 %
Discharge coefficientCs=0.01 **
Discharge yield ***3 l/s x ha
Water storageapprox. 21 l/m² -40 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.
**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 guideline.
***Determined according to FLL discharge coefficient measurements using a 15-minute reference rainfall r(15) = 300 l/s x ha.

PERENNIAL PLANTS AND/OR OPTIGREEN SEED MIX EKR AND SEDUM SHOOTS

  • 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
  • Perennials in roof substrate pre-cultivated
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OPTIGREEN EXTENSIVE SUBSTRATE E
(60 MM) *

  • A substrate with high water storage capacity and good air porosity, tailored to extensive multi layer systems
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OPTIGREEN COMBI INSPECTION CHAMBER TKS PLUS (NOT SHOWN IN THE DRAWING)

  • Simple control of roof drainage outlets
  • Extendable in 100 mm increments
  • Side and top drainage openings
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OPTIGREEN FILTER FLEECE FIL 105

  • Prevents fine particles from forming sludge in the drainage layer; high water permeability.
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Optigreen 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
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OPTIGREEN PROTECTION AND STORAGE FLEECE RMS 300