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Retention roof Contec.retention

Contec.retention stands for water accumulation or the retention of specified amounts of water.

Instead of expensive retention basins, right on the flat roof break the peak runoff during heavy rain events or retain the water on the roof. The choice is yours.

Contec.retention throttle - water accumulation

With the system Contec.retention throttle you accumulate water on the roof or on traffic roofs. It is suitable for slope-free extensive and intensive green roofs.


  • Low weight
  • Increased evaporation capacity
  • High ecological value
  • Relief of the sewerage system
  • Easy to install
  • Great freedom of design for the structure


  • Material: Recycled HDPE or recycled PP reclaimed material
  • Color: Black
  • Nominal thickness: 30 mm - 150 mm
  • Weight: Approx. 3.6 - 12 kg/ m2
  • Water storage: Approx. 80 - 140 l/ m2

Contec.retention meander - discharge delay

With Contec.retention meanders you either achieve a delay in runoff or retain the water. This system is for extensive green roofs or for gravel roofs.


  • Top values of the runoff coefficient
  • Low structure height
  • Delayed water drainage during heavy rainfall events
  • Easy to install
  • Excellent values

Facts on Contec.retention Meander 30

  • Material: Recycled HDPE
  • Color: Black
  • Nominal thickness: 30 mm
  • Weight: 1.7 kg/m2
  • Water storage: 21 - 40 l/m2
  • Peak discharge coefficient: Cs = From 0.01
  • Flow distance: From up to 46 m

Facts on Contec.retention Meander 60

  • Material: Recycled PP Regenerate
  • Color: Black
  • Nominal thickness: 60 mm
  • Weight: 2.8 kg/m2
  • Water storage: 38 - 53 l/ m2
  • Peak discharge coefficient: Cs = From 0.05
  • Flow distance: Is extended by 13 times