Retention Roof - Flow Control Intensive

A retention roof flow control solution is suitable for intensive green roofs where there are special structural requirements with regard to flooding volume and runoff retardation. The Water Retention Box (WRB) is used as the water storage and drainage element. Depending on the requirements, the WRB element can be used for permanent water storage and/or as a temporary retention chamber for outflow delay. 

Features and benefits:

• Very low outflow rate, thanks to a specifically adjusted flow control unit.
• Very high retention volume in the WRB 85 – approx. 80 l/m².
• Lightweight thanks to hollow-body drainage unit (WRB Water Retention Box).
• High evaporation capacity thanks to integrated capillary system.
• Very high compressive strength.
• Basic prerequisite: 0° roof.
• Suitable for inverted roofs.
• Also available as a public roof.
• Fulfils the requirements of the FLL Green Roof Guidelines.