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.
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.
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.