Water storing channel for e.g. garden plants, has coating made from polymers e.g. polyvinyl chloride, and supporting components arranged at edges of channel for stabilizing channel against compression, where channel is made from foam
The channel has a coating at its side, where the coating is made from polymers e.g. polyvinyl chloride, and has the thickness of about 1 mu m to 10 mm. Supporting components e.g. bars, are arranged at edges of the channel for stabilizing the channel against compression, where the channel is made from a melamine-formaldehyde foam and arranged as a layer between a building roof and a roof planting.