The RDL edging element can be used to separate different materials (eg, separating crushed gravel from planting) or for enclosing areas of the roof. Ideal for all types of green roofs, as they are manufactured in different heights, and can be customized to suit the needs of each project. It is placed on the drainage network so as to facilitate runoff, while inside it has transverse cut-out slots in the interior to remove water circulating above the drainage network in the event of heavy rainfall. The design and robustness of the edging element prevents it from being displaced by lateral pressures.