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Having proper drainage on a green roof is a critical aspect of the system. If the system is not able to drain properly it can negatively impact the vegetation due to over- saturation of the soil. As the soil takes on excessive amounts of water it continues to add weight to the roofing structure.

The drainage off a green roof surface is a particularly important component to maintain optimum growing conditions in the growth medium, to managing heavy rainfall without sustaining damage to growth media due to erosion or ponding of water, and to ensure the sound engineering and structural integrity of the roof.

The green roof drainage layer mats are the ideal roof drainage solution. This 3D mesh mat enables water to quickly drain and prevents pooling. Each drainage layer mat is applied over the rooftop surface and provides a protective layer that enables both drainage and breathability of roof membranes.

Green roofs have a layer of plant material that absorbs water like a sponge. They capture water when it rains, slowly releasing it through evaporation and plant use. Green roofs can significantly reduce the amount of rain water that would otherwise run off an impervious roof surface.

There are four main drainage material types used in green roof construction: cuspated sheets, entanglement sheets, granular material and structural drainage.