Green Roof Roof Drains

The drainage layer has an important role to play in the total system structure of a green roof.

Green roof roof drains.

It buffers water and allows excess water to drain away. See the full list of features. Our flexible adaptable components can be configured to meet even the most challenging custom green roof specifications. Zurn manufactures a line of green roof drains featuring customizable enclosures to align with the green roof surface.

Intensive layered green roof intensive green roofs have a deeper soil depth therefore the roof drain enclosure height is typically 12 or more. The design of the different drainage layers allows for a portion of the stormwater to be retained above where the water is allowed to flow freely off of the roof. The most critical role of the drainage layer is to provide an adequate flow of water off the roof during and after rainfall. Green roof drains watts unique designs are engineered to accommodate the fast emerging and often shifting requirements for green roof drainage.

The drainage also contributes to good aeration of the plant roots. 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. During a dry period the water stored can be reabsorbed by the vegetation layer above.