Green Roof Roof Drains

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.

Green roof roof drains.

The drainage layer has an important role to play in the total system structure of a green roof. 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. The most critical role of the drainage layer is to provide an adequate flow of water off the roof during and after rainfall.

During a dry period the water stored can be reabsorbed by the vegetation layer above. Z110 green roof drain shown with 18 height for intensive green roofing applications. Zurn manufactures a line of green roof drains featuring customizable enclosures to align with the green roof surface. Green roof drains watts unique designs are engineered to accommodate the fast emerging and often shifting requirements for green roof drainage.

Green roof solutions offers many different drainage layer options depending on system goals regarding water retention. Z110 green roof drains are available with enclosure heights ranging from 5 to 18 or as specified. Intensive layered green roof intensive green roofs have a deeper soil depth therefore the roof drain enclosure height is typically 12 or more.