Living Roof Drainage

Residential homes may also have this type of commercial roof installed.

Living roof drainage.

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. This website based guide builds on the material and information in our original pdf the diy guide to green living roofs which we published in 2008. When the retention cups are at capacity water drains through the raised drainage holes through the drainage channels. Usually a roof slope of 40 degrees or more is required for runoff or else the living roof might end up in the home s living room.

The drainage also contributes to good aeration of the plant roots. Siphonic roof drain a siphonic roof drain utilizes siphoning as a drainage mechanism resulting in drainage that is faster than that on any other type of roof drain. A green roof typically begins with a layer of a water and rot proof membrane such as a heavy duty pond liner stretched across the area of a roof leading up to the gutters where drainage can run off. The drainage layer has an important role to play in the total system structure of a green roof.

It buffers water and allows excess water to drain away. Put large gravel or pebbles around the edge of the roof in the space you ve left this is to ensure drainage at the bottom and also stop the plants growing into the building 4. Inner drains are found many times on large building roofs. During a dry period the water stored can be reabsorbed by the vegetation layer above.

Greengrid is most effective on flat roof surfaces maximum slope of 1 12 using the largest continuous roof area. What is the best application for greengrid and or modular. The drains are usually placed near the center of the building. They attach to pipes that drain the water down through the building s roof.