Living Roof Drainage

When the retention cups are at capacity water drains through the raised drainage holes through the drainage channels.

Living roof drainage.

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. This online guide is designed to meet the needs of diy enthusiasts looking to put a green roof on a shed or outhouse builders and landscaper contractors who want to build green roofs. 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. Residential homes may also have this type of commercial roof installed.

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. What is the best application for greengrid and or modular. The most critical role of the drainage layer is to provide an adequate flow of water off the roof during and after rainfall. Commonly used on flat commercial roofs siphonic drains allow for a minimal number of drains and all of the drains can be connected to a single leader.

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. It buffers water and allows excess water to drain away. They attach to pipes that drain the water down through the building s roof. The drainage also contributes to good aeration of the plant roots.

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. Greengrid is most effective on flat roof surfaces maximum slope of 1 12 using the largest continuous roof area. 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.