Living Roof Drainage

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

Living roof drainage.

Inner drains are found many times on large building roofs. The drainage layer has an important role to play in the total system structure of a green roof. 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.

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