Green Roof Water Drainage

Sub surface run off must drain efficiently from the substrate into the drainage layer off the roof.

Green roof water drainage.

One of the main concerns that small scale builders have outlined to us is how to drain the roof. These elements have low retention capacity. Figure 2 shows the daily rain and associated daily green roof runoff for 1993 in state college pa for a green roof having a maximum of 1 6 inches of water retention storage. For flat or nearly flat roofs primary drains are located at the lowest point of the roof.

Flow of water into them is promoted by positive drainage. Green roof solutions offers many different drainage layer options depending on system goals regarding water retention. The most critical role of the drainage layer is to provide an adequate flow of water off the roof during and after rainfall. It can be used for light planted roofs.

Drainage and water retention element. Water retention and drainage board. Xf drainage mats are engineered to divert excess water from the green roof quickly for healthy plant growth. Together they form the drainage layer of the extensive green roof.

Good drainage is criticalfor green roofs and ensures that large amounts of water are not retained on the roof compromising both the structural integrity of the building and plant health through waterlogging and oxygen depleted substrates. However too much water on a roof can cause a number of serious issues. Vegetation that does not like anaerobic conditions can be killed off. Green roof drains watts unique designs are engineered to accommodate the fast emerging and often shifting requirements for green roof drainage.

Greenslope is a roof leveling compound that helps eliminate water ponding areas and facilitate flat roof drainage. Note that there was very little if any runoff during the may 1 to sept 30 growing season. How to drain the roof. Allows rainwater to water vegetation in green roofs without waterlogging the plant xf is highly permeable geo composites that combine drainage filter aeration and water retention functions in one product.

They have to be mounted linked to each other and floating over the protective layer of the waterproofing. Our flexible adaptable components can be configured to meet even the most challenging custom green roof specifications. Lack of water is one of the biggest stresses on a green roof. Diadrain 60h up water retention and drainage board.