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.

Drainage and water retention element. Vegetation that does not like anaerobic conditions can be killed off. Flow of water into them is promoted by positive drainage. It can be used for light planted roofs.

The most critical role of the drainage layer is to provide an adequate flow of water off the roof during and after rainfall. They have to be mounted linked to each other and floating over the protective layer of the waterproofing. Green roof drains watts unique designs are engineered to accommodate the fast emerging and often shifting requirements for green roof drainage. Lack of water is one of the biggest stresses on a green roof.

Xf drainage mats are engineered to divert excess water from the green roof quickly for healthy plant growth. However too much water on a roof can cause a number of serious issues. For flat or nearly flat roofs primary drains are located at the lowest point of the roof. A green roof may require a separately plumbed secondary drainage system also known as the overflow relief system.

Water retention and drainage board. 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. Together they form the drainage layer of the extensive green roof. Benefits of green roof.

These elements have low retention capacity. Green roof solutions offers many different drainage layer options depending on system goals regarding water retention. This roof ponding repair kit can be topcoated with all commonly used roof coatings to waterproof a flat roof. Greenslope is a roof leveling compound that helps eliminate water ponding areas and facilitate flat roof drainage.

How to drain the roof. Note that there was very little if any runoff during the may 1 to sept 30 growing season. 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. 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.