Flat Green Roof Drainage

Along with the benefits of a flat roof come unique challenges.

Flat green roof drainage.

For a large roof it is recommended to have drains placed at multiple locations within the area of the roof. The drainage layer is applied over the entire roof area. It forms an extremely stable and pressure resistant sub base and sometimes serves as an additional thermal air layer. A green roof may require a separately plumbed secondary drainage system also known as the overflow relief system.

Increasing the angle of a flat roof will always increase the speed of water movement across the surface. The grs gr52 panel size is 24 x 24 x 2 125. The most critical of these issues is the flat roof drainage systems. A function of the drain layer is the application of a root resistant filter fabric.

Roof leveling compounds. Flow of water into them is promoted by positive drainage. Inner drains are located in central areas of the roof and are connected to pipes underneath the roof that drain the water to a sewer. There are a number of drainage options for flat roofs to combat ponding.

These can be used on large flat roofs as well as residential. Zurn is proud to introduce its green roofing drain product line specifically suited for the unique needs of a green roof installation. Your building and location can help determine which drain will fit your roof needs. The gr52 can withstand 0 352 gallons per square foot or 1 4 gallons per panel.

Secondary overflow drains are located at a higher point on the roof. A rooftop garden or additional outside living space are the top reasons people choose flat roofs. Dallmer products are available for flat roofs of solid or lightweight construction and with a single or double ply membrane. Having proper drainage on a green roof is a critical aspect of the system.

Green roof solutions gr32 and gr52 drainage panels come in 24 x 24 interlocking squares constructed of 100 recycled high density polypropylene hdpp. For flat or nearly flat roofs primary drains are located at the lowest point of the roof.