Flat Green Roof Drainage

A green roof may require a separately plumbed secondary drainage system also known as the overflow relief system.

Flat green roof drainage. Green roof solutions gr32 and gr52 drainage panels come in 24 x 24 interlocking squares constructed of 100 recycled high density polypropylene hdpp. The drainage of flat roofs is essential to drain off rain water and to protect the roof against moisture damage and warping. The gr52 can withstand 0 352 gallons per square foot or 1 4 gallons per panel. Zurn is proud to introduce its green roofing drain product line specifically suited for the unique needs of a green roof installation.

Dead and imposed loads should be calculated in accordance with bs en 1991 1 1 be en 1991 1 3 and bs en 1991 1 4 and should include the weight of the waterproofing system saturated weight of the green roof components and substrate vegetation snow loads and imposed loads such as access by people and vehicles as well as point loads for. There are a number of drainage options for flat roofs to combat ponding. For flat or nearly flat roofs primary drains are located at the lowest point of the roof. The most critical of these issues is the flat roof drainage systems.

Dallmer products are available for flat roofs of solid or lightweight construction and with a single or double ply membrane. A function of the drain layer is the application of a root resistant filter fabric. Your building and location can help determine which drain will fit your roof needs. Increasing the angle of a flat roof will always increase the speed of water movement across the surface.

These can be used on large flat roofs as well as residential. Flow of water into them is promoted by positive drainage. Secondary overflow drains are located at a higher point on the roof. Roof leveling compounds.

A rooftop garden or additional outside living space are the top reasons people choose flat roofs. The drainage layer is applied over the entire roof area. Having proper drainage on a green roof is a critical aspect of the system. Along with the benefits of a flat roof come unique challenges.

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. For a large roof it is recommended to have drains placed at multiple locations within the area of the roof.