Green Roof Drainage Plan

Green roof systems can be modular layered systems already prepared in trays including drainage layers growing media and plants or each component of the system can be installed separately on top of the structure.

Green roof drainage plan.

A green roof may require a separately plumbed secondary drainage system also known as the overflow relief system. A green roof may need to incorporate edge detailing around mechanical structures and should be. For flat or nearly flat roofs primary drains are located at the lowest point of the roof. Bauder sdf drainage layer material of the drainage layer polyamide monofilament weight of the drainage layer 400 g m.

The design of the different drainage layers allows for a portion of the stormwater to be retained above where the water is allowed to flow freely off of the roof. The systems are designed to ensure that stormwater can be used by plants for longer periods of time without oversaturation of the system. It is made of a filtration veil and the polyamide monofilament fibre network layer. Green roofs comprise a multi layered system that covers the roof of a building or podium structure with vegetation cover landscaping.

The green roof design needs to accommodate adequate water retention suitable drainage structural loading and the depth of green roof growing substrate. Flow of water into them is promoted by positive drainage. Drainage protection filtration layer it is used for lightweight green roofs terraces and has many functions. A major advantage of green roofs is the reduction of storm water runoff which leads to a decrease of the burden on sewer systems by 50 90 in summer depending on the green roof design and local climate.

As a rule of thumb a pitch under 10 degrees is normal for green roofs where a minimum fall of 1 60 can help encourage drainage. Your green roof design will depend on the roof your preferred green roof system as well as your desired build up and vegetation. Protection drainage and filtration. The roof can often be the space where major building systems are specified including for mep.

Green roofs have influence on cost reduction due to low or no need for raincatching cisterns and similar equipment which is usually used for.