Green Roof Drainage Plan

Drainage protection filtration layer it is used for lightweight green roofs terraces and has many functions.

Green roof drainage plan.

Protection drainage and filtration. Flow of water into them is promoted by positive drainage. Bauder sdf drainage layer material of the drainage layer polyamide monofilament weight of the drainage layer 400 g m. 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.

Green roof systems can be shallow typically referred to as extensive or deep typically referred to as intensive. 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. 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. A green roof may require a separately plumbed secondary drainage system also known as the overflow relief system.

Green roof design. Green roofs have influence on cost reduction due to low or no need for raincatching cisterns and similar equipment which is usually used for. Green roofs comprise a multi layered system that covers the roof of a building or podium structure with vegetation cover landscaping. The roof can often be the space where major building systems are specified including for mep.

For flat or nearly flat roofs primary drains are located at the lowest point of the roof. 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. It is made of a filtration veil and the polyamide monofilament fibre network layer. The roof is likely to consist of an impermeable layer a susbstrate or growing medium and a drainage layer although not all green roofs require a drainage layer.

Your green roof design will depend on the roof your preferred green roof system as well as your desired build up and vegetation.