Green Roof Granular Drainage

Systems with granular drainage description.

Green roof granular drainage.

Green roof drain boxes optigreen drain boxes prevent soil and granular drainage media from entering roof drains but allow water to flow freely through slots covering the sides and top. Compared with green roofs systems using drainage plates or granular drainage this system is the fastest to install and creates the thinnest and lightest green roof assembly. Green roof solutions gr32 and gr52 drainage panels come in 24 x 24 interlocking squares constructed of 100 recycled high density polypropylene hdpp. Description green roof systems of this type are drained by waffled plastic sheets called drainage plates.

The grs gr52 panel size is 24 x 24 x 2 125. Green roof systems of this type are drained by a base layer of lightweight inorganic granular media. Water is retained within pockets on the upper sides of the drainage plates. Green roof drainage system of all the choices the owner or specifier has to make when designing a green roof drainage system the choice of waterproofing is easy.

Their modular design accommodates extensive semi intensive and intensive green roof systems from 4 to 32 thick. Excess water spills over the edges of the plates and is carried off the roof. To maximize water storage and minimize weight the granular media should contain a significant percentage of porous material such as heat expanded rock. A granular drainage layer that can be easily adjusted for any area or depth for extensive semi intensive or intensive green roofs in multi course systems promotes healthy plant growth by retaining draining water in a natural way provides a more natural root space with better water air distribution than synthetic options.