Shallow Green Roof

Extensive green roofs are shallow and can provide the environmental benefits of a green roof but cannot support regular foot traffic.

Shallow green roof.

Green roofs are also known as vegetative or eco roofs. Extensive green roof characteristics. There are two types of green roof. These creepers have shallow roots 2 5cm 1 2 deep and when planted in typical green roof soils with relatively low water content based on fll standards the root zone gets too hot and dry so these sedums easily go dormant on the roof.

Shallow growing medium typically less than 200mm. Extensive green roofs are generally made up of a very thin layer of soil or other planting medium with shallow root plants like sedum mosses and grasses. Although there are no precise definitions of them an extensive green roof has a shallow growing medium usually less than six inches with a modest roof load limited plant diversity minimal watering requirements and is often not accessible. Extensive green roofs have a thin growing medium while intensive green roofs have deeper soil and are much heavier.

Not suitable for general access. They fall into three main categories extensive intensive and semi intensive. Vegetation generally limited to low shallow rooting and groundcover plants that are tolerant of drought wind exposure and temperature fluctuations. Intensive roofs which are thicker with a minimum depth of 12 8 cm 5 1 16 in and can support a wider variety of plants but are heavier and require more maintenance and extensive roofs which are shallow ranging in depth from 2 cm 13 16 in to 12 7 cm 5 in lighter than intensive green roofs and require minimal maintenance.

Roof structure similar to conventional roof coverings.