Extensive green roofs “The two basic types of green roof systems ” extensive and intensive ” are differentiated mainly by the cost, Outdoor designs with pool depth of growing medium and the choice of plants,” she explains. “Extensive green roofs are often not accessible and are characterised by low weight, low capital cost, low plant diversity and minimal maintenance requirements.” The growing medium varies in depth between 100mm and 300mm and due to the shallowness and the extreme desert-like microclimate on many roofs, the plants chosen must be low and hardy. “Depending on the climate and location, typically the plants are watered and fertilised only until they are established and there isn’t much maintenance needed, mainly just weeding of invasive species and membrane inspections,” adds Sidonie.
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