The growing medium depth for an extensive green roof system is typically 6 inches or less.
Extensive green roof section.
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The modular units are often plastic or metal trays filled with growing medium.
Green roof components growing media water holding capacity field capacity maximum water capacity astm test.
Nophadrain extensive green roof system.
The intensive green roof system is a modern concept allowing people to be present and enjoy in the environmental friendly way of bonding with all the plants and trees present.
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.
Extensive green roof an extensive green roof system is characterized of its vegetation ranging from sedums to small grasses herbs and flowering herbaceous plants which need little maintenance and no permanent irrigation system.
The planting medium in extensive green roofs ranges from 1 6 to 6 inches deep and while deeper systems have been installed they are not favored as much as the shallower systems drought tolerant sedums succulent plants and grasses are the typical plants used since they are shallow rooted and use little water plant diversity on these roofs is kept low to simplify care and to be sure all plants have similar moisture requirements.
Vegetative roofs are divided into two categories.
Moisture retained by media that cannot be removed aka wilt point 12 18 typ.
Moisture retained by saturated media after free draining 40 60 typ.
1 extensive vegetative roofs which are 6 inches or shallower and are frequently designed to satisfy specific engineering and performance goals and 2 intensive vegetative roofs which may become quite deep and merge into more familiar on structure plaza landscapes with promenades lawn large perennial plants and trees.
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Some green roofs are installed in one large integrated section while modular green roofs use small portable planting beds placed together to create a larger green roof.