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.
Extensive green roof section.
Nophadrain extensive green roof system.
Moisture retained by media that cannot be removed aka wilt point 12 18 typ.
Cad drawings extensive green roof.
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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.
Vegetative roofs are divided into two categories.
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Moisture retained by saturated media after free draining 40 60 typ.
A properly designed and installed extensive green roof system can cost 108 248 m 2 10 23 sq ft while an intensive green roof costs 355 2 368 m 2 33 220 sq ft however since most of the materials used to build the green roof can be salvaged it is estimated that the cost of replacing a green roof is generally one third of the initial installation costs.
Cad drawings extensive green roof.
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.
Green roof components growing media water holding capacity field capacity maximum water capacity astm test.
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.
The growing medium depth for an extensive green roof system is typically 6 inches or less.