15 to 50 per square foot.
Extensive green roof system.
To start with take a look at the most simple family of green roofs.
A 2006 study by the university of michigan comparing costs of conventional and green roofs showed that on average installing a green roof costs about 22 00 sq.
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.
An extensive garden roof assembly can be applied to flat roofs and sloping roofs with a pitch of up to 12 12 or 45 provided the appropriate measures are taken to cope with the shear forces and soil retention.
Finally the extensive green roof is a system that is generally inaccessible to pedestrians.
They fall into three main categories extensive intensive and semi intensive.
Extensive roofs are typically lightweight and can be installed over a variety of structures including metal roof decks.
Three types of green roofs exist.
The biggest benefit of extensive green roofs is that they need very little maintenance.
Extensive systems weigh anywhere from 10 to 25 pounds per square foot when dry which is why the interlocking system of trays is important otherwise strong winds could very easily blow the plantings away.
Green roofs are also known as vegetative or eco roofs.
The heart of the nophadrain extensive green roof system the nd 4 1h drainage system is the ideal under layer for an extensive green roof.
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 growing medium depth for an extensive green roof system is typically 6 inches or less.
For a conventional roof.
Extensive green roofs sedum roof systems.
These systems are ideal for efficient stormwater.
This multifunctional ce marked drainage system with high compressive strength protects the vegetation from water stagnation while at the same time storing water for dry periods in the built in water reservoir.
Extensive green roofs.
Besides the visual impact of an extensive green roof they also provide a natural habitat for birds and insects.
Extensive green roofs are designed to be low maintenance lightweight systems with no general access.
A green roof is a layer of vegetation planted over a waterproofing system that is installed on top of a flat or slightly sloped roof.
From a distance an extensive sedum roof can be mistaken for a grass field.
The movement of people is limited to maintaining a watertight roofing membrane and the health of the plants.
Extensive semi intensive and intensive green roofs.