Extensive Green Roof System

Extensive green roofs are designed to be low maintenance lightweight systems with no general access.

Extensive green roof system.

Extensive green roofs sedum roof systems. 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. 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. Finally the extensive green roof is a system that is generally inaccessible to pedestrians.

Three types of green roofs exist. Extensive green roofs. Typically they have thin layers of substrate the growing medium to keep depth and weight to a minimum. Extensive roofs are typically lightweight and can be installed over a variety of structures including metal roof decks.

These are covered with low growing plants such as evergreen sedums. These systems are ideal for efficient stormwater. 15 to 50 per square foot. 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.

To start with take a look at the most simple family of green roofs. From a distance an extensive sedum roof can be mistaken for a grass field. 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. Extensive semi intensive and intensive green roofs.

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. 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. 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. Besides the visual impact of an extensive green roof they also provide a natural habitat for birds and insects.

The movement of people is limited to maintaining a watertight roofing membrane and the health of the plants. 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. For a conventional roof. They fall into three main categories extensive intensive and semi intensive.