Extensive Green Roof System

These systems are ideal for efficient stormwater.

Extensive green roof system.

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. 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. Extensive roofs are typically lightweight and can be installed over a variety of structures including metal roof decks. 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.

Extensive semi intensive and intensive green roofs. From a distance an extensive sedum roof can be mistaken for a grass field. Besides the visual impact of an extensive green roof they also provide a natural habitat for birds and insects. 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.

Typically they have thin layers of substrate the growing medium to keep depth and weight to a minimum. 15 to 50 per square foot. The movement of people is limited to maintaining a watertight roofing membrane and the health of the plants. The biggest benefit of extensive green roofs is that they need very little maintenance.

For a conventional roof. Three types of green roofs exist. Extensive green roofs. 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.

These are covered with low growing plants such as evergreen sedums. Extensive green roofs are designed to be low maintenance lightweight systems with no general access. They fall into three main categories extensive intensive and semi intensive. 8 to 20 per square foot.

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. Finally the extensive green roof is a system that is generally inaccessible to pedestrians. Extensive green roofs sedum roof systems. To start with take a look at the most simple family of green roofs.