Extensive Green Roof Construction

For an extensive green roof the plants should be able to grow in under 5 inches of soil.

Extensive green roof construction. 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. 8 to 20 per square foot. Green roof irrigation system. For a conventional 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. Moisture retained by saturated media after free draining 40 60 typ. These systems are ideal for efficient stormwater. Plants for an intensive green roof may be able to have a deeper root system.

However semi intensive and intensive roofs do. For both of these we need to follow specific green roof construction and maintenance procedures. Extensive green roofs which are most often used for residential homes do not require watering. Typically these roofs will have more soil and some small shrubs as well as the low growing wildflowers and sedums found on an extensive roof.

They are differentiated on the basis of plant selection growing medium type and overall cost. Moisture retained by media that cannot be removed aka wilt point 12 18 typ. A general characterization of the two types of green roofing systems follows. The government undertook fire tests for green roofs and walls and concluded that the current guidance provided by the green roof code was adequate and extensive green roofs installed following the code would not be deemed a fire risk.

Green roofs can help reduce energy costs for a building by acting as another layer of insulation between the inside and outside of the roof. This is most noticeable in intensive green roofs since there is a thicker and more consistent layer of soil which provides a higher insulating value. 15 to 50 per square foot. The following steps apply to extensive green roof construction.

Generally there are two types of green roof systems. 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. Your roof deck be it concrete or screed will need to be waterproofed. Green roof components growing media water holding capacity field capacity maximum water capacity astm test.

Extensive green roofs. Step one primary waterproofing layer. Some roofs will already have a waterproof layer. It also allows for a formal garden to be installed with paths grass lawn and flowers or pot plants.