Extensive Green Roof Construction

Green roofs consist of a number of layers including a waterproofing layer drainage layer substrate and planting.

Extensive green roof construction.

The intensive green roof intensive green roofs are the traditional garden roofs and can support a varied selection of plants. The plants in a green roof absorb water through their roots and then use surrounding heat from the air to evaporate the water while some roofs can reach temperatures of up to 90 f in the summertime these two features can allow. Green roofs and water quantity buffam and mitchell unpublished data most extensive green roofs will reduce stormwater flows on an annual basis by 50 green roofs also delay stormwater runoff but flow dynamics depend on climate and green roof design. For both of these we need to follow specific green roof construction and maintenance procedures.

Vegetative roofs are divided into two categories. They consist of a thin layer of soil with continuous coverage of growing material. They provide shade to the top of a building evapotranspiration. The growing medium depth for an extensive green roof system is typically 6 inches or less.

There are two types of green roof construction. They are fairly lightweight and can be installed on roofs with a pitch from 0º to 30º. 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. Extensive green roofs are generally made up of a very thin layer of soil or other planting medium with shallow root plants like sedum mosses and grasses.

A general characterization of the two types of green roofing systems follows. 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. Intensive green roofs require a depth of soil of about 600mm require irrigation weeding and care. Green roofs which are planted and seeded tend to perform better in the long term.

Extensive roofs are lower maintenance that intensive ones and lighter in weight. Green roofs reduce the temperature of the building and the surrounding air in multiple ways. An extensive green roof is the most common and least expensive type of green roof with costs ranging from 10 20 a square foot 2.