Extensive Green Roof Construction

For both of these we need to follow specific green roof construction and maintenance procedures.

Extensive green roof construction.

Comparatively low capital cost. A general characterization of the two types of green roofing systems follows. Green roofs reduce the temperature of the building and the surrounding air in multiple ways. Intensive green roofs require a depth of soil of about 600mm require irrigation weeding and care.

Extensive roofs are lower maintenance that intensive ones and lighter in weight. Green roofs which are planted and seeded tend to perform better in the long term. 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 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 consist of a number of layers including a waterproofing layer drainage layer substrate and planting. The planting medium in extensive green roofs ranges from 1 6 to 6 inches deep and while deeper systems have been installed they are not favored as much as the shallower systems drought tolerant sedums succulent plants and grasses are the typical plants used since they are shallow rooted and use little water plant diversity on these roofs is kept low to simplify care and to be sure all plants have similar moisture requirements. 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. Vegetative roofs are divided into two categories.

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. 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.

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