Intensive Green Roof Thickness

The nominal thickness of a green roof is the approximate total height of the soil and drainage components that constitute the green roof system excluding the roof structure insulation waterproofing and plants it is common practice to use the term extensive to describe green roofs that are very thin and will only support hardy drought resistant vegetation.

Intensive green roof thickness.

What is the difference between an extensive and intensive green roof. 15 to 50 per square foot. In the city of chicago alone a weston design consultant study estimates the. The substrate depth of extensive green roofs is smaller than that found in intensive roofs usually around 100 150mm given their relative shallowness extensive green roofs usually serve aesthetic and environment purposes rather than functioning as accessible roof space.

Intensive green roofs are the heavy weights literally of the green roof world. Difference extensive and intensive green roofs. 8 to 20 per square foot. 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.

In essence they are parks or gardens on roofs. Intensive green roof garden roof roof garden an intensive green roof system is characterized by its variety of vegetation ranging from herbaceous plants to small trees with professionel maintenance and advanced green roof irrigation systems a typical growing medium depth of an intensive green roof is 6 inches or more intensive green roofs offer a great potential for. 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. The word intensive actually refers to the amount of input required to maintain a green roof.

The weight of an intensive green roof system is critical for a particular type of plant and the minimum intensive green roof thickness should ranges from 150mm for a wild grassland 300mm for bushes and 3 meters in height and at least 400mm upper substrate and 250 mm lower substrate for small trees of approximately 10 meters. 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. 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. Le jardin de toit paris intensive green roofs maintenance rooftop garden allen overy london.

These roofs differ from each other in the thickness of the structure its weight and the amount of maintenance that the plants require.