Green Roof Dimensions

G 2 intensive green roofs have a growing media layer that ranges from 6 to 48 inches thick.

Green roof dimensions. Design variants include extensive and intensive green roofs. 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. Intensive roofs which are thicker with a minimum depth of 12 8 cm 5 1 16 in and can support a wider variety of plants but are heavier and require more maintenance and extensive roofs which are shallow ranging in depth from 2 cm 13 16 in to 12 7 cm 5 in lighter than intensive green roofs and require minimal maintenance. G 1 extensive green roofs have a much shallower growing media layer that typically ranges from 3 to 6 inches thick.

An intensive green roof is a deeper typically greater than six inches heavier system designed to sustain complex landscapes. For intensive green roof profiles a drain restrictor may be used to retain water in the base of the profile for subsequent plant transpiration. 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. There are two types of green roof.

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.