File:Intensive extensive green roofs.png

Intensive_extensive_green_roofs.png ‎(300 × 322 pixels, file size: 16 KB, MIME type: image/png)

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English: Schematic showing the setup of an intensive and an extensive green roof. For the thicknesses of the growing medium layer of both, we can make a distinction into 4 types[1][2]:

Extensive green roofs:

  • thickness range 1= 7,6 cm to 10,2 cm (suitable for sedums, herbs)
  • thickness range 2= 12,7 cm to 17,8 cm (sedums, herbs, perennials)

Intensive green roofs:

  • thickness range 3= 25,4 cm to 30,5 cm (perennials, grasses, shrubs
  • thickness range 4= 30,5 cm+ (grasses, shrubs, trees)

Note that only tickness range 1 and 4 are shown in the schematic. Thickness range 3 was not drawn out, as it seems to be only practical for when designing sod roofs (which are not accessible roofs). Thickness range 4 instead are true intensive green roofs which are accessible[3]

Note thate the membrane protection also works as root barrier, see this document, at page 2, it's marked as simply "root barrier" in the image

Main references:

  1. ↑ Depths of extensive and intensive green roof media
  2. ↑ Depth of extensive and intensive green roof media, not that a minimum depth for intensive green roofs of 25,4 cm is given there
  3. ↑ Thicknesses of growing medium of intensive, extensive and semi-intensive roofs

Other references:

  • http://godfreyroofing.com/wp-content/uploads/2011/09/green-roofing-layers.png
  • https://www.sfu.ca/sustainablevancouver/efl/alternativeroofing/images/image011.jpg
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