Green roof design

Question

Let's discuss advantages and disadvantages of Green Roof. Also share ideas on how to design the green roof for a particular area? Is possible to construct green roof in arid zone?

Kevin Niegi · Accepted Answer

green roofs....
Green roof refers to a system of roofing that uses plant for roof covering instead of traditional covering materials. 
some of the benefits of the GR are,
 
Add insulation to the building
Reduce stormwater runoff
Cool the surrounding air and lessen the heat-island effect in urban areas
Reduce air pollution
Capture carbon dioxide to help reduce global warming
Mitigate noise and glare
Create new habitat for birds and other wildlife.
 Some of the limitation are: these are more expensive to install than traditional roofs, require intensive maintenance, irrigation and drainage systems, are limited by climate conditions, and can be costly to repair.