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Background of the Study
Basic definition
In our study, we adopted the following definition:
“A roof area of plantings or landscape installed above a waterproofed substrate at any building level that is separated from the ground beneath it by a man-made structure.” – NRCA Green Roof System Manual 2007
There are more definitions from different institutions of similiar meanings, for details please visit 'What is roof greening'.
1. Amenities and asthetics benefits
2. Environmental benefits
3. Economic benefits


Intensive Roof System
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recreational purposes
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larger variety of plants
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costly: installation and maintenance
Extensive Roof System
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greening purposes only
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limited to short plants like grass and mosses
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cheaper: installation and maintenance
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