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Green Roof Types:
General
Definitions
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Intensive Green Roof System:
Green roof site with growing medium greater than 6 inch depth
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Extensive Green Roof Systems:
Green roof sites with growing medium less than 6 inch depth
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Multi-course extensive system:
extensive green roof system using two or more distinct types of media,
one of which is optimized for drainage.
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Multi-layer extensive system:
single medium extensive green roof system with a high-efficiency
synthetic drainage layer instead of a separate drainage course.
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Single-layer extensive system:
single medium extensive green roof system without a high-efficiency drainage
layer.
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Drainage course:
aggregate material used for drainage course in a multi-course extensive
green roof system.
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