1.4.9 Green Roof
Mitigate the urban heat island effect and reduce degradation of roof membranes due to UV and heat exposures. Vegetation and growing plant material replaces the directly exposed traditional roof surface.
Categories for green roofs range from intensive [minimum 12” (0.30 m) soil depth, large trees, shrubs, gardens, complex irrigation & drainage, added 80 to 150 psf] to semi-intensive to extensive [1 to 5” (0.02 to 0.12 m) soil depth, vegetative ground cover and grasses, simple irrigation, added 12 to 50 psf].
Green roofs can be used in many applications, including industrial facilities, residences, offices, and other commercial property. They are increasingly chosen for their membrane-protective advantages (triple life span), storm water management and energy savings potential as well as their aesthetic benefits.
Cost savings due to reduction in roof maintenance, replacement and water run-off. Reductions due to increased insulating values can be 5 percent or more.
Similar to other membrane protections, a green roof can triple the life span of a roof due to protection from direct UV and heat exposure [up to 90° F (32° C) less]. Green roofs mitigate the heat island effect, provide additional insulation and reduce runoff by 50 percent or more.
Verify structural capacity of the roof, weight of materials, roof slope, irrigation & drainage, wind exposure and access.
1.4.10 Green Walls
2.1.1 Rainwater Storage and Use
2.2.3 Pervious Surfaces
4.6.1 Heat Island Effect