Extend Roof Service Life 
Green Roofs can extend the life of roof membranes, beyond their normal life span or warranty term, by shielding them from UV  
radiation, protecting them from severe temperature extremes (freeze/thaw cycles) and mechanical damage caused by wind-blown  
debris. Longer roof service life equates to lower life cycle costing. 
Reduce Storm Water Runoff 
& Erosion
According to livingroofs.org, in the summer, Green Roofs can retain 70-80% of rainfall, and in winter, they can 
retain between 25-40% of rainfall. Green Roofs reduce the impact of rainwater run off on the municipal storm water drainage  
system, and the surrounding watershed, and also can reduce the potential of local flooding. 
On hot summer days, the surface temperature of a vegetated rooftop can be cooler than the air temperature, whereas the surface of 
a traditional rooftop can be up to 90°F (50°C) warmer. 
Mitigate Urban Heat Island Effects 
Green Roofs counter the urban heat island effect by cooling and cleaning the air adjacent to the roof through plant 
evapotranspiration, shading and insulation. 
Provide Natural Sound Barrier 
Green Roofs reduce the transmission and reflection of sound by noise absorption. 
Conserve Energy 
Green Roofs can reduce a building’s heating and cooling demands. They absorb and hold energy from sunlight, and then slowly 
release the stored energy as the ambient air temperature cools. Buildings remain cooler in the summer and warmer in winter due to 
a reduction in thermal loading. 
Create Urban Greenspace 
Green Roofs have an aesthetic benefit in congested areas where roof gardens break up the landscape and provide a 
pretty, green vista. 
Improve Air Quality 
Green Roofs purify the air by absorbing pollutants. 
Enhance Building’s LEED Performance 
A Green Roof will contribute to LEED (Leadership in Energy & Environmental Design) green building certification. 

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