Roof covered with 2"-5" of light weight growing medium and plants able to thrive in conditions of drought, high winds and high sun exposure in little soil with no ambient heat.
Weight is comparable to that of a gravel ballast roof.
Typically does not require additional structural support.

 

Advantages

Reduces runoff from roof surface an average of 75% compared to a traditional impervious roof
Lowers cost of stormwater management infrastructure
Reduces downstream flooding, sedimentation and lakeshore and streambank erosion by minimizing rainfall that enters into storm sewers
Vegetation cleanses rainwater from heavy metals and excess nutrients - over 95% of cadmium, copper and lead and 16% of zinc can be removed from rainwater by roof garden plants; nitrogen can also be substantially reduced.
Insulates building, contributing to energy savings.
Prolongs life of roof by shielding the roof from the effects of ultraviolet radiation, temperature extremes, and mechanical damage.
Reduces ambient air temperatures (in contrast to impervious roofs, which greatly increase temperatures).
Filters and binds dust particles and naturally filters airborne toxins.
Enhances aesthetics.
Provides acoustic insulation.
Lessens stormwater utility fees.

 

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