Green Roofs
About
Green roofs capture and temporarily store stormwater runoff before it flows into the roof guttering system. Most green roofs consist of a waterproof liner, a drainage system, a thin layer of specially engineered low and medium-growing, drought-tolerant plants, such as sedums.
benefits
Green roofs minimize rainwater runoff, save on heating and cooling expenses, improve air quality and provide habitat for pollinators and other animals.
Considerations
The materials of a green roof are heavier than a typical roof, so buildings must meet certain structural standards in order to support the extra weight. Consult a building engineer or architect to determine if the structure will adequately handle the load.
Some irrigation is likely necessary after installation to ensure the plants get established, but plant species are selected so that the roof does not need supplemental irrigation or fertilization after vegetation is initially established. Removing invasive plants, weeding, and overall vegetation management are the primary maintenance considerations, as well as structural repairs as needed.