An architect, engineer and green roof provider are needed to ascertain that a green roof can be installed on a new building. Source: Peter Casamento Irrigation may need to be provided during hot dry periods to ensure greater vegetation success. Ensure access for passers-by is not impeded. On a larger scale, green roofs, walls and facades can help to reduce overall environmental heat gain re-radiation of heat from building materials with high thermal mass , in turn improving air quality as less photochemical pollutants are produced at lower air temperatures. Ashlee Vance.
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