unless they were designed for the load, long time water retention etc- it can be an expensive rennovation/refit and brings additional maintenance costs but it i

unless they were designed for the load, long time water retention etc- it can be an expensive rennovation/refit and brings additional maintenance costs but it is still a good idea. There are increasingly Tax breaks for necessary investment available in cities in the US doing this (1)and certainly many other countries/regions e.g (2) have various on going policy initiatives for similar developments. all in all - its highly dependent on the building and local planning regulations - but more and more places are open to supporting it and hopefully actual adoption and implementation accelerates soon. (1) http://myplantconnection.com/green-roofs-legislation.php http://myplantconnection.com/green-roofs-legislation.php (2) http://ec.europa.eu/environment/nature/ecosystems/background.htm http://ec.europa.eu/environment/nature/ecosystems/background...