They act as a thermal isolation system: they reduce the overall temperature of the building in summer and protect the building from the cold in winter.They avoid the risk of floods because they retain some of the water that comes from the storms-not considerablyThey save water because they are based on a closed water circuit.
Issues and disadvantages are same
+ reduction of green house gases, air pollution reduction, decrease the global warming.
Rooftop and vertical gardensas an adaptation strategy forurban areas
Contents01• What is a rooftop garden, a vertical garden?02• Benefits, construction of rooftop gardens03• Maintenance considerations, long term issues of rooftop gardens04• Benefits, disadvantages and issues of vertical gardens05• How these gardens become an adaptation strategy for urban areas?06• Applications for urban SriLankan homes07• References2
What is a rooftop garden?• Rooftop gardenAny outdoor, elevated garden.- They are generally found in urban areas.- They can be public, semi public or private.• Vertical gardenA vertical garden is a wall covered withvegetation.3
References (1)• Janick, J. (1972)Horticultural science, 2nd edition. W.H. Freeman and company, SanFrancisco : 564-570• Prakash, J. and Pierik, R.L.M. (1991) Horticulture - New technologiesand applications. Kluwer academic publishers, The Netherlands :401-404• Richard, D.M (2008) Chicago’s green rooftops, A guide to rooftopgardening, Chicago Department of Environment.Chicago.• Lars, B. Lennart, G. Jonas, L. (2005) Hydrological function of a thinextensive green roof in southern Sweden. Nordic hydrology , 36(3),pp. 259-268[Online] Available fromhttp://cat.inist.fr/?aModele=afficheN&cpsidt=16976182 [Accessed20.03.2012]29
References (2)• Niachou, A. Santamouris, M. Tsangrassoulis, A. (2001) Analysisof the green roof thermal properties and investigation of itsenergy performance. Energy and Buildings, 33(7) : 719-729[Online] available fromhttp://www.sciencedirect.com/science/article/pii/S0378778801000627 [Accessed 20.03.2012]• Wong, N.H. Alex, Y.k.T. Yu, C. Kannagi, S. Puay, Y.T. Derek, C.Kelly, C. Ngian, C.W. (2010) Thermal evaluation of verticalgreenery systems for building walls. Building and Environment45(3) : 663-672 [Online] available fromhttp://www.sciencedirect.com/science/article/pii/S036013230900198X [Accessed 20.03.2012]• http://www.colostate.edu/Depts/CoopExt/4DMG/Flowers/Vines/annual.htm (20.03.2012)30