Rooftop and vertical gardens as an adaptation strategy


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  • Why we need rooftop gardens in urban area
  • Root repelling agents??
  • 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 gardens as an adaptation strategy

    1. 1. Rooftop and vertical gardensas an adaptation strategy forurban areas
    2. 2. 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
    3. 3. 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
    4. 4. 4Rooftop gardens
    5. 5. 5Top view of some rooftop gardens
    6. 6. 6Close view of a rooftop garden
    7. 7. Benefits of roof top gardens (1)• Reduce urban heat island effect• Add beauty and usable space• Reduce energy requirement of buildings• Storm water management• Air quality improvement7
    8. 8. Benefits of roof top gardens (2)• Dust reduction• Increased life expectancy of roofmembranes• Noise reduction• Biodiversity preservation8
    9. 9. Basic Construction9Cross section of a typical rooftop garden
    10. 10. 10layerlayer
    11. 11. Practical considerations whenbuilding a rooftop garden• Condition of the roof• Structural capacity of the roof• Access to the roof• Cost• Irrigation• Drainage11
    12. 12. Maintenance considerations• Plant stress• Invasive weeds, stray tree seedlings• Shoot pruning• Nutrient deficiency• Pest and diseases• Drainage12
    13. 13. Long term issues• Plant replacement• Soil replacement• Deterioration of containers, tiles• Damage to building infrastructure (drainageproblems)13
    14. 14. What is a Vertical Garden?• A vertical garden or a living wall is a wallcovered with vegetation.– The plant supporting system is very light and thus can beimplemented on any wall.14
    15. 15. 15
    16. 16. 16Indoor vertical gardens
    17. 17. 17A vertical garden designed to allow some natural light in
    18. 18. 18Hydroponic vertical garden
    19. 19. Benefits of vertical gardens• Act as a thermal isolation system• Reduce the overall temperature of thebuilding in summer and protect the buildingfrom the cold in winter.19
    20. 20. Disadvantages of vertical gardens• Roots grow deep inside the wall and damage it• Only light weight plants can be used.20
    21. 21. Issues in vertical gardening• Flammability issues• Maintenance difficulties21
    22. 22. How these gardens become anadaptation strategy for urban areas?• Reduce air pollution22NoiseCombustion gasesDust
    23. 23. • Increased energy conservation23Thermal insulations no heat up/cool down is required energy preservation
    24. 24. Applications for a urban SriLankan home27
    25. 25. 25A growth pillar A growth column
    26. 26. 26
    27. 27. Plants that can be used for rooftopand vertical gardens• Ornamental plants• Edible plants• Medicinal plants27
    28. 28. Ornamental Edible Medicinal28Piper Nigrum L.Piper betle L.Solanum lycopersicumSolanum melongenaWattakaka volubilisClimbing rosesClematis spp.Asparagus falcatus
    29. 29. 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 from [Accessed20.03.2012]29
    30. 30. 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 from [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 from [Accessed 20.03.2012]• (20.03.2012)30
    31. 31. References (3)•• (20.03.2012)• (20.03.2012)• (20.03.2012)•• (20.03.2012)31
    32. 32. 32Thank you