2. Contents
01
• What is a rooftop garden, a vertical garden?
02
• Benefits, construction of rooftop gardens
03
• Maintenance considerations, long term issues of rooftop gardens
04
• Benefits, disadvantages and issues of vertical gardens
05
• How these gardens become an adaptation strategy for urban areas?
06
• Applications for urban SriLankan homes
07
• References
2
3. What is a rooftop garden?
• Rooftop garden
Any outdoor, elevated garden.
- They are generally found in urban areas.
- They can be public, semi public or private.
• Vertical garden
A vertical garden is a wall covered with
vegetation.
3
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 improvement
7
8. Benefits of roof top gardens (2)
• Dust reduction
• Increased life expectancy of roof
membranes
• Noise reduction
• Biodiversity preservation
8
11. Practical considerations when
building a rooftop garden
• Condition of the roof
• Structural capacity of the roof
• Access to the roof
• Cost
• Irrigation
• Drainage
11
12. Maintenance considerations
• Plant stress
• Invasive weeds, stray tree seedlings
• Shoot pruning
• Nutrient deficiency
• Pest and diseases
• Drainage
12
13. Long term issues
• Plant replacement
• Soil replacement
• Deterioration of containers, tiles
• Damage to building infrastructure (drainage
problems)
13
14. What is a Vertical Garden?
• A vertical garden or a living wall is a wall
covered with vegetation.
– The plant supporting system is very light and thus can be
implemented on any wall.
14
19. Benefits of vertical gardens
• Act as a thermal isolation system
• Reduce the overall temperature of the
building in summer and protect the building
from the cold in winter.
19
20. Disadvantages of vertical gardens
• Roots grow deep inside the wall and damage it
• Only light weight plants can be used.
20
29. References (1)
• Janick, J. (1972)
Horticultural science, 2nd edition. W.H. Freeman and company, San
Francisco : 564-570
• Prakash, J. and Pierik, R.L.M. (1991) Horticulture - New technologies
and applications. Kluwer academic publishers, The Netherlands :
401-404
• Richard, D.M (2008) Chicago’s green rooftops, A guide to rooftop
gardening, Chicago Department of Environment.Chicago.
• Lars, B. Lennart, G. Jonas, L. (2005) Hydrological function of a thin
extensive green roof in southern Sweden. Nordic hydrology , 36(3),
pp. 259-268
[Online] Available from
http://cat.inist.fr/?aModele=afficheN&cpsidt=16976182 [Accessed
20.03.2012]
29
30. References (2)
• Niachou, A. Santamouris, M. Tsangrassoulis, A. (2001) Analysis
of the green roof thermal properties and investigation of its
energy performance. Energy and Buildings, 33(7) : 719-729
[Online] available from
http://www.sciencedirect.com/science/article/pii/S03787788
01000627 [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 vertical
greenery systems for building walls. Building and Environment
45(3) : 663-672 [Online] available from
http://www.sciencedirect.com/science/article/pii/S03601323
0900198X [Accessed 20.03.2012]
• http://www.colostate.edu/Depts/CoopExt/4DMG/Flowers/Vi
nes/annual.htm (20.03.2012)
30
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.