This presentation gives a basic information about green roofing technology with easy English in a simple way. It has been used for conducting data about a study on "Assessing the awareness about green roofing technology and the effect of lecture on it. It is with minimum words and maximum content.

1. GREEN ROOFING TECHNOLOGY
M. ARAVIND
MBBS I YEAR
DSMCH, PERAMBALUR

2. Living roofs
Vegetated roofs
Eco roofs
Roof gardens
DEFINITION:
A green roof is a planted roof top
Container gardens on roofs are not
generally considered to be true green roofs.

3. LAYERS OF A GREEN ROOF (7 – 8)
 Vegetation
 Growing medium
 Filtration membrane
 Drainage layer
 Protection & storage layer
 Water proofing membrane
 Roof construction

4. ROOF CONSTRUCTION
 Can be constructed from wood, metal, concrete,
plastic, gypsum, or composite
 Concrete decking will provide the most sturdy roof
structure

5. WATER PROOFING MEMBRANE
 to protect the building from water penetration.
Some rubber and plastic sheet-applied and liquid-
applied membranes meet these criteria

6. PROTECTION AND STORAGE LAYER
 To protect the roof membrane from aggressive plant
roofs.
 Mats with enhanced water storage and capillarity are
preferred for some green roof systems.

7. DRAINAGE LAYER
 to help the excess water from the growing medium
to flow to the roof drain.

8. FILTRATION MEMBRANE
 Allows excess water from the growing medium to
flow out, while preventing the fine particles from
washing away and clogging the roof drain.

9. GROWING MEDIUM
 Engineered soil: It must be lightweight, have good
water storage characteristics, cheap
 Organic composts are also included in it.
 Natural soil: plants and insects adapt to it easily
With an average flow rate of 35
cubic yard per hour it can reach
as far as 500 yards and more.
ideal for large scale roof
structures

11. VEGETATION
 minimal input plants should be
selected (water, fertilisers, etc.)
 drought tolerant & cold tolerant
 Resistant to pests
 Low maintenance
 Root systems should be shallow.
 Self-perpetuating

12. HARDY SUCCULENTS
 best suited
 Advantages: can
survive drought/ wind/
temperature
extremes, store water
for extended periods
 Only viable option for
certain shallow soil
extensive roofs
Talinum
Delosperma
Coastal strawberry
Sempervium

13. SEDUMS
 Nearly 600 species
available
 Found in well drained
areas
 Long life span and self-
propagating
 Change color with the
seasons

14. HERBACEOUS PERENNIALS
 Added culinary and
olfactory perks
 Advantages: aesthetically
pleasing, lots of variety
 Disadvantages: Most have
limited drought tolerance,
will require deeper
substrate, biomass
accumulates as they grow,
very few are evergreen
Dianthus
phlox
Petrorhagia
Campanula

15. GROUNDCOVERS
 provide dense soil cover, retard weed growth, and
prevent soil erosion
 Should be low density ground covers
 rapid and reliable growth at a reasonable price
often function in an ecological system which makes their
inclusion in green roofs somewhat difficult
Advantages: already adapted to local weather conditions,
resistance to local pests etc.

16. INTENSIVE GREEN ROOFS
 Structural requirements:
structural improvements
necessary
 Irrigation: often require irrigation
 Maintenance: same
maintenance requirements as
similar garden at ground level
 Cost:
 Acessibility: less prevalent

17. EXTENSIVE GREEN ROOFS
 Structural requirements: typically within standard
roof weight bearing parameters
 Irrigation: most require little or no irrigation
 Maintenance: little or no maintenance required;
some weeding or mowing as necessary
 Accessibility: generally functional than accessible.
Most prevalent

18. SEMI-INTENSIVE
GREEN ROOFS
 Between intensive
and extensive
green roofs
regarding
maintenance and
support capacity

19. ADVANTAGES
ENERGY
EFFICIENCY
 significantly reduce roof
surface temperatures and
heat flux rates (energy
passing through a unit area
per unit time).
 A study in Toronto: green
roofs with minimal vegetation
reduced peak summer time
heat flow by 70 to 90%.

20. STORM WATER RUNOFF
 extensive roofs will
typically capture between
50 - 85% of incoming rain
 depends on amount of
growing medium, density
of vegetation, the intensity
of rainstorm, and the
frequency of rain

21. REDUCES AIR POLLUTION
 removes particulate matter (PM) and gaseous
pollutants including nitrogen oxides (NOX), sulphur
dioxide (SO2), carbon monoxide (CO), and ground-
level ozone (O3)
 Researchers estimate that a 1,000-sq. Ft. (93 sq.
m) green roof can remove about 40 pounds of PM
in a year (15 cars will emit in a year)

22. REDUCE URBAN HEAT ISLAND EFFECT
 Cities can be 2 degrees to 8 degrees warmer than
surrounding environments (rural) due to the large areas of
dark surfaces. Due to lack of green spaces the extra heat
cannot escape into the atmosphere. This phenomenon is
urban heat island effect
 lower temperatures by 3.6 to 11.3”C depending on the city.

23.  by preventing degradation from solar radiation

24. BROWN ROOF
 It supports rare species of
animals, birds and
invertebrates
 Contributes to biodiversity and
creates habitats

25. The Fairmont Waterfront Hotel, Canada

26. DISADVANTAGES
 Initial cost of installation is high
 Pest insects could easily infiltrate a residential
building through open windows
 For intensive green roofs there is additional cost of
reinforcing the building
 Based on the green roof types, the maintenance
work and the cost of installation are high

27. COSTS AND FINANCIAL BENEFITS
 Extensive green roof: Rs. 110 - 150
 Intensive green roof: Rs. 210 - 250

29.  allows buildings to retain
heat during winter months
while reflecting and
absorbing solar radiation
during the hotter summer
months.
 reduce building
temperatures by up to
20 °C & reduce energy
needs for air-conditioning
by 25% to 80%.
 Reduce energy to heat a
building in the winter.

30.  can extend by over 200%
 increase the real estate value of an average house by about
7%.
 Air pollution
 significant urban heat island effect
 Stormwater runoff is of great concern
 Eg: one-year property tax credit is available in New York City,
since 2009, for those who green at least 50% of their roof
area.

31. NEED OF GREEN ROOFS
 Over 50% of the world's population currently lives in urban
areas. This is expected to increase to 70% by 2040.
The WHO recommends 9 sq.
m open space per city dweller
should be minimal norm for a
city. Gandhinagar - 162 sq. m
per dweller green space,
Chandigarh - 54 sq. m, Delhi -
21 sq. m, Bangalore - 17 sq.
m and Chennai - 0.46 sq. m
per city dweller. In such a
situation, “green roofs” is the
only way to offset this
problem

32. INCENTIVES AND MANDATES
 Germany : 15 euros /m2 of green roof
 Switzerland : 25 % new commercial
development should be greened
 Chicago is at the fore front

33. GREEN ROOF COVER IN DIFFERENT
PARTS OF THE WORLD
 Dusseldorf, Germany
 Stuttegart, Germany
 Basel, Switzerland
 London, England
 Portland Oregon
 Chicago, Illinois

34. STUCKI SHOPPING CENTER GREEN ROOF
GREEN ROOFS IN BASEL, SWITZERLAND

35. CANTONAL HOSPITAL GREENROOF

36. BASEL MAIN EXHIBITION HALL (MESSEHALLE
BASEL) GREEN ROOF
 8,000 m². The roof was originally installed in 2000
with 7cm of volcanic substrate and planted with
sedums.
 largest greenroof in Switzerland

37. one of the first cities to pass a law mandating that every
new flat topped building be planted with a green roof
GREEN ROOFS IN STUTTGART, GERMANY

38. Tokyo’s historic
Imperial Hotel Tokyo
JAPAN

39. INCS Zero production facility in Japan
The city has
mandated green roofs
Japan is a prime
example of an
urban heat island

40. Brooklyn Grange (vegetable farm)

41. California academy of sciences building in San
franscisco (sloped roof)

43. The Parkroyal Hotel(15,000 sq m)

44. The School of Art, Design and Media

45. ACROS FUKUOKA PREFECTURAL INTERNATIONAL HALL

46. London Zoo.

47. Beaufort Court

48. Mountain Equipment Co-op

49. Vintava hotel, Bangalore
GREEN ROOFS IN INDIA

50. Here's a volunteer green roof. Who says green
roofs are high maintenance?

51. THANK YOU