1. Roof Garden
Green roof is an environmental,
social and economical use of the
building roof.
2. Roof garden
• A roof garden is any garden
on the roof of a building.
Besides the decorative
benefit, roof plantings may
provide food, temperature
control, hydrological
benefits, architectural
enhancement, habitats or
corridors for wildlife, and
recreational opportunities.
The practice of cultivating
food on the rooftop of
buildings is sometimes
referred to as rooftop
farming.
3. History of roof gardens
• The first known historical
reference to a roof garden
above grade is for the stone
temples
• in the region of Mesopotamia.
Civilizations in Mesopotamia
built
• roof gardens thousands of
years ago on the landings of
Ziggurats, or stepped pyramids.
• The plantings of trees and
shrubs softened the climb,
provided shade and relief from
the heat
4. • The next known successor to the
roof gardens are the Hanging
Gardens of Babylon built
• by the Persians around the 500
B.C (Weiler & Barth, 2009). The
roof gardens along with being a
visual delight cooled the hot
landscapes and provided greenery
5. The World Exhibition in Paris
1867 was one of the first demonstrations of a
planted concrete roof in Western Europe
In the Middle Ages and
Renaissance, there were
additional demands from the
roof
gardens and that was to meet
the demands of Christian
ecclesiastical architecture and
wealthy families of the era
(Osmundson, 1999). Palazzo
Piccolomini, Pienza, Italy
6.
7. Roof garden
• The first and most important step involved in making terrace garden
is to identify the area of terrace where you plan to build a roof
garden.
• the roof on which we are designing garden should be strong
enough to carry the weight of garden.
• The roof should not have any leakage of water in roof and it should
have effective drainage system.
• Roof garden can be made on half of terrace leaving a patio to make
a sitting place.
8. Water proofing of roof
• Next step is water proofing the roof
slab to prevent the seepage in the
roof. A proper water proofing
treatment should be done before
building a roof garden.
• Chemical based water proofing
treatment is more effective than
covering based water proofing.
• Drainage pipes should also be laid
over the roof slab.
• A water proof covering with the
thermoplastic or rubberized sheeting
should be installed.
• Filter sheet is also necessary to drain
off the moisture from the roof slab.
9. Steps to be followed.
STEP 1: waterproofing
• Cutting and laying of liner ( waterproofing
membrane)
• Applying solvent
• Fixing liner
• Leakage test by keeping water for upto
48hrs
STEP 2: Installation of drainage cells
STEP 3: Laying of geotextile
STEP 4: Filling planting soil
• Filling of sand, soil and coco pit
• Mixing of planting soil
• Leveling
STEP 5: Planting plants
14. 1. Plants cool the air around the
rooftop through evapo-
transpiration and shading from
the plant cover.
2. Evapo-transpiration is the sum
effect of evaporation and plant
transpiration from the surface of
the vegetation that results in the
cooling of the surface as water
evaporates from it.
3. Reductions of up to 90% in
solar gain on roof area shaded
by plant cover compared to un-
shaded location can be
achieved and indoor
temperature decrease of 3-4˚C
(6-8 ˚F) may be attained (Peck,
2008).
15.
16. • 2 x 200mm thick concrete slabs, each 4
metres maximum span, on load-bearing
perimeter walls of 300mm aerated concrete
blockwork and two internal columns
running from ground to roof (key location
points for walls in the flexible internal
apartment layouts).
• A 400mm high concrete upstand surrounds
the slabs. Drainage outlets placed at 3 – 4
metre intervals were reduced in number in
the final construction.
• Two layers of bituminous, heat-welded
waterproof membrane were applied to
minimise potential for leaks.
• 19mm of sand was spread over the
bituminous layer as a bed for butt-jointed
concrete pavers providing mechanical
protection against garden implements.
Christie’s walk garden, adelaide
17. • A proprietary polyethylene mesh (rather
than heavy gravel) was laid as a drainage
layer.
• Geotextile was laid on the mesh
followed by a thin layer of sand.
• Finally, 350mm of growing medium
(lightweight soil) was blown up on to
the roof through a kind of giant vacuum
cleaner.
• Clay pavers have been used to deliniate
between pathways and growing spaces.
An irrigation system of microsprays
keeps it watered with recycled water
during summer, twice a week.
• There is a bottomless metal container,
with lid, which holds worms that are fed
once or twice a week with veggie scraps.
• A small pond with water plants has been
added – to attract birds as well as
allowing small children (under
supervision) to dangle their feet.
18. Benefits
• Expand roof life 2x3 times
• Reduce air-conditioning cost
• Stormwater management
• Improve public relations
• Transform dead space into
garden space
• Reduce city “heat island”
effect
• Reduce smog and improve
air quality
• Reduce noise
• Reduce energy demand
• Improves aesthetics
19. DISADVANTAGES
• Structural limitations
• Installation and maintenance costs are high.
• Susceptible to damage and leakage.
• The limited number of plants.
• An increase in weight load.