Green Roof Ppt

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Transcript of Green Roof Ppt

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INTRODUCTION 50% of world’s population living in a metropolitan areas - 60% expected by 2030 due to population growth

80% of global carbon dioxide emission attributed to cities

Urban heat island effect - increased energy requirement - increased smog formation

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Definition:-

A green roof is a roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane. It may also include additional layers such as a root barrier and drainage and irrigation systems.

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NECESSITY OF GREEN ROOF The groundwater resources in India are

greatly diminishing by several centimeters

per year and are not being replaced. As

global warming becomes more and more of

an issue, and towns and cities expand,

green space is becoming more and more

important. Green roofs are particularly

useful at filtering out pollutants from the

air and as such, purifying it.

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TYPES OF GREEN ROOF

Green roofs are generally categorized as:-

(i) Extensive

(ii) Intensive

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EXTENSIVE GREEN ROOF

Extensive Green Roofs are well suited to roofs with little

load bearing capacity and sites which are not meant to be

used as roof gardens.

The growing medium, typically made up of a mineral-

based mixture of sand, gravel, crushed brick, leca, peat,

organic matter, and some soil, varies in depth between 5-

15 cm

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Extensive green roofs are often not accessible and are

characterized by:

• low weight,

• low capital cost,

• low plant diversity, and

• minimal maintenance requirements.

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Extensive Green Roof

EXTENSIVE GREEN ROOF

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INTENSIVE GREEN ROOFThese roof are also referred to as high-profile – They look like

traditional roof gardens because a much wider variety of plant

material can be included since growing media depths are increased.

These roofs generally require more effort for the tending of plants,

whereas the term extensive roofs call for a more passive approach.

The growing medium is often soil based, ranging in depth from 20–

60 cm.

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Intensive green roofs are often accessible and are

characterized by:

• Deeper soil and greater weight,

• Higher capital costs,

• Increased plant diversity, and

• More maintenance requirements

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INTENSIVE GREEN ROOF

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COMPARISON OF EXTENSIVE &

INTENSIVE GREEN ROOF

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Extensive Green Roof Intensive Green Roof

Maintenance Low High

Irrigation No Regularly

Plant communities Moss-Sedum-Herbs and

Grasses

Lawn or Perennials, Shrubs

and Trees

System build-up height 60 - 200 mm

150 - 400 mm on

underground garages > 1000

mm

Weight 60 - 150 kg/m2 180 - 500 kg/m2

Costs Low High

Use Ecological protection layer Park like garden

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SYSTEM OF GREEN ROOFComplete systems

Modular systems

Precultivated vegetation blankets

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COMPLETE SYSTEM

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MODULAR SYSTEM

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PRECULTIVATED VEGETATION BLANKET

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CONSTRUCTION OF GREEN ROOF

Points to be Considered Before Installing a Green Roof

(i) SLOPE

(ii) CLIMATE

(iii) STRUCTURE

(iv) MATERIALS

(v) WATERPROOFING LAYER

(vi) DRAINAGE LAYER

(vii) GROWING MEDIA

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BUILDING OWNER BENEFITSEnergy savingsRoof membrane protection and life extensionSound insulation PUBLIC BENEFITSUrban heat island effect Storm water retentionReduction of dust & smog levels

PRIVATE BENIFITSIncresed roof lifeReduced noise levelsHeat shield

BENEFITS

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The main limitation of green roofs is the higher initial

cost.

Some existing buildings cannot be retrofitted with certain

kinds of green roof because of the weight load of the

substrate and vegetation exceeds permitted static loading.

Depending on what kind of green roof it is, the maintenance

costs could be higher, but some types of green roof have little

or no ongoing cost.

LIMITATION OF GREEN ROOF

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ROOF GARDEN vs. GREEN ROOF

A roof garden is actually very different from a Green

roof, although the two terms are often and incorrectly used

interchangeably. A roof garden is an area that is generally

used for recreation, entertaining, and as an additional

outdoor living space for the building's residents. It may

include planters, plants, dining and lounging furniture,

outdoor structures such as pergolas and sheds, and

automated irrigation and lighting systems. A roof garden re-

establishes the relationship between man and nature that can

be lost in urban environments.

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COST Given various assembly types and project descriptions

costs can range from Rs.5500/- Sq.m. to Rs.6900/- Sq.m.

or more. These figures include membrane through plants.

Cost per square meter depends on many factors:

i) The size and slope of the roof,

ii) Depth and complexity of the system,

iii) Height and accessibility from the ground,

iv) Cost of labor, and need for specialized elements,

such as drains, railings, pavers, slope stabilization

measure, etc.

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MAINTENANCEMaintenance activities that must be performed on a green

roof are weeding, replanting, and inspections of the waterproof membrane.

Depending on whether the green roof is extensive or intensive, required plant maintenance will range from two to three yearly inspections to check for weeds or damage.

Eventually, after 30-50 years, the membrane will have to be replaced.

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Green roofs provide numerous benefits to the building itself as well as the environment and society as a whole, but lack widespread awareness.

Future developments in materials and installation techniques should lower upfront costs, but further subsidies are needed to make the technology accessible to the general population.

In present state as land is becoming scarce in urban areas, storm water drainage problem is growing, and energy prices are increasing for building heating and cooling, green roofs are becoming increasingly viable.

CONCLUSION

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CONCRETE SLAB

DRAINAGE LAYER (SHINGLE - 0.05m)

WATERPROOFING LAYER(0.01m)

FILTER LAYER (PUMICE STONE - 0.02m)

GROWING MEDIA (0.08m)

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VEGETATION,PLANTS

DRAINAGE SYSTEM(P.V.C. PIPE)

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Material Cost Unit

Waterproofing0.01m

Rs. 100/- Sq.m.

Pumice stone0.02m

Rs. 175/- Sq.m.

Shingle0.05m

Rs. 500/- Sq.m.

Soil0.08m

Rs. 50/- Sq.m.

Elephanta Lawn0.02m

Rs. 270/- Sq.m.

P.V.C. pipe0.02 m(diameter)

Rs. 20/- L.S.

Plants Rs. 80/- Nos.

Tray Rs. 1200/- Nos.

Total = Rs. 2400/- Sq.m

Labour 10% Rs. 240/-

Transport 5% Rs. 120/-

Overhead 5% Rs. 120/-

Total = Rs. 2880/- Approximately Rs. 3000/-

Sq.m

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Any question?

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GREEN ROOFPrepared By:-

0701031 – SACHINDRAKUMAR P. MISHRA

0701032 – SWAPNIL S. MOHITE

0701033 – NILIMA S. MORE

0701034 – TEJASWINEE V. NAIK

0701035 – KETAN S. NAVALE

0701036 – YOGESH P. PAREKH

0701037 – KARAN K. PATIL

0701038 – MUKESH V. PATIL

0701039 – DNYANESHWAR S. PAVASKAR

GUIDED BY:-

PROF. S. V. CHAUDHARI

SUPPORTED BY:-

PROF. R. B. RAO