Comprehensive study the potential of green roof system

Abstract

Green roofs have been recognized since ancient times in hot and cold climates . It is a passive cooling
technique that reduce incoming solar radiation inside of the building and can manage higher cooling in summer
and lower heating load in winter . Green roof has adopted as a specialized roofing system as a sustainable
technology .It can reduce indoor temperature by approximate 42 % and heat flux 40 % to 50 % as compared
to without green roof .Due to its specific quality 1/100 th
to 1/10 th of total amount energy can be saved annually .
Due to rapid economical growth many countries increasing urbanisation so the green area is continuously
decreasing . A liveable city should have 25 % greeneries of entire area .Vegetation is an important element for
succesful performance of green roofs . Green roofs play significant role in energy saving ,enriching the
biodiversity ,purifying the air pollutants , delaying the storm peak drainage system, improvement of water
runoff quality , filter the particulate matter from air ,to reduce urban heat islands ,generate aesthetic
skyscrapers ,decrease the air pollutions ,increase sound insulations, reducing traffic , balance the wildlife
habitat provision ,increase the drought tolerant ,solar radiation tolerant and life time of roofs .There is
relationship between performance of green roof and gross domestic product (GDP) .Green roofs can utilised
grey water of the building for irrigation . The albedo rang 0.7 to .85 is recorded due to green roofing . Green
roofs can reduce the need of air conditioning in summer season.To sustain the pleasant living conditions of
environment in urban area there should be the balance between green area and concrete built up area.