Abstract
Green roofs have become an ecological solution in cities with the environmental problems that have increased in recent years. Green roofs are used as aesthetic elements as well as their ecological benefits for the city and urban environment. Comparative measurements were performed through field study in Landscape Architecture Department, Faculty of Forestry, Istanbul University, Green Roof Research Station (IUGRRS), to produce quantitative data on this subject and investigate the thermal properties of a typical extensive green roof. This paper analyses the thermal properties of a typical extensive green roof in comparison with a bituminous membrane roof (reference roof). During measurement period, it has been confirmed that a typical extensive green roof with 50 mm-thick growing media provided a thermal protection to the building envelope against extreme temperature effects. Impacts of extreme temperature fluctuations on the surface of the green roof to the building envelope were reduced by the green roof system by 79%. Results obtained from the field measurements show that green roofs are a sustainable choice in Istanbul climate conditions. Key words: Green roofs, field measurement, thermal benefits, urban environment, Istanbul climate.
Highlights
Roof gardens, more commonly known as green roofs in European countries, are gaining foothold in North America while widely popular and established in European countries especially Germany, France, Austria, Norway and Switzerland (Wong et al, 2003)
This paper aims to investigate the thermal properties of a typical extensive green roof in climate conditions of Istanbul through comparative field measurements in IUGRRS
We have found that a typical extensive green roof can provide a significant temperature reduction to the envelope of the building
Summary
More commonly known as green roofs in European countries, are gaining foothold in North America while widely popular and established in European countries especially Germany, France, Austria, Norway and Switzerland (Wong et al, 2003). Research studies show that green roofs have thermal benefits in building and urban scale (Kumar and Kaushik, 2005; Santamouris et al, 2007; Fioretti et al, 2010; Susca et al, 2011; Liu, 2004; Lazzarin et al, 2005). This natural solution contributes to the thermal benefits in buildings and their surrounding environments (Wong et al, 2003). Green roofs can significantly reduce energy use in buildings with poor
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