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The thermal performance of a green roofing system in comparison to the traditional ceramic tile roofing system

Grant number: 10/09149-9
Support type:Regular Research Grants
Duration: August 01, 2010 - July 31, 2012
Field of knowledge:Engineering - Civil Engineering - Construction Industry
Principal Investigator:Brenda Chaves Coelho Leite
Grantee:Brenda Chaves Coelho Leite
Home Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

Green roofing is been a part of the vernacular architecture for centuries as solution for constructions thermal regulation. It is known that they delay the heat transfer from the outside to the inside of the building, and during winter, they delay the heating loss from the inside to the outside of the building (International Green Roof Association - IGRA). By adopting green roofs in buildings, one assumes that there is economy in energy consumption to obtain conditions of thermal comfort in inner environments. Based on this assumption, an experimental research is being accomplished where, through a comparative study between two types of roofing systems: green and ceramics, it is intended to determine this energy saving potential. The analysis of the green roofing thermal behavior will be realized through data collection of environmental variables, during the period of one year, from an instrumented prototype to be constructed at the Polytechnic School of the University of São Paulo, São Paulo. The collected data will be compared to those of a second prototype with the same dimensions and equally instrumented, with ceramics roofing, under the same environmental conditions. The data comparison should prove the green roofing efficiency on retarding the building thermal gain and also, after diminishing the building surfaces temperature, the reduction of urban microclimate temperatures and the attenuation of the heat islands effects. After these benefits have been proved, a budget to the application in constructions of medium and small sizes will be done. One expects that the results will encourage the application of vegetated roofs, which will bring several advantages to the population. (AU)