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Sustainability 2015, 7(1), 1081-1098; doi:10.3390/su7011081

Retrofitting Housing with Lightweight Green Roof Technology in Sydney, Australia, and Rio de Janeiro, Brazil

1
School of Built Environment, University of Technology, POB 123 Broadway, Ultimo, Sydney 2007, Australia
2
Department of Sanitation and Environmental Health of National School of Public Health, University of Sydney, Sydney 2006, Australia
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 26 July 2014 / Revised: 24 December 2014 / Accepted: 9 January 2015 / Published: 20 January 2015
(This article belongs to the Special Issue ZEMCH Research Initiatives: Mass Customisation and Sustainability)
View Full-Text   |   Download PDF [8468 KB, uploaded 24 February 2015]   |  

Abstract

The built environment contributes around half of total greenhouse gas emissions and with 87% of residential buildings that we will have by 2050 already built, it is vital to adopt sustainable retrofitting practices. The question is: what are the viable solutions? One answer may be green roof retrofitting. The environmental benefits include reduced operational carbon emissions, reduced urban heat island effect, increased bio-diversity, housing temperature attenuation and reduced stormwater run-off. The economic benefits are the reduced maintenance costs and lower running costs. The social gain is the creation of spaces where people have access to green areas. However, the barriers to retrofitting include the perceptions of structural adequacy, the risk of water damage, high installation and maintenance costs, as well as access and security issues. Many Australian and Brazilian residential buildings have metal sheet roofs, a lightweight material with poor thermal performance. During the summer, temperatures in Sydney and Rio de Janeiro reach 45 degrees Celsius, and in both cities, rainfall patterns are changing, with more intense downpours. Furthermore, many residential buildings are leased, and currently, tenants are restricted by the modifications that they can perform to reduce running costs and carbon emissions. This research reports on an experiment on two small-scale metal roofs in Sydney and Rio de Janeiro to assess the thermal performance of portable small-scale modules. The findings are that considerable variation in temperature was found in both countries, indicating that green roof retrofitting could lower the cooling energy demand considerably. View Full-Text
Keywords: green roof retrofitting; Sydney; Rio de Janeiro; thermal performance; residential buildings; housing; case studies green roof retrofitting; Sydney; Rio de Janeiro; thermal performance; residential buildings; housing; case studies
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wilkinson, S.; Feitosa, R.C. Retrofitting Housing with Lightweight Green Roof Technology in Sydney, Australia, and Rio de Janeiro, Brazil. Sustainability 2015, 7, 1081-1098.

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