Retrofitting housing with lightweight green roof technology in Sydney - Australia and Rio de Janeiro - Brazil

Wilkinson, S; Feitosa, RC

Retrofitting housing with lightweight green roof technology in Sydney - Australia and Rio de Janeiro - Brazil

Wilkinson, S

Feitosa, RC

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Publisher:: ZEMCH Network
Publication Type:: Conference Proceeding
Citation:: Mass customisation and sustainability in housing Proceedings, 2014, pp. 114 - 127
Issue Date:: 2014-06-06

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Field	Value	Language
dc.contributor.author	Wilkinson, S https://orcid.org/0000-0001-9266-1858	en_US
dc.contributor.author	Feitosa, RC	en_US
dc.contributor.editor	Hirota, EH	en_US
dc.contributor.editor	Formosa, CT	en_US
dc.contributor.editor	Onyango, J	en_US
dc.date	2014-06-04	en_US
dc.date.issued	2014-06-06	en_US
dc.identifier.citation	Mass customisation and sustainability in housing Proceedings, 2014, pp. 114 - 127	en_US
dc.identifier.isbn	978-0-9910608-1-8	en_US
dc.identifier.uri	http://hdl.handle.net/10453/35456
dc.description.abstract	The built environment contributes around half of all greenhouse gas emissions and 87% of residential buildings the UK will have in 2050 are already built (Kelly, 2009), there is a need to adopt sustainable retrofit for existing residential buildings. Furthermore these statistics are broadly similar across many countries. The question is; what are viable solutions? One answer may be to retrofit with green roofs as there are environmental, economic and social benefits. Environmental benefits include potential reductions in operational carbon emissions, reductions in the urban heat island, increases in bio-diversity, housing temperature attenuation and reductions in stormwater run-off. Economically, benefits are reduced roof maintenance costs and lower running costs. The social gain is the creation of spaces where people have greater access to nature. However there are barriers to the adoption of retrofitted green roofs; which include perceptions of structural adequacy, risk of water damage, high installation and maintenance cost, as well as access and security issues. In some locations the intent will be to reduce cooling loads, whereas others will desire thermal insulation, or will seek reduction in stormwater run-off. The ability to meet the demands will depend on budget and physical characteristics. Many Australian and Brazilian residential buildings have profiled metal sheet roofing which is a lightweight material with poor thermal performance During summer periods Sydney as well as Rio de Janeiro temperatures can reach 45 degrees Celsius and rainfall patterns are variable and changing. This research reports on an experiment on two small scale profiled metal sheet roofs in both cities which aimed to assess thermal performance. One roof was planted to compare performance to an unplanted roof. The findings are that considerable variation in temperature were found in both countries indicating that green roof retrofit could lower cooling energy demand considerably.	en_US
dc.publisher	ZEMCH Network	en_US
dc.relation.ispartof	Mass customisation and sustainability in housing Proceedings	en_US
dc.relation.ispartof	ZEMCH International Conference	en_US
dc.title	Retrofitting housing with lightweight green roof technology in Sydney - Australia and Rio de Janeiro - Brazil	en_US
dc.type	Conference Proceeding
utslib.location	Londrina, PR, Brazil	en_US
utslib.location.activity	Londrina, PR, Brazil	en_US
utslib.for	1205 Urban and Regional Planning	en_US
dc.location.activity	Londrina Brazil
dc.location.activity	Londrina, PR, Brazil
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/e-Press
pubs.organisational-group	/University of Technology Sydney/Faculty of Design, Architecture and Building
pubs.organisational-group	/University of Technology Sydney/Faculty of Design, Architecture and Building/School of Built Environment
pubs.organisational-group	/University of Technology Sydney/Strength - CCDP - Contemporary Design Practice
utslib.copyright.status	open_access
pubs.consider-herdc	true	en_US
pubs.finish-date	2014-06-06	en_US
pubs.place-of-publication	Londrina, PR, Brazil	en_US
pubs.publication-status	Published	en_US
pubs.start-date	2014-06-04	en_US

Abstract:

The built environment contributes around half of all greenhouse gas emissions and 87% of residential buildings the UK will have in 2050 are already built (Kelly, 2009), there is a need to adopt sustainable retrofit for existing residential buildings. Furthermore these statistics are broadly similar across many countries. The question is; what are viable solutions? One answer may be to retrofit with green roofs as there are environmental, economic and social benefits. Environmental benefits include potential reductions in operational carbon emissions, reductions in the urban heat island, increases in bio-diversity, housing temperature attenuation and reductions in stormwater run-off. Economically, benefits are reduced roof maintenance costs and lower running costs. The social gain is the creation of spaces where people have greater access to nature. However there are barriers to the adoption of retrofitted green roofs; which include perceptions of structural adequacy, risk of water damage, high installation and maintenance cost, as well as access and security issues. In some locations the intent will be to reduce cooling loads, whereas others will desire thermal insulation, or will seek reduction in stormwater run-off. The ability to meet the demands will depend on budget and physical characteristics. Many Australian and Brazilian residential buildings have profiled metal sheet roofing which is a lightweight material with poor thermal performance During summer periods Sydney as well as Rio de Janeiro temperatures can reach 45 degrees Celsius and rainfall patterns are variable and changing. This research reports on an experiment on two small scale profiled metal sheet roofs in both cities which aimed to assess thermal performance. One roof was planted to compare performance to an unplanted roof. The findings are that considerable variation in temperature were found in both countries indicating that green roof retrofit could lower cooling energy demand considerably.

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