Light-coloured roofs would be mandated on new homes on small lots in Melbourne’s growth areas under a proposed overhaul of the state’s housing code.
Dark roofs would be restricted on new homes in Victoria’s growth suburbs in a move aimed at reducing energy consumption and cooling the local climate on hot days.
The updated code would stipulate that “roofs must be finished with a colour or material with a light reflective value greater than 50”. A roof with a reflective value of zero would be pitch black and absorb all light, while a value of 100 reflects all light. Therefore, only lighter-coloured roofs would comply with the code.
The City of Wyndham in Melbourne’s outer south-west, has already taken its own steps to discourage dark roofs. The council’s 2040 plan, published late last year, includes “design guidance” for new housing that will, among other measures, “discourage dark roofs and encourage the use of light-coloured roofs to dwellings”.
Dr Timothy O’Leary, a lecturer at the University of Melbourne’s School of Architecture, Building and Planning, said a roof’s colour had a marginal overall effect on a home’s energy efficiency.
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