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not incorrect - the BCA standard only applies to new homes and homes constructed after 2003. See section four - table 1 of the following link after you have determined your climate zone: http://www.environment.gov.au/energyefficiency/insulation/homeowners/guidelines.html#five also...

check http://www.environment.gov.au/energyefficiency/publications/index.html#climate - there are climate maps that determine which R rating suits your area. this is the recommended R rating under the govt. scheme - don't believe a word you have been told by installers etc. trying to flog...