I am very unfamiliar with the whole insulation thing and am looking to build a home with PD...
I was thinking of going up to either; Ceiling 3.5 and Walls 2.0 OR Ceiling 4.0 and Walls 2.5
Read this for insulation recommendations for different climates:
http://www.yourhome.gov.au/technical/pubs/fs47.pdf
Read this article:
http://forums.envirotalk.com.au/Insulat ... t7876.html