In Brisbane in summer the temperature is about 33 degrees and the humidity is about 70%. So the dew point temperature would be around 27 degrees. If your ceiling cooling…

I bought a brick veneer house recently that I was told (by the owner's ex-husband who had no financial interest in the property - divorced 30 years ago) was built…

For compliance with NCC section J (energy efficiency), you need R3.7 total if you're going for a simple DTS compliance method. That includes everything from the inside to the outside:
*the…