I am absolutely flabbergasted! After assuming for many years that my home's roof space was well insulated with batts (and receiving an energy audit that indicated there was no problem with that), I found out today that large parts of the roof space have little insulation.
The only reason I found out was because a pest inspector went through the entire roof space to check for rats (yes, he found evidence of some, but luckily not many yet). He told me the renovated area of the house and the area around the manhole had the batts, but the older parts of the house only had the original fluff insulation which was thin in some areas.
To me, someone only installing batts around a manhole area is intending to deceive the householder, as looking in through the manhole one would assume the rest of the roof space had similar insulation. Certainly, both the energy auditor and most householders would tend to look in from the manhole to check out the insulation.
This installation job would have been done well before the Federal Government's insulation program, and so clearly this kind of deception is a longstanding problem.
It makes me furious that after all the other efforts I've made to reduce my greenhouse gas emissions, this really basic area that I thought had been covered (no pun intended) had not been done properly.