We chose fibreglass/glasswool insulation because of cost, and because I could not find any strong reasons to spend more on other products such as polyester or wool insulation. There were rumours that fibreglass insulation is a carcinogen, but this has been disproven.

In the roof we have R1.5 foil bonded with fibreglass batts and in the ceiling R3.5 fibreglass batts with a 50mm gap between them. This takes our roof/ceiling R value to R5.

In the walls we have R1 foil insulation plus R 2.5/3 fibreglass batts (a bit of each), with no air gap as there was not enough space. So R3.5 for the walls.

Find out more about insulation at the Your Home Technical Manual.

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