I used aircell insulation. Bunnings sells a variety of it. its under the colorbond roof and behind the colorbond walls. It does not retain heat.
The other day it was stinking hot and I thought I would see what it was like inside. I was pleased to find it was cooler inside than outside. I was going to put a whirlybird on the roof as well but that may make it hotter if the outside air was hotter than the inside air.
Its easy to lay as it comes in a roll. Well worth it. No fibreglass so no question about the fibres safety.
Greg.
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