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In the enclosed half of my observatory it has 40mm gold bats between the outside corrugated colourbond and inside hardiflex.
In the enclosed half, many years later, I added Bradford Anticon between the roof struts and the corrugated colourbond (had to remove all the colourbond). Highly recommend this option, has worked very well.
I have intentionally not insulated the walls of the open half as they are largely shaded and radiate heat out very effectively.
Regards,
Roger.
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