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Old 14-08-2018, 02:34 PM
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Paul Haese
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Join Date: Jan 2009
Location: Adelaide
Posts: 9,937
Hey Jen,

that is sarking which acts as a moisture barrier and not insulation. You use sarking in conjunction with insulation. The sarking keeps the insulation dry.

I note that aircell has been mentioned on IIS a few times. This is an insulation but not designed for use in roof structures. It adds to thermal impact in walls where there is tilt up panels.

I would recommend either glass wool with sarking or polyester insulation (more expensive but lasts forever and is made from recycles drink bottles) with sarking. You would need something like R2.5-R4 for effective reduction in summer temps.
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