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.
|