Well, I can't find anywhere nearby that stocks the Kingspan AIR-CELL which is suitable to the situation ("Insulshed"). Bunnings has the "Insulbreak" variant which would do, but is $342 for twice the quantity I need and wouldn't provide the stiffer advantage of the Insulshed.
My local hardware has the CSR Bradford Anticon, R1.3 55mm, basically Siselation with 55mm fibre bat on one side. The quantity is perfect, 18m2 when I need 16m2, and $115. Price is very appealing. So, I think I'll be buying that on the way home today (along with appropriate tape and wire).
Roger.
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