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is ther a alternative to iso 9 for insulating a attic as the price is extortionate iew 24 gb 420 sq mtr?
 

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ISO is on an increase right now. I believe it is petroleum based.

Why can you not use fiberglass? I know iso has better insulating properties thus needs less space to do it's thing but in an 8" rafter pocket you can acheive the same R value as ISO and still have 2" for air flow under the sheating. I am asuming this is a vaulted/cathedral ceiling.
 
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