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Where is the gap?

Ed21
in Heat Insulation

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I should know this, but a comment has created some doubts !!!

Bought a s/hand home office, more a glorified shed, that has a basic framework covered in stippled marine ply
and thinner ordinary ply on the inside. Present insulation is a very thin sheet of fibreglass stuck randomly between the timbers. 

Want to change this out for some PIR, but wondering where the gap should be?

PIR tight against the outside marine ply leaving an air gap between PIR and internal ply or 
PIR tight against internal ply leaving an air gap between outside marine ply an PIR? 

Which one do you reckon? 

Any help appreciated. 

Ed 
   
 

Edited by Ed21

Against the inside then a vapour barrier on the inside

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