Ed21 Posted June 12 Share Posted June 12 (edited) 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 June 12 by Ed21 Link to comment Share on other sites More sharing options...
Canski Posted June 12 Share Posted June 12 Against the inside then a vapour barrier on the inside Link to comment Share on other sites More sharing options...
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