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Sort of - general timber frame for habitable space depends on stopping moisture get to the frame with a VCL under the wall sheathing - all taped and sealed up and not penetrated. You then have a breather membrane (tyvek) on the outside under the cladding which allows any vapour to escape and stops water getting in to the frame.
I think PIR plus foil taping all joins and over the frame itself is probably easiest here. (Leave an air gap on the cladding side ideally).
If you do seal it up you need air change (trickle vent )- to vent moisture that occurs internally (wet bikes etc).
Sheppz
So back to insulation, here is the internal shiz.
If I put PIR or wool slab between the framework and then 9 or 12mm plywood over the top am I going to create some kind of condensation trap that is bad?