Is the ceiling vapour sealed behind the MDF? I can see a load of foil tape behind the battens. You want to avoid condensation on the OSB.
Nope, it's just insulation then MDF. Where is the vapour coming from though? There's a vapour barrier externally, is that sufficient?
@hoefla started
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Is the ceiling vapour sealed behind the MDF? I can see a load of foil tape behind the battens. You want to avoid condensation on the OSB.