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So there's nothing I need to add, the foil on the celotex works as a barrier & the batons are kind of ventilated so shouldn't get too damp?

Hi I'm after advice on an insulation project I'm about to start. I've got an old mobile home with typical aluminum cladding then basic polystyrene boards between structural battens, then 2mm wood sheet walls. There is no vapour barrier fitted. I'm planning on adding celotex boards to the inside...