Kipper at sea wrote in news:77b2da60-93e5-400b-
:

timber shiplap boards, underneath is a layer of breather roofing
underlay all the way round and including the roof and floor.

Cool, so it's skin, underlay then insulation in that order. Have you put an
internal skin on the walls/roof or have you left the underlay exposed?

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All the best,

Chris