What is the lining meant to achieve? If you just want to exclude damp then
heavy duty polythene damp proof membrane will achieve that. If you want to
insulate the walls to retain heat then you need Kingspan or similar wall
insulation bats, and you will also need to insulate the roof. If you are
planning on having a felt covered wooden roof then don't use cheap shed
felt, get heavy duty roofing felt.
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