Hi darkshadow
I have a workshop with same roof, to get over problem of condensation,put strips of roof underfelt stapled to joist then cut jablite or similar to fit between beams then cover with ply. job done two years ogo on mine not a drop of damp since.
I have a workshop with same roof, to get over problem of condensation,put strips of roof underfelt stapled to joist then cut jablite or similar to fit between beams then cover with ply. job done two years ogo on mine not a drop of damp since.