In the process of converting my old stone built barn into a workshop, I've replaced the tin roof with new box profile fixed the rotten sections of sarking and put new felt on. I am wanting to insulate the line the inside of it, it is stone built it but is dry and damp free there is new concrete floor to go in yet aswel.
I have been thinking of OSB (stirlingboard) then painting it white but not sure on insulation.