I have a wooden barn/garage with a metal roof over that already has a first floor in place. I would like to create temporary accommodation in this loft space for the duration of my newbuild.
The roof of the barn consists of celotex lodged between the perlins and metal sheets on top, nothing else. Air passes over the roof through the ridges of the metal sheets.
My question is, do I have to take the roof off and start again or could I work from the inside. If the breathable membrane is essential, could I ignore the first layer of cellotex and start over with a layer of BM, then cellotex and Fermacel boards?
The area concerned is over 150square metres and masses of headroom, so building up the layers inside works best for me. Is that possible ?

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