I have a Cornish style property (First Floor has Roof tiles same as the roof)
Yesterday I went to add another power socket into one of our upstairs room (External Wall), I cut a socket sized hole in the wall and pushed out the Plasterboard to revel a void between the plasterboard and the roof/wall tiles. The Plasterboard is of a single thickness and has a silver backing on it. I'm not sure if its OK to install a plug socket with the back facing the void?
All the downstairs and internal walls are of a double skin construction so I haven't come across this issue before!
The foil back boards are creating a vapour barrier, which will help prevent condensation and damp spots.
If you wish to intall an outlet there, I would use a dry-ling back box and try seal the back of the box, it to prevent cold spots.
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