Hi to all and thanks to anyone who can help me with my question. I have done many hours researching and just cannot find the correct information. I live in a 1970 semi detached house and we have just started to renovate the house, I know there is no insulation in the flat roof and exterior upstairs walls. Here's what I have on the walls from outside in: Tile-batten-felt-75x50mm stud work then 12.5mm plasterboard. Should I leave a 50mm air gap between the felt and insulation boards the same as I would do inside the ceilings. Many thanks guys
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