We want to insulate our lean to so as to make it a liveable room. Can someone tell me what the roof waterproofing membrane is in the attached picture and is it ok to put sheet insulation under it? In addition, what should I do with regards to ventilation as I hear some people say I need to have a 25mm gap between the membrane and the sheet insulation but do I need to do anything else? Thanks for any advice given.
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