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Thanks again It says 100mm but then says 35mm under drawn - what does under drawn mean. Sorry to be such a dumbo.

thanks so will 100mm insulation be enough

We are converting our integral garage into a bedroom. It has a flat roof - what thickness and type of insulation should we use between the joists. They are 150mm deep and if my research is right we have to leave a 50mm space between roof and the start of the insulation. I hope this makes...