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Yeah prebonded. Made more sense to me then doing it separately. I used 37.5mm siniat boards from selco. The prices sure have gone up though. https://www.selcobw.com/siniat-thermal-pir-tapered-edge-2400-x-1200-x-37-5mm
Which insulation did you use and was it pre bonded to the plasterboard? I really want to give this a crack