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we have taken down the plaster board in our loft bedroom it had bits of fibreglass insulation which we are replacing with kingspan sheets the rafters are 100mm/ 4 inch what size kingspan can we use to keep enough air flow between tiles and insulation?

We have 2 bedrooms in the loft in our new house built in 1970 but had crap artex on walls and slopping ceilings so decided to pull the plaster board walls and ceilings down to replace insulation rewire and reboard , but noticed on the sunward side of the roof the felt under the concrete tiles...