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@BrickMan
Anyone any preference on brand/ varient with insulated plasterboard? Got a vapour barrier up so doesn't need one in it, though most inherently have that rating as the foil back PIR gives that (no?) anyways.
Old C19th thick stone building, 24" of stone, air gap then modern framing on external walls, lathe on internals (they are fine as is TBH), just the external and party wall I want to insulate well. No point going for mad 100mm <0.01w/m crazy stuff as rest of building is like a sieve (becoming less of a sieve room by room though). Around 30-55mm of insulation pir stuff likely going to make a noticable difference over the 1980's damp saturated thin plasterboard that was on there.