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GIB removal, insulation installation, GIB relining

Hi , I’m looking for a rough quote for some GIB and insulation work. There are a number of areas around my ceiling with inadequately installed insulation (a skillion roof so can't access to reinstall insulation, but has been confirmed via thermal imagery). I’m looking for a quote to have GIB removed from roughly 20sqm of the ceiling (in total, it would be in different places around the house), have insulation reinstalled in these areas to code, GIB relined and plastered. The largest single area would probably be smaller than a full GIB sheet. A slightly unusual one, so please let me know if I can provide any further information. Just a rough ballpark estimate would be very useful for now if possible. Many thanks Marcus