internal wall studs - 90mm or 70mm

folks, i need to insulate a few concrete walls. to do so, i need to attach a frame to the wall into which I will put the insulation. then gyprock over the top. insulation is 75mm thick so can i get away with 70*35 and just compress the insulation slightly? or should I be using 90 *45? if its the latter, how do i stop the insulatuion sagging into the extra 15mm void?





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