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Yes, have tried that approach, I get a bit carried away at times though! The gripit undercutting tool is quite handy if you have a big enough hole https://www.screwfix.com/p/gripit-25mm-undercutting-tool/5333J?tc=IA6&ds_kid=92700048793290424&ds_rl=1249413&gclid=CjwKCAjwqIiFBhAHEiwANg9szom_q7AXyA8SCe-c2cU-ZwLZU5smsfbUYDm-b0PyYOLy5U7pedlixRoC7vcQAvD_BwE&gclsrc=aw.ds
Sam_w
I have the same insulated drywall, and only a 20mm cavity between it and membrane covered brick.
The solution to hanging heavy shit is using a decent sized drill bit at angles to eat enough insulation away so you can then anchor flat against the drywall. As long as you’re careful not to open the hole wider than you want when angling the bit, it gives you a nice bespoke cavity to anchor in.