I'm planning to close up a portal that was cut between the living room and an old bedroom. The opening is 170*210cm, and the wall is made of lightweight concrete blocks.
The problem I have is that the existing wall is 7cm thick, and I don't know how to close it up in a stable and good way.
45mm studs, OSB, and drywall are too thick (about 93mm), and building it up again with lightweight concrete blocks seems difficult to get right as well. I need to get the walls aligned on both sides to be able to wallpaper and make it look nice.
Does anyone have a good suggestion for a solution?
Best regards,
Tomas