old plaster?

[Thomas Johansson]

hello, I'm planning to renovate a room and knock down a partition wall to make the room larger.
A thought: I want OSB behind so there's something solid to screw into, but it will add a lot with OSB 11mm + 6mm renovation gypsum! Should I perhaps tear off the existing gypsum underneath first, otherwise it will probably be difficult to find the studs to screw the OSB board into!

 

[Demmpa]

If you tear down the old plaster, you can add some insulation in the wall as soundproofing between the rooms.