Osb or old particleboard behind the drywall?

[Olf Oggler]

I am renovating a 1970s house. The board material in the walls is particleboard about 12-13mm. Is there any disadvantage to keeping the particleboard and plastering over it? Or should one replace the particleboard with OSB? Particleboard has significant moisture movement. I thought that OSB might not move as much.

 

[BirgitS]

If you don't notice any problems with the chipboard now, it's likely there won't be any in the future either. Unless I misunderstand what you mean.

 

[Olf Oggler]

Where there is only particleboard without plaster on top, it moves a lot. It seems like any plaster on top would be affected by the movement of the particleboard.

 

[Johan Gunverth]

… Particle board has significant moisture movement. I thought OSB doesn't move quite as much.

Rather the opposite. Particle board on the wall is mounted edge to edge without expansion joint and sometimes edge-glued tongue. OSB often with an expansion joint. There's a reason that OSB 1200 is 1197mm. 😉
Keep the particle boards.