Interior wall with steel studs - 45 or 70 mm with OSB and plasterboard?

[jimbomas]

Talked to a skilled salesperson at the building store. Went for 45*45 CC45 and OSB + gypsum on one side and just OSB on the other side where the wardrobe will stand. The wall is really sturdy, it was more than enough for this purpose.

The wardrobe consists of cabinets that will be mounted against and attached to the wall, so it will further stabilize it.

Thanks for all the tips and advice, this forum is really great!

 

[jimbomas]

Regarding stability, it's a wall in a bedroom/living room - not a wall in a stable or a gymnasium where balls are played against the wall. It should be able to handle someone leaning against it, and it should be possible to hang a shelf - not for someone to run full speed and throw themselves into it

Then it’s a sandwich construction with screwed OSB and gypsum on either side, which stiffens it up properly.
I personally have a platform (250 cm) that I use between two trestles to walk on when working on the house, and it has a frame of 45x45 studs with a cross-brace in the middle, an OSB of 11 mm that is screwed approximately c/c 200 mm. When I stand in the middle, it flexes a little but holds without problems. For a while, I considered putting an OSB on the underside for durability/stiffness, but it hasn't been necessary.

Putting a 45 or 70 mm stud is more because a 70 mm stud might not warp as much as a 45, but it isn't an issue if you screw the boards onto it relatively soon after taking them home from the lumberyard (then you should also choose carefully on the shelf so they are straight from the start...) and then to get more space between for (sound) insulation.
Another reason might also be if one has door frames of 120mm and not 95 mm.

Turned out perfect, screwed everything on the same day and selected the studs with care.