280g Inwall

[MitchM]

Originally Posted by Delphinus

... Nevertheless I can put some more studs in place as you describe. ...

It doesn't need more studs (the vertical pieces that make up the wall), the wall should be shorter in height (the thickness of the top plate - 1-1/2"), blocks placed between the 2 joists above then the wall top plate screwed up into those blocks.

With the structure of the wall beneath those blocks, it will act as a support for the joists, and the added support will reduce the flex of nearby joists.

Mitch