Unsupported stud wall due to poor integrity of floorboards

[Kinso89]

Long story short, wetroom placed by previous owner has slow leaked. I've removed the wetroom shower base to expose the joists to help dry it out.

The floorboards run under the wall from the bedroom next door. The floorboard ends in the bathroom have rotted through damp and had to be cut. They were sat on noggins on the joist. This has left the wall , which sounds like a stud wall, unsupported at one end where the floorboards were affected.

How can I strengthen this area (highlighted blue on pic), now the floorboard ends have gone? New noggin into joist which extends to new edge of floorboard?

I can feel the floorboard under the wall extends 8.5 inches from the joist which leaves a gap of 3.5 inches from the next joist. Joist runs perpendicular to wall.

Thanks for any help

[big-all]

JxK answer was pretty good
as said its stage by stage remove say 1/3 at a time evenly space and added timbers to spread the load to the joist either side
i personally would try and get a wedge or two in to try and lift the stud 2mm clear[probably push the floor down] and alternative planks from each side to first or second joist the other side to spread the load

[aeromech3]

Sorry Big all I could not read your reference JxK, but I suspect you are saying cut alternate boards on the bedroom side and insert new longer sections to meet with existing noggins!
Am I reading this right, the stud wall is still sitting on the wood floorboard ends which extend 8.5" from the last joist in the bedroom floor, for a lightly loaded stud wall that is not a disaster if there is not panting of the bedroom floor when walked on. You could lower the existing noggins to be able to slide a short support plank under the floor ends and use wedges, if you need, to take up slack space But if the wall is ceramic tiled then don't lever up as it might cause the corner grout to crack.
My experience as a DIY, if the sole plate of the dry wall extends a good way into the bathroom beyond the shower base it is not going anywhere.

[big-all]

https://www.diynot.com/diy/threads/floo ... st-5287319