I have a townhouse where the floor joist is divided right through about 0.5-1m out from a wall due to water pipes running there according to other townhouse owners. On the ground floor, I opened up 2 rooms into one large room and had to put up a beam across the room where the wall used to be because the ceiling started to sag slightly and become wobbly.
The beam solved the problem but it is still "wobbly" if you jump up there, and it was the same even when the wall was in place.
I have drawn with red lines approximately where the floor joist is divided. The width of that room is 3.6m from the interior wall to the exterior wall.
I have renovated the ground floor so I don't particularly want to tear up the ceiling there and go that route. Therefore, I thought that it might be possible to solve it from above since I'm going to remove that floor anyway as it is beyond saving.
Does anyone have any tips on a solution where you can stabilize the joists somehow, for instance, screwing and gluing floor chipboard as a base since it is probably just raw boards or something similar under the existing one? But can you strengthen the joists in some way too perhaps?
You probably need to do what you should have done before tearing down a load-bearing wall, i.e., bring in a structural engineer who can calculate how it can be solved based on the forces that the wall handled.
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