Our house has a single floor joist that has been sistered running down the center of the kitchen. Sounds great except for the part where all the other floor joists have sagged a little bit and now there's a nice ridge in the middle of the floor.
Any recommendations on how to fix the issue?
Best Answer
If the rest of the joists are sagging, the answer is pretty clear. They should be sistered also. Joists sagging badly enough to create a visible depression are in danger of failure (or at least must bounce with comical severity).
Post some photos if you'd like more specific advice.