Strengthen Floor Joist Ends
My 1st floor joists rest on a center steel i-beam. The joists overlap and rest on the beam but there is no bridging where they meet and many of the joist ends are cupping which creates an uneven floor along the center of the house (dipping). I looked online to see if there were small inexpensive jack screws that I could put between the joists but I really didn't see anything that would seem to work better than putting wood cut to size to prevent further cupping. I am not interested in bringing the joists completely vertical, just some insurance against further cupping.
Any ideas would be much appreciated.