Our fifty year old, two story, house has a block foundation and the floor joists for the first floor are set in notches in the top of the block foundation wall. The foundation block was not originally water-proofed on the outside and the outside grading allowed water to saturate the block and the bottoms of some of the floor joists. Over time, the bottom corners of the joists softened leaving a bouncy floor. I've long since corrected the water problem (I installed a French drain around the house, coated the foundation wall, and re-graded, so the original water problem has been solved). I've also since supported the affected floor joists with a beam and floor jack arrangement. The floor is fine, but I never considered the fix to be a permanent one. What's the best way to permanently fix the sagging floor joists?