I have most of the joists exposed now. The joists are 2 foot O.C. The first one (from left to right) is cracked, has been "sistered" with 1x4's on both sides, also had lumber added on top of joist to attempt to correct the sag in the joist. The second one has cracked and twisted, has about 5 different pieces of wood affixed where repair was attempted. The third is broken, but has another 2x6 nailed to it. The whole thing flexes about 2 inches when you step on it. The next 4 have various repairs tried, but are completely broken, have pulled away from the girder, only thing holding them up is the nails in the subfloor, and about a half inch setting on girder. To complicate things further, the main ductwork for the furnace runs parallel to the girder, and will interfere with whatever fix I do. I have had my furnace man in, we are looking at re-routing the ductwork, and I have a structural engineer willing to take a look and offer advice. I love this old house and it is certainly presenting a challenge and an opportunity to learn! I just don't think there's anything there that is worth trying to save. If I try it and it doesn't work, then all that time and $ would be wasted and I'd have to start over and replace it all anyway. I am leaning towards a repair with new lumber, and modern construction.