Look at this joist is warped, starts at 17.5" then to 14" with the small blocks to 17" at the end to the wall. Weird? It could haven't been originally built like that, so it must of warped, sloped the floor then they decided to fix it by installing the cross blocks? I'm jacking up the floor now, i bought 4 screw jacks today and need about 6-10 more. I have to support most of the floor joist it seems. Should i take out the old cross block and jam in new 15+" 2x6" in there and try to unwarp the beam? Maybe i should do this before i start jacking it up?