When the addition was built back in the late 60s, the lighter colored 2x10 was simply nailed to the darker colored 2x8 and the floor joists were nailed to the 2x10. Over the years, both the 2x10 and the floor joist have sagged. I added some bolts to strengthen the joint between the 2x10 and the 2x8. I also jacked up all the joists and added hangers on each one. Things are much more solid now.
At some point there were lag bolts added through the 2x10 and into the end-grain of the joists as well as some 2x4 joist hangers. Since the joists were not jacked back up before these things were done, the floor was still in pretty rough shape. Here you can see the joist has been jacked back up with the new 2x10 joist hanger attached using structural screws.
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