As the title says, I recently bought a home and am in the early stages of finishing the basement. However, after tearing down the old ceiling tile, I found that my floor had experienced water damage and that for some reason, the joists were cut and sistered using very short lengths (as seen in pics) My question is: how soon do I need to get this fixed and what kind of damage to my wallet can I expect?
I tend to answer in practical terms, and not in strictly code-compliant or legal terms. In cases like this, code doesn't really apply since it's old work and you're making improvements. We're only talking two joists, right? That's not so terrible.
- No, this repair was not done well. Short joist patches only work if they're fastened really well. These aren't.
- No, your floor won't immediately collapse (unless you store grand pianos or stacks of aquariums above).
- Yes, I would seek to fix the situation. Full-length sistering isn't normally too difficult. I'd do that, and take precautions such as temporary posts if you're removing lumber to fit new. The sting in your wallet will only be due to the crazy price of lumber at the moment.
Edited to add additional comments.
I agree with Isherwood answer to your questions. The extension is weak because it does not overlap the original cutoff joist enough and only 5 nails to connect the extension to the old joist.
Those short 2 x 6 on the inside are only to support the plywood platform to support the boards above. Most likely the ends of the boards were cut off because of the rot.
I would look into what caused the original water damage, as the second photo shows a watermark after the repair. Your comment about water damage on the joist rim maybe because their is still a leak.