I recently bought an older home (1895) and have all hardwood floors. In the second floor I have a floorboard that is split and sags as you walk on it. How can this be fixed? Reinforced?
Hardwood floor slat is split/sagging
floor
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Best Answer
I think the most likely cause is that a part of the subfloor has split/broken. You can attack this from below (messy!) or from above (hard to cut hardwood out nicely). The solution would be to support it from below, probably with lumber screwed between joists (though there are many ways to do it).
If on the off chance you have a joist that's bad enough to require jacking, I'd suggest you have a bigger problem, as joists don't "go bad" after 100 years.