What's the best method to repair a floor joist that sags about 1"? I'll be working from the ceiling below and don't want to disturb the crown molding. After exposing the joist and making enough crosscuts 1/2 to 2/3 thru to jack up the joist, I don't know if sistering a slightly shorter joist on one or both sides will be sufficient or if a steel plate will be needed.
If the existing joist is simply warped, then I would think that sistering would do a perfectly fine job. But if the joist is sagging because of being loose on one end, or because of heavy load, you might find that sistering is not enough. I think I would sister on both sides of the joist and bolt, rather than nail, at several points - getting as close to each end as possible.
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