Oct 17, 2012 · Framing, Flooring and Sub-Flooring - Jacking Floor Joists??? - I have a 1902, 25' x 40' house that has about 1-1/2 of sag in the center. A second story was added in 1975. I would like to level this, but would not start jacking without some good advice. Obviously, it would cause plaster cracking on the original first
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