What is an acceptable tolerance for floor joists (subfloor not laid, yet) over a 4 ft span in an old home? How far out (in height) is acceptable?

  • What is it that you are trying to do? There is a lot more info needed than your question provides
    – Jack
    Nov 25, 2016 at 0:11
  • Sounds like Laxmidi is asking min. dim. of FJ over a 4'0" span. A Hem.Fir. / Pine 2x4 would be fine @ 16" center (spaced apart). Though anything less than 2x6 would make me uncomfortable re: deflection. Nov 25, 2016 at 3:11


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