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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 '16 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. – James Olson Nov 25 '16 at 3:11
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  1. maybe 18. hard to tell without knowing how many monkeys and typewriters are needed.

for the love of god, phrase your question intelligibly. what tolerance are you asking for? width? height? span? material? youngs modulus? what on earth do you mean by how far out in height?

garbage in, garbage out

  • You're right. My question was not clear. I shouldn't type while tired! I'll edit it shortly. – Laxmidi Jan 14 '17 at 20:12

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