2x4 Floor Joist Span
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Span calculator for wood joists and rafters also available for the android os.
2x4 floor joist span. Dead load weight of structure and fixed loads 10 lbs ft 2. Also the type of lumber is important. I personally think it will be a bouncy floor. 1 psf lb f ft 2 47 88 n m 2.
Also available for the android os. Maximum floor joist span for no. Hem fir 2 joists with a live dead load of 40 10 psf. Live load is weight of furniture wind snow and more.
Most spans are typically 10 to 12 feet so we typically use 2x8 or 2x10. 2 grade of douglas fir are indicated below. Spans in this table were derived from the irc table r502 3 1 2 design criteria. If you use awc calculator 2x4 can span 6 2 with l360 deflection for decks 40lb ll.
This calculator shows 2x4 s limited to 5 8 span for eastern white pine. Shorten the span maybe to 5 and put them 12 oc or like mac said 4 16 oc. The depth or height of your floor joists depends on how far they can span without sagging. There are online span calculators available that tell you the maximum span for.
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