2x4 Floor Joist Span

1 ft 0 3048 m.

2x4 floor joist span.

Joist span and spacing is set by your local building code. Check out this free calculator or consult floor joist span tables for what you are doing. When building a house or even a deck it is important to confirm you have the correct joist sizes spans and spacing before you get started. While every effort has been made to insure the accuracy of the information presented and special effort has been made to assure that the information reflects the state of the art neither the west coast lumber inspection bureau the american wood council nor its members assume any responsibility for any particular design prepared from this online span calculator.

I personally think it will be a bouncy floor. The problem you ll have with trying to use 2x4 s as floor joists is that most span tables don t include 2x4 s. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Also the type of lumber is important.

The depth or height of your floor joists depends on how far they can span without sagging. Doesn t interfere with plumbing or wiring in joist bays. Use a temporary 2x4 post at the midpoint of the span to support the joist until the adhesive cures usually in 24 to 48 hours. Shorten the span maybe to 5 and put them 12 oc or like mac said 4 16 oc.

Most spans are typically 10 to 12 feet so we typically use 2x8 or 2x10. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. All floor joist tables start with 2x6 lumber. This means that it will be hard for you to convince your planning department to approve your plans without some sort of proof that the 2x4 s are adequate.

1 psf lb f ft 2 47 88 n m 2. 2 grade of douglas fir are indicated below. There are online span calculators available that tell you the maximum span for. Dead load weight of structure and fixed loads 10 lbs ft 2.

Live load is weight of furniture wind snow and more. If you use awc calculator 2x4 can span 6 2 with l360 deflection for decks 40lb ll. Also available for the android os. Span calculator for wood joists and rafters also available for the android os.

Bottom edges of joists must be free of wires pipes and ducts. View joist rafter tables.