Max Floor Joist Span

This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction. Joist span and spacing is set by your local building code. True floor joist span calculations can only be made by a structural engineer or contractor.

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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.

Max floor joist span.

Maximum floor joist span for no. Span calculator for wood joists and rafters also available for the android os. While most residential construction uses 2x8 joists with 16 inch spacing there are many other factors you need to consider when determining the proper joist span length. 1 psf lb f ft 2 47 88 n m 2.

1 ft 0 3048 m. Floor joist span tables for various sizes and species of wood. Joist span table use these tables to determine floor joist spans based on grade of lumber size of joist floor joist spacing and a live load of 30 lbs ft 2 or 40 lbs ft 2 these tables can also be used to determine deck joist span. 2 grade of douglas fir are indicated below.

Live load is weight of furniture wind snow and more. Dead load weight of structure and fixed loads 10 lbs ft 2. Also available for the android os. 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.