2x8 Floor Joist Span
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Span calculator for wood joists and rafters also available for the android os.
2x8 floor joist span. The rule of thumb is 1 of depth for each foot of run. In general terms joists spaced 16 inches on center can span 1 5 times in feet their depth in inches. 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. 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.
A 2x8 up to 12 feet. Spans in this table were derived from the irc table r502 3 1 2 design criteria. 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. When supporting joists that span 12 feet with no overhang beyond the beam a double ply beam can span in feet a value equal to its depth in inches.
Hem fir 2 joists with a live dead load of 40 10 psf. 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. 2x10 to 15 feet and 2x12 to 18 feet.
A 2 2x10 can span 10 feet and so on. Live load is weight of furniture wind snow and more. Ex an 8 foot window header should have an 8 4x8. A double 2x12 beam can span 12 feet.
1 ft 0 3048 m. Span calculator for wood joists and rafters available for the iphone. Maximum floor joist span for no. The same rule of thumb applies to door and window headers but you should use 4x wood.
Span entries are listed for 2 6 through 2 12 joists and 12 in 16 in and 24 in. Joist span and spacing is set by your local building code. Floor joist span tables for various sizes and species of wood. 1 psf lb f ft 2 47 88 n m 2.
The larger the deck the larger the joists. The illustrations one for cantilever joists and one for flush rim beam hung joists point out where joist span measurements are taken from the saddle of the ledger mounted joist hanger to the center of a dropped beam or saddle of the. True floor joist span calculations can only be made by a structural engineer or contractor. Dead load weight of structure and fixed loads 10 lbs ft 2.
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