Floor Joist Spacing For Deck

What is the proper placement.
Floor joist spacing for deck. Unlike interior floor joists you also have to take into account the direction and size of your decking. If the joists are not all the same exact height the deck s surface will be uneven. Decks get wet and may be framed with incised treated lumber so spans may have to be adjusted. 2x10 to 15 feet and 2x12 to 18.
A lot of questions revolve around joists when it comes to building a deck. On dec 17 2019. In general terms joists spaced 16 inches on center can span 1 5 times in feet their depth in inches. The maximum distance a deck joist can span between supports is determined by the joist s dimensions and species as well as the spacing between joists.
Choosing wood for your joists. A 2x8 up to 12 feet. For example a 2 x 12 joist placed 16 oc. It s common sense that the less space there is between joists the sturdier your deck will be.
There are three basic measurements used for floor joist spacing. This spacing requires four more joists or about 44 4 9 more material. Ready to start calculating how much lumber you ll need for your joists. There are also several floor joist sizes and types used.
The table includes spans for. Maximum joist spacing for decks southern pine deck joist maximum spans no cantilever with cantilever joists may cantilever up to of the actual adjacent span. To learn more about deck joist sizing spacing and allowable span reference this chart. Properly spacing floor joists when framing an addition or whole structure is largely a factor of building codes.
Use the joist span and spacing calculator below to plug in your desired type of wood the size of your joists and the required spacing between each joist. How do i keep them even. The right spacing depends on the. However if you space your joists too close together.
Labor to cut and. Proper spacing for floor joists written by connor doe on nov 29 2010. The closer the joists are to. But the 2015 irc included a new one table r507 5 that will make it easy for deck builders to spec a joist size for a given span and joist spacing.
Until a few years ago the irc didn t have deck joist span tables. How far apart are floor joists placed. Although building a deck seems straightforward there are a few important design factors to keep in mind. At 16 each for the extra joists and hangers the added cost is about 72 depending on prices in your location for material only.
If the floor joists that span the length of your deck are installed too far apart the boards on top will sag.