span entries are listed for 2×6 through 2×12 joists and 12 in., 16 in., and 24 in. on-center spacing. 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
in general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. a 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet. the larger the deck, the larger the joists. 2x6 joists should only be used on ground-level decks that do not require, and will not provide for, any guards.
which is better for deck flooring: 2x6 or 1x6 deck boards? ask question asked 8 years, 7 months ago. an other option if you have wider joist spacing is to add a joist between each one if possible, then you can use 1x wood or even better, composite decking that will last a very long time, low maintenance and you can have your choice of
the joist span indicates that 2x6s at 24 o.c. would be adequate for this span. for beam 1, use a joist length of 13, 6 7 and a post spacing of 9. the beam table indicates that the beam may be two 2x10s or two 2x12s, depending on the wood used. for beam 2, use a joist length of 7 and post spacing of 9.
what is the safe spacing of 2×6 deck joists to support a 3500 dead load of a sp this topic has 50 replies, 19 voices, and was last updated 4 years, 6 months ago by ethanb . viewing 20 posts - 1 through 20 of 51 total
the cantilever overhang can be 1/4 the joist length, but again i would keep that to 2'-6 max. for 2x8. deck loading has a tendency for the people to gather at the railing. deck loading has a tendency for the people to gather at the railing.
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. joist span and spacing is set by your local building code. you should check with your local building department for construction requirements in your area.
deck joist cantilever rules and limits. the distance your joists can safely cantilever or overhang a drop beam is determined by the size of the joists, the wood type and grade of the lumber and the spacing between joists. many building departments limit joist cantilevers to 24' maximums. you must use at least 5 framing nails to attach
re: deck joist size i use all 2x6's for joist max span is 7'. the strength of a deck is in the post and footings. it has nothing to do with joist span. long joist span allow for way too much flexing of the wood due to severe climate and humidity changes. decks require a bunch of post and beams. those who hang decks off of houses have no foresight.
the quick answer is yes you can use 2x4s with deck blocks to support your decking. and yes if you do choose to use 2x6s you would have to carefully set that deck block a bit lower into the soil to keep the deck surface level. but i would tell you that using 2x4s as joist is problematic.
spacing the same 2x10 joists 16 inches on-center produces a much stronger deck the safety margin increases to about 79% beyond the minimum requirement , but at what cost? this spacing requires four more joists, or about 44% 4/9 more material; at $16 each for the extra joists and hangers, the added cost is about $72 depending on prices in your location for material only.
in other words, when you put weight on the deck, the joist won't bend. the usual solution for dealing with undersized joists is to use more of them, spaced closer together. so, for example, instead of 16' spacing with 6' joist, you may have to go to 12' spacing with a 4' joist.
following are tables for the two most common required psf loads for 16 inch joist spacing. all of the tables are based on the use of 2 grade lumber. table 3 is for 40 psf live load and 10 psf dead load on 16 inch joist centers. table 4 is for 60 psf live load and 10 psf dead load on 16 inch joist centers.
refer to the decking span table to determine what is the maximum distance that your chosen decking can span between joists. for example 2x6 materials can usually span 24 without any noticeable deflection and still support a significant load.
lag screws or bolts joist hanger deck joist 1-5/8 min to 5 max existing wall sheathing deck joist existing floor joist ledger board hold-down or similar tension devise located in at least 2 locations, within 24 of each end of deck. min of 1,500 lb stress design capacity for each device existing fully threaded 3/8 diameter lag screw.
well, my 2x6 joists are spaced the maximum recommended 16 inches on-center on the new deck and 12 inches on-center on the refurbished one. although the joists span about 6 inches farther on the former than on the latter and add a cantilever, this still sets up an easy, if unscientific, comparison.
your deck will look better and youll avoid the frustration of trying to splice the decking over joists. a splice board will also require extra framing. do it the same way you would for the perimeter boards one extra joist and a 2×6 on its side between the outside joist and the extra joist .
floor joist table joist size joist spacing maximum span 2 x 6 12 on center a 9 2-2x4 2-2x6 2-2x6 2-2x6 2-2x8 2-2x10 2-2x10 2-2x12 2-2x12 n 10