low profile deck using 2x4 joists by: editor - rich bergman 2x4 joists would be sufficient depending on close they are spaced (no further than 12" on center, maybe even a bit closer) and how long the 2x4s will span from one support beam to the next. 2x4s can not span a very long distance without starting to bend.
deck joist sizing and spacing. the layout term for joists is “on center,” which is the center-to-center measurement from one joist to the next. most decks use 16" on center spacing for joists. most decking is not strong enough to support longer spans than 16". some builders reduce joist spacing to 12" on center to strengthen the deck
compare brands and shopping results for 2x4 brackets for framing from mysimon.com. mysimon.com has the best deals and lowest prices on 2x4 brackets for framing
use the four pieces of 2-by-8 (g and h) to make a square frame that measures 34 ½ inches per side. attach the boards to each other using two construction screws in each corner. this will serve as
if he hits you, you’ll catch on fire and have to run to the nearest fire extinguisher (marked on your map) to put out the flame. continue down the hallway, defeating enemies as you go. when you get to the next area, an enemy will use his burning 2x4 to activate the sprinkler systems and short out travis’ katana.
if you are allowed to use 2x4's for the joists, it'll cost you more money than using 2x6's would. the 2x4's won't span as far, so you would need more beams (and more footings) to support them. and your math on the beam spacing isn't adding up. 3 beams spaced 5' apart total 10'. add 2' of overhang on each side and that makes the deck 14', not
ignore the destination icon leading to samuel and instead visit the other cliffside building, which has half its interior barricaded. to reach that area, simply climb onto the roof, look for a cliff ledge to safely drop onto, and smash into the middling 2x4 barricade. the prize: the final bone charm and coins (3769/3794).
without seeing the exact plan for you deck it not possible to say with certainty. the wider (deeper) the joist the more load it can support with deflecting. 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.
all floor joist tables start with 2x6 lumber. if you use awc calculator 2x4 can span 6'2" with l360 deflection for decks 40lb ll. i personally think it will be a bouncy floor. shorten the span maybe to 5' and put them 12" oc or like mac said 4'- 16" oc.