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if you’re ready to start planning the building phase of your new deck, this guide contains everything you need to know about whether to choose 4×4 or 6×6 posts for a deck. size of the deck. according to building codes, there is no clear answer on when you should install a 4×4 vs. 6×6 deck post.
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.
my front deck (480 sq) has 2x6 decking and the rear deck (300 sq) has 5/4 decking, both 16" on center. you will get most of any bounce on a deck from the span/size of the joists, not the decking, so one up your joists for a sturdy deck. quality wise, i prefer the 5/4 decking. it doesn't seem to check as easily as the 2x.
q instead of supporting decks with treated 6x6 posts, is it okay to assemble support columns using four treated 2x6s instead?. a dick hackbarth, p.e., a structural engineer in st. paul, minn., responds: there’s nothing inherently wrong with building up a 6x6 column out of four 2x6s, as long as you can keep water out.
i'm wondering if there are any specific pros or cons for using the same 2x6x10' boards, vs. 1x6 deck boards? of course i realize that the 1x6 boards wont support the same amount of weight as the original boards, but i think the 2x6's might have been a bit overkill anyway.