the posts should be a minimum 4×4 size and be solidly anchored to the deck joist and rim joist of the structure. use two through-bolts and a metal tension tie for the upper bolt connection. if a decks guard-posts anchoring does not have a minimum allowable tension load of 1,800 lbs. for a 36-in. maximum railing height, they should be replaced.
4x4 cedar posts around the edges 4 foot intervals , sitting on concrete footings; posts are notched and are supporting the rim joists, attached with nails; there are no other supporting posts or beams; deck extends about 8 feet out from the house; deck is about 4 feet off the ground for one section, and 2 feet off the ground for the other section
a 4' x 4' is no stronger than a 2' x4' on edge. it could be a 10' x 4' but if you lay in the 4' way it's still not strong enough. now stand it up so the 10' way is up and down, and it's more than enough. don't allow your floor joist to span more than their height. example a 2' x8' deck joist should not span more than 8'.
in the past, many decks were built with 4x4 support posts also called structural posts . but these can bow seriously, even if a deck is only 3 feet off the ground. for that reason, we strongly recommend that you use 6x6s instead, even if your building department does not demand them. and if a deck is over 10 feet tall, you should install bracing.
in my region the building authority wont accept 4x4's for supporting decks only 6x6's. the only time 4x4's are allowed is for handrail posts. generally we will set the 4x4's at a height where they are about 2 or 3 inches down into the ground, not act as bearing but so we have nailing for the framework of lattice or fence board backers. then of course 36' or 42' up from the deck depending on the height,
the solution i personally like the best is to cut out a 4x4 hole in the decking and drop the entire 4x4 post on the inside of the deck frame. you can lag bolt from the outside of the frame into the 4x4 or even drill a hole for nut and bolt. to make it even better, you can beef up the framing around the 4x4 to suck it tight.
for larger porches, such as wrap around porches, you will want to make sure that the support is more than you need. step 2: measure for posts. large 8 x 8 posts are necessary for the use of supporting a porch roof. while many like to use the smaller 4 x 4 posts, they can tend to warp after they have been standing under the weight for several
according to the old af and pa table, a 4-foot douglas fir 4x4 post can support 256 square feet of deck. using the 2005 nds, i calculated that the same post can support 231 square feet, so it would seem there's no problem using 4x4s to support, say, an average-sized intermediate stair landing.
can i use 4x4's for deck support beams? i am building a deck and have used 4x4's as posts cemented into the ground. now that i'm to the beam-stage, i'm wondering why you can't use 4x4's as the beams rather than use multiple 2x stock with plywood spacers or some other combination .
ez post top and bottom mounts are used ez post top and bottom mounts are used when an ez handrail kit is cut into 2-sections to fit between existing posts and can be secured into many types of posts or walls. fasteners are included for attaching the mounts to wood metal or concrete structures.
use a radial, or chop saw to cut the piers to length. this assures a square cut that allows the beam to rest more completely on the end of the pier. these piers are 4' pressure treated peeler cores. you could also use pressure treated 4'x 4' posts.
depending on the size of the structure you want to build you will probably use 4 x 4 posts with 2 x 8 beams for a ground level deck design with or without a couple of steps or 6 x 6 posts and 2 x 10 beams to support the weight of a bigger and higher deck design structure.
step 2: measure for posts. large 8 x 8 posts are necessary for the use of supporting a porch roof. while many like to use the smaller 4 x 4 posts, they can tend to warp after they have been standing under the weight for several seasons. measure the distance between the bottom of the porch roof and the top of the ledger beams of the porch.
the foundation of a deck and the way it's connected to the deck itself is critical to making them last for decades under the right conditions.
6x6 or 4x6 is a heavier looking post and most people find it looks better; a 4x6 or 6x6 gives you more meat to work with room to make mistakes or move anchors and still have a strong post; you can also make decorative cuts or hang plants from the 6x6 and not give up necessary strength
a short 4x4 can carry an awfully big load, and many deck builders use 6x6 posts as a standard, regardless of the height or load of the deck. though the height of a deck is often questioned only in regard to the requirement for guards, it is a factor in determining the height or span of the posts.
if you install your posts inside the rim board you will lose some of your deck space. the width of the post plus the width of the rim board will be lost to your deck railing system. if using a 4 x 4 that will be about five and a half inches, for a 6 x 6 make it seven and a half inches.
i am helping a buddy build a pergola/arbor this weekend and was wondering if the ot would use 4x4's or 6x6's as the posts. it will be about 10x10 so probably not too heavy. the 4x4's will support what you are buliding but after a few months will start warping from the sun and before long look like a damn boomerang. 6 x 6 will look a lot
in general, the maximum span for a 4-by-6 beam is 6 feet between 4-by-4 posts. if you move up to 4-by-8, you're usually allowed to span up to 10 feet between posts. a 4-by-10 can usually span up to 12 feet between posts.