For a deck framed from 2x10s i d assume maximum spans of about 14 feet for joists and 10 feet for beams.
Post spacing for deck roof.
This generally yields a maximum tributary area of about 70 square feet.
Decks with a lot of angles may also require additional footings.
While a typical deck under 6 feet in height may only require posts set every 5 to 8 feet the type of deck the type of wood the height of the deck and a variety of other factors can influence the spacing of the support posts.
It provides more stability for larger decks the ability to hold a heavier load and more room for notching.
Cut the posts at this line.
A double 2x12 beam can span 12 feet.
In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.
While there may be a handful of circumstances that only require the minimum 4 4 deck post you will more than likely want to choose a 6 6 post for the deck.
I wouldn t blink at the use of 4x4 posts up to 8 feet in length.
Most decks use 16 on center spacing for joists.
A 4 by 10 can usually span up to 12 feet between posts.
If you have the ledger board installed you can use it as a guide.
If you are planning on installing a hot tub or porch on top of your deck you will usually need more footings and posts to support the additional loads.
Starting with your perimeter mark the location of each deck post to locate the fitting position.
Building a deck might sound like a fairly straightforward task that anyone can accomplish but there are a variety of elements that go into the planning stages to ensure the safety of the deck upon completion.
Deck post spacing depends on numerous elements.
Some builders reduce joist spacing to 12 on center to strengthen the deck frame or to increase maximum allowable joist spans.
Some builders position them every 4 feet for a completely rigid frame.
Most decking is not strong enough to support longer spans than 16.
In general posts should be spaced no more than 8 feet apart.
Joist spacing for composite decking.
If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts.
A 2 2x10 can span 10 feet and so on.
Measure down from the door leading to the deck the width of the beams joists boards plus at least 3 inches or to whatever your local code requires.
Then snap a chalk line at this level along all the posts.
When supporting joists that span 12 feet with no overhang beyond the beam a double ply beam can span in feet a value equal to its depth in inches.
For most situations you will want to place footings and posts less than 8 apart.
Beams can be solid lumber or be built from lengths of 2 by lumber nailed together with 1 2 inch pressure treated plywood spacers in between this forms a 3 1 2 inch thick beam that is equal to the width of a 4 by post.
