Deck joists have a different maximum span length depending upon the size spacing and framing material that you re creating your deck with.
Floor joists for deck.
Nine joists will be needed for the 16 foot width.
The subfloor is the decking installed on top of flooring joists.
The bigger you make your deck the more you ask of the framing timbers that hold up the deck s structure and the joists and beams that support the deck s floor can only span so far before the.
Here s a helpful chart covering the most popular wood framing species and their maximum allowed spans.
I prefer to double the outside joists as do some deck builders which adds 2 joists for a total of 11.
In typical deck construction with a ledger on one side of the joist and beam on the other the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above.
Composite deck joist space.
For a more rigid feel 12 or less may be preferred.
The finished floor is then installed on top of the subfloor.
If adding additional framing be sure to keep all boards level and in plane across the tops.
Deck joist spacing should never exceed 16 on center with the exception of max deck boards which allow for maximum 24 on center.
That means these joists can span the 12 foot depth of the deck and the beam can be located at the perimeter.