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.
Floor joists for deck.
For a more rigid feel 12 or less may be preferred.
That means these joists can span the 12 foot depth of the deck and the beam can be located at the perimeter.
Deck joists have a different maximum span length depending upon the size spacing and framing material that you re creating your deck with.
If adding additional framing be sure to keep all boards level and in plane across the tops.
The finished floor is then installed on top of the subfloor.
The subfloor is the decking installed on top of flooring joists.
For best results refer to our wood and composite deck joist span table.
The thickness of plywood panels in a subfloor is regulated by the.
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.
The larger the deck the larger the joists.
Nine joists will be needed for the 16 foot width.
Here s a helpful chart covering the most popular wood framing species and their maximum allowed spans.