HowToDIYDecks.com is supported by readers and may earn an affiliate commission.

How to Install Deck Joists

Step-by-Step Guide: Installing Deck Joists for a Sturdy and Safe Deck

Installing deck joists is an important step in building a sturdy and safe deck. Deck joists are the horizontal beams that support the deck boards and transfer the weight of the deck to the support posts. Here are the steps to install deck joists:

Step 1: Determine the Joist Spacing
The first step in installing deck joists is to determine the spacing between them. The spacing will depend on the size and type of the deck boards you are using. Typically, the joist spacing should be no more than 16 inches on center for most decking materials. Check with your local building codes to determine the minimum requirements for joist spacing.

Step 2: Mark the Layout
Using a chalk line or a straight edge, mark the layout of the joists on the ledger board. Make sure the marks are straight and evenly spaced.

Step 3: Cut the Joists
Cut the joists to the appropriate length using a circular saw or a handsaw. Make sure the ends are square and even.

Step 4: Install the Ledger Board
Attach the ledger board to the house using lag screws or through bolts. Make sure the ledger board is level and securely attached to the house.

Step 5: Install the Joist Hangers
Install joist hangers on the ledger board at each mark. Make sure the hangers are level and evenly spaced.

Step 6: Install the Joists
Slide each joist into the hangers and secure them with joist hanger nails or screws. Make sure the joists are level and evenly spaced.

Step 7: Install Blocking
Install blocking between the joists to provide additional support and prevent the joists from twisting or warping. Cut the blocking to size and secure it with screws or nails.

Step 8: Install Bracing
Install diagonal bracing between the support posts and the joists to provide additional support and prevent the deck from swaying. Cut the bracing to size and secure it with screws or nails.

Step 9: Install the Deck Boards
With the joists in place, you can now install the deck boards. Make sure the boards are straight and evenly spaced. Secure them to the joists with deck screws or nails.

In conclusion, installing deck joists is an important step in building a safe and sturdy deck. By following these steps, you can ensure that your deck joists are properly installed and provide the necessary support for your deck.