How to replace rotten wood on your outside deck like a pro.

Assess the damage:

Start by identifying the rotten boards. Prod the wood with a screwdriver. If it crumbles easily, it needs a replacement.  Determine the extent of the rot. You might need to replace more than one board, depending on how far the rot has spread. Once you have assessed the damage, gather the necessary tools and materials for the replacement. It’s essential to ensure that the new boards are properly treated to prevent future rot and extend the lifespan of your structure. Properly treating the new boards involves applying preservatives or sealants that protect against moisture and decay. This proactive step is critical to preserving the integrity of your structure over time.

I'm assessing the rotten wood that needs to be replaced

Tools and Materials:

• Pry bar
• You will need either a circular saw or a reciprocating saw.
• Hammer
• Drill (with appropriate drill bits for wood and fasteners)
• New deck boards (same size and type of wood as your existing deck, if possible)
• Screws (galvanized or stainless steel for exterior use)
• Wood chisel (optional)
• Sander (optional)

Steps to Follow:

The piece you want to replace

Remove the rotten boards.

Safety Alert: Make sure the rotten board is well-supported before removing it to avoid personal injury or damage to the surrounding deck structure.

Use the pry bar to carefully pry up the rotten board. If possible, start at the ends where the board meets the joists (support beams underneath).

If the board is stuck, use the reciprocating saw or circular saw to cut through the rotten section, making it easier to pry out.

Once the board is loose, remove any nails or screws holding it in place.

Prepare the installation site:

Inspect the joists (beams) underneath the rotten board. If they're rotten as well, they'll need to be replaced too. A professional may be the best person to handle this more complex repair method. If the joists are sound, use a wood chisel (optional) to remove any remaining rotten wood debris from the installation area.

Optional: You can use a sander to smoothen the area where the new board will sit.

Install the new deck board:

Measure the opening to ensure the new board will fit properly. Cut the new deck board to size if necessary. Once the board is cut, secure it in place using appropriate fasteners, making sure to leave space for expansion. Finally, sand down any rough edges to ensure a smooth finish and prevent splinters.

Pre-drill holes: Drill pilot holes through the new deck board to prevent splitting when screwing it into the joists. After pre-drilling the holes, align the board with the joists and insert screws to secure it firmly. Make sure to periodically inspect for levelness as you continue installing the remaining boards to maintain a uniform surface.

Fasten the board: Secure the new deck board to the joists using galvanized or stainless steel screws. This will ensure durability and resistance to rust, prolonging the life of your deck. Once all boards are in place, consider applying a sealant to protect against moisture and enhance the wood's appearance.

You have replaced the board.

Boards have been replaced

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Finishing Touches:

Once the board is secure, sand any rough edges and countersink the screws (drive them slightly below the wood surface). The removal will allow for a smooth finish when applying a stain or sealant.

Apply a coat of exterior-grade deck stain or sealant to protect the new wood and match the existing deck (optional).

All the Best,

Joseph Botelho

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