Replacing a bad deck board.
If your deck boards are screwed down, simply unscrew the damaged board, cut a replacement to the same length, and screw it down with rustproof deck screws. It is best to replace entire boards. For stability and safety, a deck board should span at least three joists. If your deck boards are nailed down, the boards are quite tricky to remove without damaging the surrounding area and you may wish to enlist a service professional.
What you will need:
-- Tips courtesy of HomeAdvisor.com