Safely repair the wood for any deck or joist
Repairing a small area of your deck can save you time & money. If a cosmetic issue, remove the plank, flip and refasten. If repairing a damaged joist, support the deck on one side of the deck or it could crash, and match the wood replacement with similar type pressure-treated lumber. This guide will teach you to safely repair any deck or joist.
WHAT YOU NEED FOR THIS PROJECT
Remove nails or screws from the damaged decking board using a pry bar, screwdriver or drill. If the fasteners won't come out, chop the board into pieces with a chisel or saw, pry up the slivers, and replace.
Inspect the joists underneath for signs of rotted wood. Repair and reinforce joists that have soft, discolored areas with rotted wood putty.
Use a hammer and chisel to remove any rotted portions of joists.
Apply a thick coat of clear sealer to the damaged joist. Let it dry, and then apply a second coat of sealer. Cut a reinforcing joist from pressure-treated lumber.
Treat all sides of the reinforcing joist with a clear sealer and let it dry. Position the reinforcing joist tightly against the damaged joist, and attach it with 16d (3.5") galvanized nails driven every two feet or fasten it with 3 1/2-inch galvanized deck screws.
Attach the reinforcing joist to the ledger and header joist by toenailing with nails or screws. Cut replacement deck boards from matching lumber, using a circular saw.
If the existing decking is gray, "weather" the new decking with a solution made from 1 cup of baking soda and 1 gallon of warm water. Apply in the solution with a scrub brush. Rinse and let dry.
Use wood stain that is the same color as the rest of the deck and apply stain to both sides of the board and the edges.
Position the new decking and attach it to joists with galvanized deck screws or nails. Make sure the space between boards matches that of existing decking.