Replace damaged deck boards
Swap isolated worn boards while preserving a sound deck frame.
Lawn & garden · 3–6 hr · Medium
Before you start
Keep everyone off the opened area and never stand over a missing board. Stop for soft joists, loose ledger connections, widespread decay or unsafe access. Wear eye protection and control treated-wood sawdust; never burn treated offcuts.
Tools and materials
- Matching exterior decking, compatible corrosion-resistant deck fasteners and end-cut treatment
- Driver, nail puller, protective block, tape, square, clamped saw setup, spacers, gloves and eye protection
Check the problem
Separate board damage from frame damage
Inspect from a safe position. Isolated split or decayed decking may be replaceable; softness in supporting wood or loose connections stops this repair.
Match board and fasteners
Measure actual width, thickness and length. Match material and permitted span, and choose fasteners compatible with the wood treatment and environment.
Steps
Isolate the work area
Block access and plan a safe stance on intact decking. Identify all fasteners and support points of the full board being removed.
Remove the damaged board
Back out screws or pull nails using a protective block. Lift the full board without levering against weakened neighbors; stop if removal requires unsafe cutting.
Inspect the exposed supports
Remove debris and old fasteners from the joist tops. Confirm sound wood and sufficient bearing at each board end. Do not cover decay or improvise structural patches.
Cut and treat the replacement
Measure the opening and cut matching stock on a stable supported setup. Apply the required end-cut preservative and let it dry as directed.
Position and fasten
Set the board on every support. Follow the decking maker’s spacing for its moisture condition and fastener schedule; predrill ends where needed and seat heads flush, not deeply buried.
Finish and check
Confirm no proud fasteners, splinters, rocking or height mismatch. Finish when the wood meets the coating’s moisture requirements, then reopen the area only when complete.
Confirm no proud fasteners, splinters, rocking or height mismatch. Finish when the wood meets the coating’s moisture requirements, then reopen the area only when complete.
Tips
Do not hide soft framing
A new walking board cannot make a rotten joist sound.
Wet lumber changes size
Use the material’s spacing guidance rather than copying a random gap.
Expect a temporary mismatch
New wood may not match weathered boards even with the same finish.