How to Replace Deck Screws

Step 1: Confirm replacing the screws is the right fix

1. Walk the deck and mark boards that move, squeak, or lift at the joists.
2. Look for screws that are backed out, spinning in place, rusted, snapped, or missing.
3. Press on the problem area and check whether the board itself is still solid and whether the joist below feels firm.
4. Compare a few existing screws so you know the head style and approximate length before buying replacements.

If it works: You have confirmed the looseness is coming from failed deck screws, not from a rotten board or damaged framing.

If it doesn’t: If the board is cracked through, soft, badly split, or the joist below is loose, repair the wood problem first instead of just replacing screws.

Step 2: Set up the area and remove the failed screws

1. Clear furniture, rugs, and debris away from the repair area so you can work safely.
2. Put on safety glasses.
3. Use the correct driver bit and back out each loose or damaged screw slowly to avoid stripping the head.
4. If a screw head is stripped, try firm downward pressure with the best-fitting bit before moving to the next screw.
5. Pull any screw that comes out partially bent or heavily rusted instead of trying to reuse it.

Step 3: Check the hole and choose the new screw location

1. Inspect each old hole in the board and joist for wallowed-out wood, splitting, or rot.
2. If the old hole is still tight and the wood is sound, you can usually reuse that location.
3. If the hole is enlarged or the screw used to spin, shift the new screw slightly to one side so it bites into solid wood.
4. Keep the new screw far enough from the board edge and from other screws to reduce the chance of splitting.
5. Use your tape measure to confirm the replacement screw length is appropriate for the board thickness and framing below.

Step 4: Drive the new deck screws and pull the board tight

1. Push or step the board down so it sits flat on the joist before driving the new screw.
2. Drive one new exterior-rated deck screw at a steady speed until the board is snug to the framing.
3. Stop when the screw head sits flush or just slightly below the board surface without crushing the wood fibers.
4. Replace the remaining failed screws one at a time along the loose section.
5. If the board still moves between fasteners, add replacement screws at the original fastening points where needed and where the wood is still sound.

Step 5: Finish the surface and check for a consistent hold

1. Run your hand carefully over the repaired area and make sure no screw heads are left proud of the surface.
2. Sweep away metal shavings, splinters, and debris.
3. Look down the board line to confirm the repaired board sits level with the surrounding boards.
4. Tighten any nearby screws that are starting to back out so the repair area wears evenly.

If it doesn’t: If the board still sits unevenly after the screws are replaced, check for warped decking or framing issues that screw replacement alone will not correct.

Step 6: Test the repair under real use

1. Walk across the repaired area several times with normal body weight.
2. Shift your weight near each replaced screw location and listen for squeaks or feel for movement.
3. Check again after a day or two of normal use to make sure the screws stayed tight and the board did not lift back up.
4. Replace any remaining obviously rusted or loose screws nearby before they create the same problem again.

If it works: The board stays tight, feels solid under foot, and the repair holds during normal use.

If it doesn’t: If movement returns quickly, the old diagnosis was incomplete and the board, joist, or fastening pattern needs a closer inspection.