Deck squeaks
A squeak is two surfaces moving against each other. On a deck that is almost always a board against a joist, or a joist against a hanger — and the fix depends on which, which is why adding screws at random rarely works.
Locating it
Squeaks are directional: they happen when weight moves in a particular way. Walk the deck slowly and note exactly where your foot is when it sounds. Then:
- Press with a hand, not a foot. A squeak that needs body weight is structural; one that responds to hand pressure is usually a board moving on a joist.
- Have someone else listen from below, if the deck is elevated. The sound travels down, and the location from underneath is much more precise.
- Mark the joist line with chalk. Most squeaks are within 2″ of a joist, because that is where the fasteners are.
The four causes
| Cause | Sound | Fix |
|---|---|---|
| Board rubbing on joist | Sharp, rhythmic | Screw through the board into the joist from above |
| Loose hanger | Metallic creak | Refasten or replace the hanger, from below |
| Joist movement at the beam | Deep groan | Add blocking or a joist hanger at the beam |
| Railing post moving | Creak when leaning | Blocking and through-bolts at the post base |
Fix 1: screw from above
The simplest fix, and the one that works for most board-rubbing squeaks. Drive a screw through the board into the joist, 1″ in from each edge, at the point where the squeak happens. Use a screw long enough to get 1½″ of thread into the joist.
Do not over-drive. A screw that pulls the board tight against a joist that is slightly crowned will create a new squeak on the other side of the crown.
Fix 2: shim from below
If the deck is accessible underneath, a cedar shim driven between the board and the joist at the squeak point fixes it without a hole in the surface. Tap it in until it is firm, snap it off, and check. This is the best option for a deck with a finished underside or a visible soffit.
Fix 3: hangers and blocking
A metallic creak usually means a hanger is loose — the nails have backed out or the hanger was never fully seated. From below, refasten with the manufacturer's specified fasteners, or replace the hanger entirely. Adding blocking between joists at the mid-span often eliminates a group of squeaks at once by stopping the joists from rotating independently.
Fix 4: the railing
If the creak happens when you lean on the railing rather than when you walk, it is not a decking problem. The post is moving at its base, which means the anchorage is inadequate. Blocking inside the rim and through-bolts are the fix; see railing installation.
Things that make a squeak worse
- Do not sprinkle powder or lubricant into the gaps. It quiets the sound for a month and attracts dirt, and it does nothing about the movement.
- Do not add screws everywhere. Twenty screws in the wrong place makes a stiffer deck that still squeaks, and it gives you twenty holes to deal with at the next refinish.
- Do not ignore a deep groan. A joist moving at the beam is a structural symptom, not an annoyance.
What this page will not fix
- It does not fix a structural defect. A deck that moves as a unit has a bracing or connection problem; see deck loads.
- It does not cover composite decking, which squeaks differently and often needs the manufacturer's clip system checked.
- It does not estimate repair cost — most of these fixes are under $20 in materials.
- It does not identify the squeak; that requires being there.
Questions people actually ask
How do I stop my deck from squeaking?
Find the exact spot first, then screw through the board into the joist at that point, or shim between board and joist from below if the deck is accessible. Random extra screws rarely fix it.
Why does my deck squeak when I walk on it?
Two surfaces are moving against each other, almost always a board against a joist or a joist against a hanger. The location of the sound tells you which.
Is a squeaky deck dangerous?
Usually not — a board-on-joist squeak is cosmetic. A deep groan when weight shifts can mean a joist is moving at the beam, which is worth inspecting from below.
Can I fix deck squeaks without removing boards?
Yes, from underneath with shims, or from above with a screw driven at the squeak point. Both work without removing decking.