Squeaky Floorboards: What Causes Them and How They Get Fixed

A squeaky floorboard starts as a small annoyance and slowly becomes something you plan around. You learn which board makes the noise. You step over it on the way to the kitchen at night. You warn guests about the one outside the bedroom door.

Squeaks are rarely a sign that anything is structurally wrong. But they are a sign that something down there is moving when it shouldn’t be, and the noise almost always gets worse rather than better if it’s left alone.

Here’s what actually causes floorboards to squeak, and what it takes to stop them.

What a Squeak Actually Is

A squeak is friction. Two things are rubbing against each other under load, and the sound you hear is that movement.

That’s it. There’s no single “squeak fault” — just a range of situations where something has come slightly loose and now shifts when weight passes over it.

Understanding which type of movement you’re dealing with matters, because the fix is completely different depending on the cause. This is why generic advice like “just add more nails” often does nothing at all.

The Most Common Causes

Boards Rubbing Against Nails

This is the classic. Over years, the timber around a nail shaft compresses and works loose. The nail no longer grips firmly, so when you step on the board it moves a fraction of a millimetre up and down against the metal.

The sound is usually a short, sharp chirp that happens right as your weight lands, and again as it lifts.

Nails are especially prone to this because they hold by friction alone. Screws bite into the timber and hold far better, which is why modern installations use them.

Boards Rubbing Against Each Other

Timber expands in humid weather and contracts in dry weather. Over many seasons, the tongue-and-groove joints between boards wear slightly, and the boards begin to rub along their edges.

This squeak tends to be longer and more of a groan than a chirp, and you’ll often hear it across a run of boards rather than one specific spot.

Melbourne’s climate makes this common. The swing between humid summer stretches and dry, heated winters puts timber through a full expansion and contraction cycle every year.

Gaps Between the Boards and the Joists

Floorboards sit on joists — the structural timbers running underneath. If a joist has bowed, twisted, or dried out slightly, a gap can open between the top of the joist and the underside of the board.

When you step on that section, the board flexes down to meet the joist, then springs back when you move off. That deflection is what makes the noise.

You can often identify this one by feel. There’s a slight give or bounce underfoot, not just a sound.

Movement in the Subfloor Structure

Sometimes the problem isn’t the boards at all. In older homes, stumps settle at different rates, bearers sag under sustained load, and joists can twist as they age. Once the frame below starts moving, everything above it moves too.

Squeaks from structural movement are usually widespread rather than isolated. If half the rooms in the house creak, the issue is more likely below the floor than in it.

Moisture Changes and Seasonal Movement

Poor subfloor ventilation keeps timber damper than it should be. Damp timber swells; when it eventually dries, it shrinks back — and it doesn’t always return to exactly where it started.

A telltale sign here is seasonality. If the squeaks appear reliably in one part of the year and fade in another, moisture is involved. That’s worth investigating properly, because the ventilation problem behind it causes more serious issues than noise over the long run.

Poor Installation

Some floors squeak from the beginning. Common causes include boards fixed at the wrong spacing, insufficient fixings per joist, no expansion gap left at the walls, or timber that wasn’t allowed to acclimatise to the room before installation.

A floor that squeaked within the first year of being laid was almost certainly installed poorly. That’s a different conversation to a floor that developed squeaks after fifteen years of use.

Finding the Source

Before anything can be fixed, you need to know where the movement is.

Walk it slowly. Move across the room at half your normal pace, shifting weight deliberately onto each foot. Mark every board that makes a noise with a small piece of tape.

Get someone to help. If there’s access underneath — a subfloor crawl space or a basement — have one person walk above while the other watches from below. You’ll often see the exact board lifting off the joist, which takes all the guesswork out of it.

Note the type of sound. A sharp chirp usually means nail movement. A longer groan usually means boards rubbing. A dull thud with visible give usually means a gap at the joist.

Check whether it’s seasonal. If you can remember when the squeaks started or noticed them coming and going, that’s useful information for whoever ends up fixing it.

How Squeaky Floors Get Fixed

Fixing From Below

Where there’s access underneath, this is the best option by a wide margin, because nothing on the finished floor surface is touched.

The common approaches are driving shims or wedges into the gap between the joist and the board to remove the void, adding a supporting block alongside the joist to give the board something solid to bear on, or fitting a bracket between joist and board.

Done properly, a fix from below is invisible and permanent. The limitation is access — homes on concrete slabs or with sealed subfloors don’t offer it.

Fixing From Above

Without underfloor access, the work has to happen from the top.

The standard approach is to fix the board down into the joist with screws, countersunk below the surface and then filled and finished so they disappear. This only works if the screws land in the joist itself — a screw driven into the gap between joists holds nothing and can make the squeak worse.

There are also specialist screws designed to snap off below the surface once tightened, which leaves a very small hole to fill. These are effective on hardwood floors where a visible fixing would be obvious.

The important detail: fixing from above always leaves some mark, however small. On a floor that’s due to be sanded and refinished anyway, this is a non-issue. On a recently finished floor, it needs a careful hand.

Lubricating the Joints

Where the squeak comes from boards rubbing against each other rather than a gap or a loose fixing, working a dry lubricant into the joint can reduce the friction. Talc, graphite powder, or a purpose-made floor lubricant are all used.

Be realistic about this one. It reduces the noise, it doesn’t fix the underlying looseness, and it usually needs redoing. It’s a reasonable holding measure, not a solution.

Repairing the Structure

When the cause is a sagging bearer, a settled stump, or a twisted joist, no amount of screwing boards down will help. The frame has to be corrected first — re-stumping, packing or replacing a bearer, or sistering a new joist alongside a damaged one.

This is bigger work, but it addresses the real cause. It’s also the point where professional timber floor repairs are worth arranging rather than attempting a patch.

Fixing Ventilation and Moisture

If moisture is driving the movement, clearing blocked subfloor vents, improving drainage away from the house, or adding ventilation is part of the repair. Fix the squeak without fixing the moisture and it will come back.

What Doesn’t Work

A few things get suggested often and rarely help:

• Adding more nails. Nails are what came loose in the first place. More of them repeats the problem.
• Putting a rug over it. Muffles the sound slightly, changes nothing underneath, and the movement continues to worsen.
• Filling gaps with wood filler. Filler is brittle and has no structural strength. It crumbles out under repeated movement within weeks.
• Screwing blindly into the floor. Without knowing where the joists run, most screws hit nothing and simply add holes.
• Laying new flooring over the top. Any movement underneath transfers straight through. A new floor over a squeaky subfloor will squeak too.

Does a Squeak Mean Something Is Wrong?

Usually not. Most squeaks are a maintenance issue rather than a structural one — a nail that’s worked loose, a joint that’s worn, ordinary movement in a floor that’s been walked on for decades.

There are situations worth taking more seriously, though. Squeaking that appears suddenly across a large area, that comes with visible sagging or a sloping floor, that’s accompanied by a damp or musty smell, or that appears alongside cracks in nearby walls all point to movement in the structure rather than the surface.

In those cases, the noise is a symptom of something else and the floor is telling you to look underneath.

Preventing Squeaks in a New Floor

If you’re having a floor installed, most of the risk is avoidable:

• Let the timber acclimatise on site before installation
• Use screws or secret-nailing appropriate to the product, at the correct spacing
• Make sure the subfloor is flat before anything goes down
• Leave proper expansion gaps at the perimeter
• Confirm subfloor ventilation is adequate before the floor covers it
• Fix any existing subfloor movement first, not after

The last two are the ones most often skipped. Both are far cheaper to deal with while the subfloor is still exposed.

Worth Getting Looked At

A single chirping board in a hallway is a small job. Widespread creaking across multiple rooms is a different situation, and the right fix depends entirely on what’s causing the movement.

If your floors have started making noises they didn’t used to, it’s worth having someone look at the subfloor rather than guessing. Get in touch with our team and we’ll tell you what’s actually going on down there.