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What to check, and in what order

My floor squeaks when I walk on it

A squeak is two surfaces moving against each other under load. When in the footstep it happens narrows it: on the way DOWN something is being pushed apart, on RELEASE something is springing back, and a squeak both ways is usually a nail or screw working in its hole.
  • 6Candidate causes
  • Most commonMost likely
  • No — candidates onlyA diagnosis

Where this starts

Floors squeak because something moves, and the movement is small — a fraction of a millimetre of one surface sliding against another is enough. The useful questions are what is rubbing and why it has room to.

THE TIMING IN THE FOOTSTEP is the most informative observation and costs nothing. Step slowly and listen. A squeak as weight goes ON is something being forced apart or down — a board lifting off a joist, a gap closing. A squeak as weight comes OFF is something springing back. A squeak in both directions is typically a shank moving in an oversized hole, which is the classic nailed-floor squeak.

WHERE also matters. A squeak in a line across the floor follows a joist; a squeak at one spot is a single fastener or a single board end; and a squeak near a wall is often a board bearing on something it should not be.

SEASON is the third axis. Timber shrinks in dry months, which opens the gaps that let things move, so a floor that squeaks every winter and quietens every summer is telling you the movement is moisture-driven rather than structural.

The distinction that matters for what to do: a squeak is almost always a nuisance rather than a defect. The exception is a floor that also FEELS soft or bouncy, which is a different problem with the squeak as a side effect.

What it could be, and what tells them apart

These are candidates to check against your own building, in the order they most often turn out to be the answer. None of them is a diagnosis of your situation.

  1. A board or subfloor sheet lifting off the joist

    Most common

    Squeaks as weight goes ON, often in a line following a joist, and frequently accompanied by a slight felt movement underfoot at that point.

    How to check: Have somebody walk while you watch the board's edge. Visible movement at a joist line identifies it.

  2. A nail or screw working in its hole

    Most common

    Squeaks in BOTH directions of the footstep, localised to one spot, often on an older nailed floor.

    How to check: Whether the noise comes on the way down and again on the way up. A shank moving in an oversized hole does both.

  3. Boards rubbing against each other

    Common

    A drier, higher-pitched noise from the board joints rather than from a fixing, worst in dry months and improving in humid ones.

    How to check: Whether it is seasonal. Timber shrinkage opens the gaps that let boards move against each other.

  4. A pipe or cable touching the structure

    Common

    A squeak or tick that follows the heating coming on rather than footsteps alone, sometimes with a clicking as the system warms.

    How to check: Whether the noise happens without anybody walking. A floor that ticks when the heating starts is a service, not a board.

  5. A joist rubbing where it bears or at a strut

    Less common

    A deeper noise from a wall line or the middle of a span, with movement felt across a wider area rather than under one board.

    How to check: Where the noise comes from relative to the walls. A squeak at a bearing is a different repair from one at a board.

  6. A floating floor with insufficient expansion gap

    Less common

    On a laminate or engineered floor, noise near the perimeter or at a doorway, often with the floor visibly tight against a skirting or a threshold.

    How to check: Whether the covering touches the wall anywhere. A floating floor pinned at its edges has to move somewhere else.

What to check, in order

The order matters — each step is here because of what it rules out for the ones after it.

0 of 5 checked
  1. 1

    On the way down, on release, or both — the three answers point at three different mechanisms, and nothing else separates them as cheaply.

  2. 2

    A line means a joist, a spot means a fixing or a board end, and a perimeter pattern means a floating floor is trapped. The pattern names the repair.

  3. 3

    A floor that squeaks in dry months and quietens in humid ones is moving because the timber shrank, which is normal and not a structural finding.

  4. 4

    It is the one finding that changes this from a nuisance to a structural question, and it is the reason to stop chasing the noise and look at the joists.

  5. 5

    Noise that happens when the heating starts is a pipe or cable against the structure, not the floor, and no amount of work on the boards will help.

The calculations behind this

Several of the causes above are a quantity that was specified or assumed. These compute them, with the formula and the standard behind each.

Deck Joist Span and Size Calculator →Laminate/Vinyl Plank Floor Underlayment Roll Calculator →Lumber Dimensional Size Calculator →

When to stop and get somebody in

  • Where the floor feels soft, springy or deflects noticeably underfoot as well as squeaking — the noise is a symptom of movement that is worth understanding structurally.
  • Where lifting a board reveals timber that is soft to a probe, discoloured or damp, which is decay rather than movement.
  • Where fixing the squeak would mean screwing blind through a floor with services beneath it — pipes and cables run in joist notches, and a screw through one is a considerably larger problem.
  • Where the floor is over a garage, an unheated space or a wet area and the squeak is accompanied by any sign of damp.

This page lists candidates to check, not a diagnosis — nobody has seen your building. If the symptom involves anything structural, read this first.