Will Sanding Fix Squeaky Floorboards?

Usually no. Sanding removes a layer of timber and prepares it for a new finish. A squeak is generally a movement question. If a board rubs another board, moves around a fixing or flexes against something below, a smoother top surface does not remove the movement. Repairs and sanding can be planned together—but they are different line items.

First locate the sound, not the sander

The Australasian Timber Flooring Association’s explanation of floor noise names board-on-board rubbing, movement at nails, subfloor framing and even contact with door joinery as possible sources. That range is why “add more finish” or “sand it flat” is not a diagnosis.

With the room quiet, note where you step to produce the noise. Is it always one board edge? Does a larger patch flex? Is the sound beside a doorway or wall? Does it change with the season? Those observations help a floor specialist decide what to inspect. They are not proof of the cause; sound can travel through framing.

Different squeaks call for different work

A board edge moves under a foot

A traditional tongue-and-groove floor can make noise when adjacent boards rub. ATFA notes that even small movement at board edges can be audible, especially when a joint is loose. The repair has to address the movement or joint condition where practical; merely filling the surface gap may disguise it briefly without securing the board. ATFA’s technical note is the basis for this distinction.

A board moves around its fixing

On floors laid over joists or battens, board-to-fixing movement is another possibility. WoodSolutions also explains that shrinkage between joists and flooring can contribute to excessive squeaking. A site assessment should establish how the floor is fixed and what access exists beneath it before anyone specifies a refixing method. Guessing a screw location from the surface risks the wrong repair.

The sound is below the floor

ATFA points out that some noise comes from subfloor framing rather than the visible boards. A floor finisher may identify that the issue sits outside sanding and board repair; further carpentry or structural assessment may be needed. A newly coated floor over an unresolved moving base can still squeak.

The floor changes with humidity

Timber takes up and releases moisture as its environment changes. WoodSolutions says floors over joists can have more spring and may squeak more in drier weather. A noise that changes between seasons is useful evidence, but it is not a reason to ignore marked movement or a new, worsening sound. Note when it occurs so the repair assessment can consider the floor’s movement.

Should repairs happen before sanding?

Yes, if a repair is needed and can be scoped. Fixing a loose board after the floor has been finished can disturb the new coating or leave visible patching. The ATFA solid-timber flooring specification requires condition assessment and attention to areas of concern before sanding. The sensible sequence is diagnosis, agreed repair, then the sanding-and-coating decision—not an assurance that a full refinish will cure every sound.

That does not mean every occasional creak needs intervention. ATFA says some noise is common in timber floors. What matters is the extent, whether there is unusual movement and what you want the quote to achieve. Ask for the report to distinguish “appearance work” from “noise work.”

What an inspection can—and cannot—promise

A site visit can reproduce the sound, check whether a board edge or larger area moves, identify visible fixings, and assess available access below. It may narrow the repair to a specific board or reveal that the framing needs a different specialist. But a noise that appears only in certain humidity or temperature conditions may not occur during a single visit. Concealed framing cannot always be verified without access. The honest quote should name these limits, describe any further investigation needed and avoid promising total silence after a surface refinish.

Questions to put in the quote

1. Where do you think the noise originates, and what observations support that view?
2. Is the proposed repair to a board, its fixing, the subfloor, or another element?
3. Can that area be accessed without damaging finished surfaces?
4. What might remain audible even after the proposed work?
5. Is sanding needed for appearance, or only because the repair will disturb the finish?

If you are planning timber floor repairs alongside floor sanding, include photos of the exact spot and a note about when the noise occurs with your enquiry. That will help locate the problem for inspection; it cannot replace one.