Squeaky timber floors are a common frustration in New Zealand homes, particularly in older villas and bungalows where nail-fixed floorboards have worked loose over decades. The good news is that screwing down the offending boards is one of the most reliable and lasting fixes you can do yourself — no special skills required, just a bit of patience and the right technique.
Why Timber Floors Squeak
Before you reach for the drill, it helps to understand what's causing the noise. Squeaks happen when timber moves and rubs against something — usually:
- Loose floorboards rubbing against neighbouring boards or the subfloor
- Nails that have worked loose, allowing boards to lift slightly and squeak as they flex
- Boards rubbing on joists where the fixing has failed or the timber has shrunk
- Subfloor movement in homes with a suspended timber floor system (very common in NZ)
Identifying the exact squeak location is the first step. Walk slowly across the floor and mark squeaky spots with a piece of chalk or masking tape.
Tools and Materials You'll Need
- Power drill or driver
- Countersink drill bit
- Appropriate screws (see below)
- Stud finder or joist detector
- Hammer and nail punch (optional)
- Wood filler or timber plugs to hide screw heads
- Safety glasses
Choosing the Right Screws
Screw selection matters. For fixing floorboards down through the top face:
- Use coarse-thread timber screws — they grip better in timber than fine-thread screws
- For 19 mm tongue-and-groove pine boards going into a joist, a 50–65 mm screw is typically appropriate
- For thicker hardwood boards (25 mm+), go up to 75 mm
- Stainless steel or galvanised screws are worth considering in damp subfloor environments, which are common in NZ homes without adequate underfloor ventilation
Check the screw packaging for recommended timber applications. Your local Bunnings or Mitre 10 trade desk can help you select the right product if you're unsure.
Step-by-Step: Screwing Down a Squeaky Floor
1. Locate the Joists
Use a stud finder or tap the floor to find the solid sound that indicates a joist beneath. Screws must go into joists to be effective — driving into the subfloor alone won't hold. Mark joist lines with masking tape.
2. Pre-drill and Countersink
Always pre-drill a pilot hole slightly narrower than your screw shank. This prevents the timber from splitting — especially important with older, drier floorboards. Use a countersink bit so the screw head sits just below the surface.
3. Drive the Screw
Drive the screw firmly until the head is just below the surface. Don't overtighten — you can crack older boards. The goal is to pull the board tight against the joist without distorting it.
4. Repeat Along the Board
If a whole board is loose, place screws every 400–600 mm along the joist line, not just at the squeak point.
5. Fill the Holes
Use a timber filler matched to your floor colour, or cut small timber plugs from a matching species. Sand flush once dry. For polished or oiled floors, test the filler colour in an inconspicuous spot first.
Fixing Squeaks from Below (Subfloor Access)
If you have access to the underfloor space — common in older NZ homes on piles — you can fix squeaks from below without touching the finished floor surface:
- Have a helper walk the floor above while you identify movement from underneath
- Drive a screw up through the subfloor into the floorboard — be very careful to measure the combined thickness so the screw does NOT penetrate through the top of the finished floor
- Alternatively, apply a construction adhesive (such as a product from Sika) between the joist and subfloor where there is a gap causing movement
Tongue-and-Groove Boards: Secret Fixing Option
For tongue-and-groove boards where you want to avoid visible holes, you can secret-fix through the tongue at a 45-degree angle. This is fiddly but leaves no visible screw holes. It works best when you have some board lift and can access the tongue edge.
What About Engineered or Floating Floors?
This guide covers solid timber and nail-fixed subfloor systems. If your floor is a floating engineered timber or laminate floor, screwing is generally not appropriate — squeaks in floating floors are usually caused by an uneven subfloor or lack of expansion gap, and need a different approach.
A Note on Older NZ Homes
Many pre-1970s New Zealand homes have native timber floors — rimu, matai, kauri, or heart pine. These are often irreplaceable and can be brittle. Take extra care pre-drilling, use appropriately sized screws, and consider consulting a flooring specialist before working on heritage timbers. BRANZ has useful guidance on maintaining older NZ building materials.
When to Call a Professional
Consider calling a qualified flooring installer (you can find one on tradedirectory.co.nz) if:
- Widespread squeaking suggests significant structural movement or joist failure — this could indicate a building issue requiring assessment under the NZ Building Code
- The floor has extensive rot or damage to joists or subfloor
- You have underfloor moisture problems — poor ventilation is a major issue in NZ homes and can cause ongoing movement; check Energywise for underfloor insulation and ventilation guidance
- You're dealing with a heritage or high-value timber floor where mistakes could be costly
- The squeaking returns quickly after fixing, suggesting a deeper structural cause
If you're a landlord, note that Tenancy Services Healthy Homes standards require adequate underfloor insulation and ground moisture barriers, which can affect floor movement and squeaking.
