Vinyl plank flooring (LVP) is popular in New Zealand homes for good reason — it's durable, waterproof, and easy to maintain. But when planks start moving, clicking underfoot, or shifting out of place, it's usually a sign that something went wrong during installation or subfloor preparation. The good news is that most causes are identifiable and fixable.
Why Vinyl Plank Flooring Moves
Before you can fix the problem, it helps to understand what's causing it. The most common culprits are:
- Insufficient expansion gaps — LVP expands and contracts with temperature and humidity changes. Without adequate gaps around the perimeter (typically 8–10 mm), the floor has nowhere to go and buckles or shifts.
- Uneven or poorly prepared subfloor — High spots, dips, or debris under the planks cause them to flex and work loose over time.
- Floating floor not weighted during installation — Floating LVP relies on its own weight and interlocking clicks to stay put. If it wasn't properly seated, joints can separate.
- Wrong product for the application — Some thinner or lower-quality LVP products aren't suitable for high-traffic areas or over underfloor heating.
- Missing or incorrect underlay — Using the wrong underlay (or doubling up when the product already has underlay attached) can make the floor feel spongy and cause movement.
- Temperature extremes — New Zealand homes, especially older ones without good insulation, can experience significant temperature swings that stress a floating floor.
Check Your Expansion Gaps First
This is the number-one cause of shifting and buckling in floating LVP floors. Walk the perimeter of the room and check that there's a consistent 8–10 mm gap between the planks and every fixed object — walls, cabinetry, door frames, and pipes.
If the floor is tight against the wall, the planks have nowhere to expand and will push against each other, causing lifting or lateral movement. The fix is to remove the skirting boards, trim back the planks to create the correct gap, and refit the skirtings to cover the gap. This is a manageable DIY job with a pull bar, tapping block, and a fine-tooth saw.
Tip: Never use skirting boards or scotia to force the floor down — they should only cover the gap, not pin the floor in place.
Assess and Fix Your Subfloor
A flat subfloor is critical. The general industry standard is no more than 3 mm variation over a 1.8 m straightedge. Use a long spirit level or straightedge to check for high and low spots.
- High spots on a concrete slab can be ground back with an angle grinder.
- Low spots on concrete can be filled with a self-levelling compound — products from Ardex or Mapei are widely used by NZ flooring professionals.
- Timber subfloors should be checked for squeaky or springy areas. Re-screw any loose sheets of particle board or plywood, and replace any damaged sections.
Also make sure the subfloor is clean and dry. Moisture is a major issue in NZ, particularly in older homes or on concrete slabs. If you suspect moisture, test with a moisture meter before laying any flooring. Persistent moisture may require a vapour barrier or professional remediation.
Re-engage or Re-lay Shifted Planks
If only a few planks have shifted or the click joints have separated, you may be able to fix them without pulling up the whole floor:
- Remove the skirting boards in the affected area.
- Carefully lift planks back from the nearest wall until you reach the loose section.
- Re-click the joints firmly using a tapping block and rubber mallet — never hit the planks directly.
- Work back toward the wall, maintaining your expansion gap.
- Refit skirtings.
If the joints are damaged or the locking tabs are broken, those planks will need to be replaced. Always keep a few spare planks from your original batch, as dye lots can vary.
Consider Glue-Down or Hybrid Options
If your floating floor keeps moving despite correct installation — for example, in a very high-traffic hallway or over underfloor heating — it may be worth switching to a glue-down LVP or a hybrid rigid-core product. Glue-down vinyl is adhered directly to the subfloor and won't shift, though it's harder to replace later. Hybrid flooring has a denser, more stable core that handles temperature fluctuations better than standard LVP.
Speak to a flooring specialist or check with suppliers at Bunnings or Mitre 10 about which product suits your specific situation.
Underfloor Heating Considerations
If you have underfloor heating, check that your LVP product is rated for use over it — not all are. The floor surface temperature should generally not exceed 27°C. Always follow the manufacturer's guidelines, and allow the floor to acclimatise to the room for at least 48 hours before installation. BRANZ has useful guidance on flooring performance in NZ conditions.
Acclimatisation Matters
LVP should be left in the room where it will be installed for at least 48 hours before laying, so it can adjust to the ambient temperature and humidity. Skipping this step — common when people are in a hurry — is a frequent cause of post-installation movement.
When to Call a Professional
If you've checked expansion gaps and subfloor flatness and the floor is still moving, or if you're dealing with significant moisture issues, it's time to bring in a qualified flooring installer. Persistent movement can damage the locking joints beyond DIY repair, and moisture problems left unaddressed can lead to mould — a serious concern under Healthy Homes Standards for rental properties.
A professional installer can also advise whether your current product is fit for purpose or whether a different system would serve you better. You can find experienced local flooring installers on tradedirectory.co.nz.
