Your parquet isn't just old — it's reacting to moisture, exactly the way wood is supposed to. Here's the building-science explanation, and what actually helps.
Gaps that open and close with the seasons, edges that curl slightly upward, boards that seem to have a gentle dome in the middle — these aren't signs of a badly made floor. They're wood behaving exactly as wood does: absorbing and releasing moisture from the air around it, and changing shape as it does.
Singapore's climate makes this more pronounced than almost anywhere else, because the swings between air-conditioned indoor air and outdoor tropical humidity happen constantly, every single day.
Timber is hygroscopic — it absorbs moisture from humid air and releases it in drier conditions, expanding and contracting as it does. In Singapore, outdoor relative humidity regularly sits above 70–80%, while air-conditioned indoor spaces can drop closer to 50–60%. Every time your aircon cycles on and off, or a window is opened, the parquet is absorbing or releasing moisture in response.
Over years of these cycles, boards develop tiny gaps as they shrink during dry spells, then swell back during humid periods — sometimes not perfectly returning to their original shape. That's how a floor slowly develops permanent gaps, even without any single dramatic event causing them.
| What You See | What's Happening | Typical Cause |
|---|---|---|
| Small gaps between boards | Wood shrinking in dry air | Normal seasonal movement |
| Cupping (edges higher than centre) | Board's underside more humid than top | Moisture from subfloor or spills |
| Crowning (centre higher than edges) | Board dried unevenly after cupping | Often follows sanding a still-damp floor |
| Buckling (lifting off subfloor) | Severe, sustained moisture exposure | Major leak or flooding – needs prompt attention |
The gap between outdoor humidity and air-conditioned indoor air is exactly what drives repeated expansion and contraction in parquet.
Small, seasonal gaps are normal and usually don't need repair. Persistent cupping, crowning, or buckling are signs to get the floor checked before the damage spreads to more boards.
Will gaps close up again on their own? Small seasonal gaps often do shrink back during humid months, but gaps that have widened permanently over years usually need gap-filling as part of a proper refinish.
Is engineered parquet completely immune to this? No — it's more resistant, not immune. Engineered parquet still moves with humidity, just less dramatically than solid timber, thanks to its cross-layered core.
Should I fill gaps myself with a DIY filler? DIY fillers can look mismatched and may not flex the same way the surrounding wood does, often cracking out again within a year or two — professional gap-filling uses a matched wood-and-resin mix applied during refinishing.
Why does gapping seem worse in some rooms than others? Rooms with less consistent aircon use, more direct sun, or proximity to a kitchen or bathroom typically see more humidity swings, and therefore more visible movement, than a steadily air-conditioned bedroom.
Is it worth measuring humidity before assuming it's the cause? Yes — a simple hygrometer over a week or two can confirm whether swings are unusually large, which helps rule in or out humidity as the primary driver versus a subfloor or installation issue.
Seeing gaps, cupping, or curling in your parquet? Send us a photo and we'll assess it.
WhatsApp a Photo NowWe assess whether gapping or cupping is normal seasonal movement or a sign of a deeper moisture issue before recommending any repair.
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