Every winter, our phone rings with the same concern: "There are gaps between my floorboards — did something go wrong?" Usually, the answer is no. Seasonal wood movement is one of the most misunderstood aspects of owning real hardwood floors — and one of the most important to understand.

Wood Is a Living Material

Even after it's been milled, dried, finished, and installed, wood continues to respond to the humidity of its environment. When indoor air dries out in winter (heating systems are notorious for this), wood loses moisture and shrinks across its width. That shrinkage creates gaps between boards. When spring arrives and humidity rises, those gaps close again. This is not a flaw — it's physics.

What's Normal vs. What's Not

Normal: Hairline gaps between boards that appear in winter and close in spring. Slight cupping or crowning that resolves seasonally. Minor squeaking in cold months.

Worth investigating: Gaps wider than a nickel that don't close in summer. Cupping that persists through multiple seasons. Buckling or lifting boards. These can signal a moisture problem — a plumbing leak, inadequate vapor barrier, or extreme humidity fluctuations — that warrants professional attention.

How to Minimize Seasonal Movement

  • Maintain consistent indoor humidity between 35–55% year-round. A whole-home humidifier is the most effective tool in Colorado's dry climate.
  • Avoid dramatic temperature swings. Keeping your thermostat within a consistent range reduces the stress on your floors.
  • Use area rugs in high-sunlight zones. Direct sun accelerates surface drying and can intensify seasonal gaps.

Don't Rush to Fill the Gaps

A common mistake: filling winter gaps with wood filler. In spring, when the boards expand back, that filler has nowhere to go — it buckles, chips, or forces boards apart. If you're concerned about persistent gaps, talk to us first. In some cases, we can do a targeted fill using a flexible, color-matched compound. But patience is often the right prescription.

Still concerned about gaps in your floor? Give us a call — we can assess whether it's normal seasonal movement or something that needs attention.