Seasonal Expansion and Shrinkage in Hardwood Floors


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Seasonal Expansion and Shrinkage in Hardwood Floors


December 30, 2025


Wood is a natural, living material that reacts to its environment long after it has been harvested and installed. One of the most common concerns homeowners face is noticing gaps in the winter or cupping in the summer. At New England Custom Floor Supply, we know that understanding the science behind your floors is the first step to maintaining their beauty for a lifetime.

Why Does Wood Move?

The primary driver of seasonal wood movement is humidity. Hardwood is hygroscopic, meaning it absorbs and releases moisture depending on the surrounding air. In the humid summer months, wood absorbs moisture and expands. Conversely, during the dry winter months—especially when heating systems are running—the wood loses moisture and shrinks. This cycle is completely normal, but knowing how to manage it is a crucial part of proper hardwood floor care.

Summer Expansion vs. Winter Shrinkage

During periods of high humidity, you might notice the boards pressing tighter together. In extreme cases where there isn’t enough room for expansion, this can lead to “cupping,” where the edges of the board are higher than the center.

In the winter, as the air dries out, the wood contracts. This often results in small gaps appearing between the boards. While these seasonal gaps usually close up on their own once humidity levels rise again, consistent flooring maintenance tips can help minimize the movement.

Managing Your Indoor Environment

To keep your floors stable, the goal is to maintain a consistent indoor environment. Keeping your home’s relative humidity levels between 35% and 55% is ideal for minimizing significant changes.

  • Use a Dehumidifier: In the summer, running a dehumidifier or air conditioner helps pull excess moisture from the air.
  • Use a Humidifier: In the winter, adding moisture back into the air with a humidifier can prevent excessive shrinkage and gaps.

Hardwood Floor Supply in Stamford, CT

When it comes to selecting the perfect hardwood flooring for your space, look no further than New England Custom Floor Supply. Trust in our knowledge and craftsmanship to guide you in choosing the ideal hardwood floor that complements your home’s aesthetic. Elevate your space with the timeless beauty of hardwood flooring!

Get in touch with our team today.