Wood and laminate floors are quietly alive to the air around them. They take on moisture when the air is humid and release it when the air is dry, and as they do, they expand and contract. That movement is normal in small amounts, but when indoor humidity swings too far in either direction, the result shows up as buckling, cupping, gaps between boards, or a floating floor that lifts at the seams.
For Metro East homeowners, this is not a theoretical concern. Our summers are genuinely humid and our winters, once the furnace runs, can drop indoor air to desert-dry levels. Keeping your home in the 30 to 60 percent relative humidity range is the single most effective thing you can do to protect your flooring investment.
What Happens Outside the Safe Range
When humidity climbs above 60 percent, wood and laminate planks absorb moisture and swell. Because most floors are installed with a tight tongue-and-groove or click-lock system, that swelling has nowhere to go, so the planks push against each other and can buckle or peak at the seams.
When humidity falls below 30 percent, the opposite happens. Boards shrink, pull away from one another, and leave visible gaps that can become permanent if the dryness is severe or prolonged.
Practical Ways to Hold the Range
The good news is that staying in range rarely requires anything dramatic. A few consistent habits handle most homes:
Run a dehumidifier in summer, especially in basements and lower levels where moisture collects.
Use a humidifier in winter, either whole-home or room units, to offset the drying effect of forced-air heat.
Track levels with an inexpensive hygrometer so you are managing actual numbers rather than guessing.
Run your HVAC system on a steady schedule rather than letting the house swing between extremes when you are away, since stability matters as much as the target number itself.
A Note on New Installations
This is also why acclimation matters before installation. New flooring needs time in your home's actual conditions so it can adjust before it is locked into place. Skipping that step is one of the most common causes of movement problems down the road.
Maintaining steady humidity simply continues that protection for the life of the floor.
McCullough's Flooring has helped Metro East families choose and care for their floors since 1991. Visit us at Belleville, IL to talk through the best flooring for your home's conditions, or schedule a free in-home consultation. We proudly serve Belleville, IL, Edwardsville, IL, O'Fallon, IL, Collinsville, IL, and Swansea, IL .
Have questions about protecting your floors through Illinois seasons? Contact us today and let McCullough’s Flooring point you toward floors built to last in our climate.
