If your laminate floor develops a ridge, a soft spot, or a raised seam right around the peak of summer, you are not imagining a pattern. Laminate buckling is one of the most common flooring complaints in the Metro East, and it almost always traces back to the same root cause rather than a manufacturing flaw. Understanding why it happens makes it surprisingly preventable.
The core of a laminate plank is high-density fiberboard, a wood-based material that responds to moisture and temperature. Add an Illinois summer, with its sustained humidity, and you have the exact conditions that cause planks to expand and fight for space.
Humidity Is Usually the Culprit
When humid summer air pushes indoor moisture levels up, the fiberboard core absorbs it and the planks expand. Laminate is installed as a floating floor, meaning it is not glued or nailed down, so it relies on small expansion gaps around the room's perimeter to have somewhere to move.
When those gaps are too small, missing, or blocked by baseboards and trim, the expanding planks have nowhere to go. They press into each other and lift, producing the buckle or peak you see. The floor is not broken, it has simply run out of room.
The Other Common Triggers
Humidity sets the stage, but a few installation and maintenance issues turn a manageable expansion into visible damage:
No expansion gap left at walls, doorways, and fixed objects during installation.
Skipped acclimation, where planks were installed before adjusting to the home's conditions.
Excess water from wet mopping, which the fiberboard core absorbs at the seams.
An uneven or damp subfloor that introduces moisture from below.
How to Prevent It Going Forward
Prevention starts before the first plank goes down. Proper acclimation, a correctly prepared and dry subfloor, an adequate expansion gap, and a moisture barrier where needed address nearly every cause of buckling at the source.
After installation, the job is simply keeping conditions stable. Holding indoor humidity in the 30 to 60 percent range, cleaning with a damp rather than wet mop, and wiping spills promptly will keep a properly installed laminate floor flat for years. And in spaces that see real moisture, such as basements and bathrooms, waterproof luxury vinyl is often the smarter long-term choice than laminate.
McCullough's Flooring has installed and serviced laminate, vinyl, and hardwood across the Metro East since 1991, and we know how our climate treats every product on the floor. Visit us at Belleville, IL to find a floor suited to your space, or schedule a free in-home estimate. We proudly serve Belleville, IL, Edwardsville, IL, O'Fallon, IL, Collinsville, IL, and Swansea, IL .
Dealing with buckling laminate, or planning an install you want done right the first time? Contact us today and let McCullough’s Flooring help you get it solved.
