Your floor is expanding — and it has nowhere to go
Laminate flooring is what installers call a "floating floor." The planks aren't glued or nailed to the subfloor — they lock together and simply rest on top, free to move slightly as temperature and humidity change. That movement is by design. The problem is that when the floor expands and it can't move outward — because the expansion gap around the perimeter is too narrow, or something is pinning the planks — the pressure has to go somewhere. It goes up. That's the buckle you're seeing.
Moisture is the single most common trigger. Laminate's core layer, typically made of high-density fiberboard (HDF), is highly absorbent. It doesn't take a flood — a slow leak under a dishwasher, high indoor humidity, a pet's water bowl sitting directly on the floor, or even steam from cooking can introduce enough moisture to cause the core to swell. Once HDF swells significantly, it often can't return to its original dimensions, which is why catching this early matters.
Temperature swings are the other major driver. A floor installed near a south-facing sliding glass door or in a sunroom can expand dramatically on a warm afternoon, especially if the room wasn't at normal living temperature when the floor was laid. If the installer didn't account for that range, the floor is fighting a losing battle every time the sun comes through.
Buckling shows up in different ways — and each points to a different cause
Not all buckling looks the same. Identifying where and how your floor is lifting usually tells you a great deal about what triggered it.
Left alone, a buckling floor usually gets worse — not better
If the cause is purely thermal — say, the floor expanded on a hot day and the expansion gap was just slightly undersized — you may find it settles back down on its own when temperatures drop. That's the best-case scenario, and it does happen. But if moisture is involved, waiting is the wrong move. Wet HDF core doesn't dry out and return to its original shape the way hardwood can. It stays swollen, the interlocking joints stress and eventually crack, and you end up replacing planks rather than simply fixing a gap. Worse, moisture sitting beneath laminate creates ideal conditions for mold in the subfloor — a problem that's significantly more expensive to remediate than fixing a floor early.
According to the North American Laminate Flooring Association (NALFA), most laminate buckling failures are installation-related — specifically, inadequate expansion gaps or failure to acclimate the flooring before installation. Both issues are preventable, and many are correctable without full replacement if caught before the planks themselves warp permanently. Subfloor moisture remediation, when required, typically costs $500–$3,000 depending on scope — versus $1,500–$5,000+ for full floor replacement in an average room.
There is a trusted solution for this.
We've verified what works, what doesn't, and what the evidence actually says — so you don't have to sort through conflicting advice on your own.
See the Trusted Solution →Free to read · Independently verified · Updated March 2026
What others have experienced
47 community experiences-
DM
We had a big ridge appear in our living room after a really humid stretch in August. I was convinced the floor was ruined. Turned out the baseboard on one wall had been nailed straight through the laminate into the subfloor — the installer must have done it by accident. Once my husband pulled it up and re-nailed it into the wall stud only, the floor flattened out over about ten days. Still can't quite believe it worked.
31 found this helpful -
TR
Ours was a slow drip under the dishwasher we didn't notice for probably two months. By the time we found it, four planks near the kitchen doorway had swollen so badly the joints cracked. We had to replace those planks — luckily we had leftovers from the original install. The rest of the floor was fine once we got a dehumidifier running and dried everything out. Lesson learned: check under appliances regularly.
24 found this helpful -
SL
My floor buckled after we turned the heat on for winter — it had been sitting at a lower temperature all fall. Called the flooring company and they said the installer didn't leave enough expansion gap by the sliding door. They came back, cut a slightly wider gap behind the door threshold, and reinstalled the transition strip. That was it. The buckle was gone within a week. Frustrating that it happened, but at least it wasn't a major fix.
18 found this helpful
Have you dealt with this? Share what you tried — it helps others in the same situation.