Acclimating laminate flooring is the process of allowing laminate planks to adjust to the temperature and relative humidity of the room where they will be installed. The acclimation period stabilises the dimensions of the high-density fiberboard (HDF) core before the locking mechanism is engaged, so the floor neither swells, shrinks, nor warps after installation. Skipping this step is the single most common reason laminate floors gap, peak, buckle, or refuse to click together — and it is also the most common cause of warranty claims being denied.
This article explains why acclimation is necessary, what happens at the material level, how long it should last, what conditions the room must meet, and what goes wrong when the step is rushed. The guidance below applies to floating laminate, click-lock laminate, and tongue-and-groove laminate alike.
What Does It Mean to Acclimate Laminate Flooring?
Acclimation is the conditioning of laminate planks to the indoor climate of their final installation site. The planks are stored, in their sealed packaging, inside the room where they will be laid. During this period, the moisture content of the HDF core equalises with the relative humidity of the surrounding air. Once equalisation is reached, the planks have stopped expanding and contracting, and they can be installed at their natural dimension.
Acclimation is not a curing process, not a drying process, and not a settling process. It is a moisture-equalisation process. The planks do not become stronger; they become dimensionally stable for the room they are about to live in.
Why Laminate Flooring Needs to Acclimate
Laminate flooring is built around an HDF core. HDF is engineered from compressed wood fibers, and like every wood-based material it is hygroscopic — it absorbs moisture from humid air and releases moisture into dry air. Laminate planks expand when humidity rises and contract when humidity falls, even after the wear layer and decor layer have been bonded to the core.
The plank that arrives at your home was manufactured in one climate, shipped through several others, and stored in a warehouse with its own temperature and humidity profile. The planks inside that sealed pack are not yet at the moisture content of your living room. If they are clicked together while still adjusting, the locking system will be loaded against itself the moment the room reaches its normal humidity. The result is one of three failures: peaking, gapping, or buckling.
Acclimation removes that risk. The planks reach the same moisture content as the room before they are locked, so the expansion gap around the perimeter is sized for the floor that actually exists, not the floor that arrived in the box.
How Long Should Laminate Flooring Acclimate?
The acclimation period for most laminate flooring is 48 hours minimum, with 72 hours preferred. In rooms with extreme conditions — basements, conservatories, recently plastered rooms, or homes where the indoor climate fluctuates — 96 hours is safer. The manufacturer’s instructions on the box take priority over any general rule. Some products are engineered to acclimate in 24 hours; others require a full 72.
There is no maximum. A pack of laminate can sit in a stable, climate-controlled room for weeks without harm. What damages it is the opposite: installing it before the moisture content has equalised.
The Correct Conditions for Acclimating Laminate
Acclimation only works when the room itself is at its normal living conditions. Acclimating in an empty, unheated, or freshly plastered room produces planks that are conditioned for a climate the room will never have again. The required conditions are listed below.
- Air temperature: 18–25 °C (64–77 °F), held steady during the entire acclimation window.
- Relative humidity: 35–65 %, measured with a hygrometer placed in the centre of the room.
- Subfloor moisture: below 12 % MC for timber subfloors and below 3 % MC for concrete subfloors, measured before the boxes are brought in.
- Wet trades complete: at least 7 days have passed since any plastering, screeding, or painting, with the room fully ventilated and dried.
- HVAC running: the heating, cooling, or underfloor heating system is operating at the same setting it will hold once the family is living in the room.
If any of these conditions is missing, the acclimation period restarts the moment the room reaches them. Boxes left in a cold, damp shell of a room are not acclimating — they are absorbing moisture they will later have to release.
How to Acclimate Laminate Flooring Step by Step
The process is mechanical, not technical. Five rules govern it.
- Bring the boxes into the installation room. Not the garage, not the hallway, not the next room over. Climate varies between rooms, and the planks must condition to the exact space they will live in.
- Lay the boxes flat and side by side. Stacking the boxes more than two or three high traps the planks in the middle of the stack and slows equalisation. Standing the boxes on edge causes the planks inside to bow under their own weight.
- Keep the boxes sealed. The shrink wrap and cardboard slow the rate of moisture exchange, which is intentional. A slow, even equalisation is what protects the locking edges.
- Keep the boxes away from exterior walls. Exterior walls are colder and damper than the centre of the room. Planks stored against them condition to the wall climate, not the room climate.
- Hold the room at normal living conditions. Windows closed, HVAC on, no fresh painting or plastering. The room must look like it will look once the floor is finished.
What Happens If You Skip Acclimation
The failures of unacclimated laminate are predictable. They occur in this order.
Peaking
Peaking is the raised ridge where two planks meet. It occurs when the planks were drier at installation than the room’s normal humidity. The HDF core absorbs moisture, the planks expand, the expansion gap is consumed, and the boards are forced upward at the seams. Peaking is permanent unless the floor is lifted and a wider expansion gap is cut.
Gapping
Gapping is the opposite failure. The planks were wetter at installation than the room’s normal humidity. As the core dries, the boards shrink and pull apart at the joints. Fixing gaps in laminate flooring usually requires lifting rows back to the affected board, which is rarely a one-hour job.
Buckling and Bubbling
Buckling is severe peaking, where the floor lifts off the subfloor entirely. It happens when expansion exceeds what the perimeter gap can absorb, and the only direction left for the planks to move is upward. Bubbling along the edges is an early warning that the core is taking on more moisture than the wear layer can contain.
Locking System Failure
If planks are installed while still moving dimensionally, the click profile is forced together at one width and tries to hold itself together at another. The result is a row that won’t sit flat, a joint that won’t close, or a tongue that breaks during installation. This is one of the most common reasons laminate flooring won’t click together on the day of fitting.
Voided Warranty
Almost every laminate manufacturer requires acclimation as a condition of the warranty. If a claim is filed for buckling, gapping, or peaking, the first question the manufacturer asks is whether the product was acclimated according to the printed instructions. A “no” or an “I’m not sure” closes the claim.
Acclimation and the Subfloor
Acclimation conditions the planks. It does not condition the subfloor. A correctly acclimated plank installed over a wet concrete slab will still fail, because the moisture is rising from below the underlay and into the core. The subfloor must be tested separately, before acclimation begins, and corrected if it is out of range. The requirements for a sound laminate subfloor are flatness within 3 mm over 2 m, full structural soundness, and a moisture content within the manufacturer’s tolerance.
On concrete, acclimation cannot compensate for an absent vapor barrier. Concrete continues to release water vapor for years after it is poured, and the laminate core will absorb that vapor as readily as it absorbs room humidity. A moisture barrier between the concrete and the underlay is the only way to keep that vapor out of the planks.
When Acclimation Cannot Save the Floor
Acclimation has limits. It cannot make a plank survive a room whose humidity swings outside the manufacturer’s range during normal use. Conservatories, unheated outbuildings, and bathrooms with no ventilation will continue to push the floor through expansion and contraction cycles regardless of how well the planks were conditioned at the start. Some rooms are simply unsuitable for laminate flooring, and acclimation does not change that.
It also cannot substitute for an expansion gap. Even a perfectly acclimated floor moves with the seasons, and an 8–12 mm perimeter gap is required so that movement has somewhere to go. Acclimation reduces the size of the movement; it does not eliminate it.
Acclimation Is the Cheapest Step in the Whole Job
The cost of acclimation is two to three days of patience. The cost of skipping it is a floor that fails within months, a manufacturer’s warranty that does not respond, and a second installation paid for out of pocket. The decision is almost always the same in hindsight, and almost always made differently before the boxes arrive.
Buy the floor. Bring it home. Put the boxes flat in the centre of the room. Close the door. Come back in 72 hours. Then begin the laminate flooring installation. The floor will reward the wait for the next fifteen years.
Frequently Asked Questions
Do I need to open the boxes during acclimation?
No. The shrink wrap and cardboard are designed to allow gradual moisture exchange while protecting the locking edges. Open boxes acclimate too quickly and leave the planks exposed to dust, knocks, and direct contact with cold floors.
Can I acclimate laminate in the garage and then move it inside?
No. Acclimation has to happen in the room of installation. A garage has its own temperature and humidity, and moving the planks indoors restarts the equalisation from scratch.
Does waterproof laminate need to acclimate?
Yes. The waterproof wear layer protects the surface; it does not stop the HDF core from responding to ambient humidity through the unsealed click edges. Every laminate, including waterproof grades, expands and contracts with the room.
Can I install laminate the same day it is delivered if the warehouse climate matched my home?
In theory yes, in practice almost never. The warehouse climate is rarely identical to your home, and the planks have spent hours in a delivery vehicle on the way over. The 48-hour minimum exists because the cost of being wrong is far higher than the cost of waiting.
What is the ideal humidity for laminate after installation?
The same range as during acclimation: 35–65 % relative humidity, year-round. A hygrometer in the room and a humidifier or dehumidifier as needed will keep the floor inside its comfort range and prevent the seasonal gapping and peaking that follow uncontrolled climates.
