How long does laminate flooring need to acclimatise?

At least 48 hours, laid flat in the room it will be fitted in, at a normal living temperature of 18 to 25°C. Most manufacturers ask for the packs to stay closed. Give it 72 hours or more over a concrete or newly screeded subfloor, and always check the exact figure in your product's instructions, because it sets the warranty.

Do you have to let laminate acclimatise?

Yes. Laminate has a wood-based HDF core that expands and shrinks with temperature and humidity. Fitting it straight from a cold van locks in a size that changes once the room reaches it, which is what causes gaps in winter and peaking in summer. Skipping acclimatisation is one of the few things that voids most laminate warranties outright.

Should you open laminate boxes to acclimatise?

Follow the packet, because brands split on this. Most ask you to leave the packs sealed and simply stacked flat in the room, since the sealed board still reaches room temperature. A few want the ends opened so the boards breathe. When the instructions say nothing, leave them closed and give the stack the full 48 hours.

What temperature should the room be to acclimatise laminate?

Normal living temperature, roughly 18 to 25°C, and crucially the temperature the room will actually be lived in at. A garage at 8°C does not count as acclimatising for a room kept at 21°C. Turn the heating on, and if you have underfloor heating, run it through its commissioning cycle before the boards go down.

How long does laminate need to acclimatise? (48 hours, and when you need longer)

14 July 2026

Leave laminate to acclimatise for at least 48 hours, laid flat and usually still in its sealed packs, in the actual room it will be fitted in, held at a normal living temperature of 18 to 25°C. That is the figure most manufacturers print, and it is the one the warranty depends on. Give it longer, 72 hours or more, over a concrete or newly screeded subfloor, or when the boards have arrived cold, because the wood-based core needs time to settle to the room before it is locked into place. Always check your own product's instructions first: the number varies by brand, and fitting early is one of the few mistakes that voids a laminate guarantee outright.

How long does laminate need to acclimatise?

Forty-eight hours is the baseline, but the subfloor and the delivery decide whether you need more:

Situation	Time to allow	Why
Timber subfloor, boards delivered warm	48 hours	The standard minimum; the core reaches room equilibrium
Concrete or screed subfloor	72 hours or more	Concrete holds and releases moisture slowly, so the board needs longer to settle
Newly plastered or newly screeded room	72 hours plus, once the room itself is dry	Fresh plaster and screed release a lot of moisture; the room has to be dry before the clock starts
Boards delivered in winter or stored cold	72 hours	A cold pack has to reach living temperature all the way through before it has settled
Underfloor heating	48 hours, after the heating commissioning cycle	The board must acclimatise to the floor as it will actually run, not cold

The single figure to quote if someone asks is 48 hours at 18 to 25°C, but the honest answer carries the caveat: longer on concrete, longer after plastering, longer when it arrives cold.

Why does laminate need to acclimatise at all?

Because a laminate board is mostly wood. Under the decorative and wear layers sits a high-density fibreboard (HDF) core, and like all wood-based material it takes up and gives off moisture with the air around it, swelling slightly when the room is humid and shrinking when it is dry. It moves with temperature too.

Acclimatising simply lets the board reach the same temperature and humidity as the room before you click it together, so it does most of its moving while it is still loose in the pack. Fit it straight from a cold van and the boards expand as the room warms them, but now they are locked edge to edge with no slack. Something has to give, and it shows up as joints lifting or peaking in the first warm spell. This is also the reason a floating laminate floor always needs its 8 to 12 mm expansion gap at every wall: even a properly acclimatised floor keeps breathing with the seasons.

How do you acclimatise laminate correctly?

The mistakes are nearly always about where the packs sit, not how long:

Put the packs in the right room. They have to settle to the conditions of the room they will be laid in. A pile left in an unheated garage or a cooler hallway acclimatises to the wrong place.
Lay them flat and spread them out. Stack the packs flat on the floor, not on their edges and not leaning against a wall, or they can bow. Spread them around the room instead of in one tall tower so air reaches each pack.
Keep them off the extremes. Away from external walls, radiators, sunny windows and any damp corner, all of which sit at a different temperature or humidity from the middle of the room.
Leave the packs sealed unless told otherwise. Most brands want them closed; a few ask you to open the ends. When in doubt, closed, for the full 48 hours.

When does laminate need longer than 48 hours?

Two things stretch the time: a subfloor that is still giving off moisture, and boards that arrive cold.

Concrete and screed are the usual culprits. They hold moisture for weeks, and a freshly poured screed can take a month per 25 mm of thickness to dry before any floor should go near it. Acclimatising the boards for 72 hours does not fix a wet slab; it only settles the board once the slab itself is dry, so run a moisture test on concrete before you even start the clock. The same patience applies after fresh plastering: the room has to lose its building moisture first.

Cold is the other one. A pack that has spent a January day in a van or an unheated store is cold right through, and 48 hours is the minimum to bring it up to a warm room, so give a winter delivery 72 hours to be safe.

What happens if you skip acclimatisation?

The floor moves after it is down instead of before, and it moves as one locked sheet with nowhere to go:

Gaps open at the joints. Boards fitted while slightly swollen shrink back as the room dries, pulling the joints apart over the following weeks.
Boards peak and buckle. Boards fitted cold expand as they warm, and with no slack at the joints or the walls they lift at the seams or bow upward.
The warranty is gone. Manufacturers list acclimatisation as a condition of the guarantee, so a movement problem traced back to early fitting is not covered.

None of this changes how much flooring you buy, so you can still plan the job while the packs settle: work out the packs with a laminate calculator, and use the 48 hours to settle where to start and which way the boards run so the first row goes down the moment the wait is over.

Frequently asked questions

How long does laminate flooring need to acclimatise?: At least 48 hours, laid flat in the room it will be fitted in, at a normal living temperature of 18 to 25°C. Most manufacturers ask for the packs to stay closed. Give it 72 hours or more over a concrete or newly screeded subfloor, and always check the exact figure in your product's instructions, because it sets the warranty.
Do you have to let laminate acclimatise?: Yes. Laminate has a wood-based HDF core that expands and shrinks with temperature and humidity. Fitting it straight from a cold van locks in a size that changes once the room reaches it, which is what causes gaps in winter and peaking in summer. Skipping acclimatisation is one of the few things that voids most laminate warranties outright.
Should you open laminate boxes to acclimatise?: Follow the packet, because brands split on this. Most ask you to leave the packs sealed and simply stacked flat in the room, since the sealed board still reaches room temperature. A few want the ends opened so the boards breathe. When the instructions say nothing, leave them closed and give the stack the full 48 hours.
What temperature should the room be to acclimatise laminate?: Normal living temperature, roughly 18 to 25°C, and crucially the temperature the room will actually be lived in at. A garage at 8°C does not count as acclimatising for a room kept at 21°C. Turn the heating on, and if you have underfloor heating, run it through its commissioning cycle before the boards go down.