Why flooring needs time to acclimatise before fitting

Acclimatisation is one of those steps in a flooring job that's easy to skip under time pressure, since it produces no visible progress on the day — the flooring just sits in the room, unopened or stacked flat, doing apparently nothing. But it's a genuinely important part of the process for laminate and engineered wood specifically, and skipping it is one of the more common causes of problems appearing weeks or months after a floor is fitted.

The reason acclimatisation matters comes down to how wood-based materials respond to temperature and humidity. Both laminate (built around a wood-fibre core) and engineered wood (with a real timber veneer) will naturally expand or contract slightly as they adjust to the temperature and moisture level of the room they're fitted in. If the flooring is fitted straight from a cold van or a different environment without being given time to settle into the room's actual conditions first, that expansion or contraction happens after installation rather than before it — which can show up later as gaps opening between boards, boards peaking or lifting at the joints, or in more serious cases, visible buckling across an area of the floor.

For laminate flooring, most manufacturers recommend leaving the packs to acclimatise in the room they'll be fitted in for around 24-72 hours before installation, with some manufacturers specifying more precisely around 48-72 hours because of laminate's layered, protective construction, which can slow how quickly it exchanges moisture with the surrounding air. A minimum of around 24 hours is commonly cited as a baseline across most guidance, but this should be treated as a floor, not a target — checking the specific manufacturer's instructions for the exact product being fitted is the most reliable approach, since requirements do vary between brands and ranges.

Engineered wood flooring generally follows a broadly similar window, commonly cited around 24-72 hours, though its more dimensionally stable layered construction — a thin real-wood veneer bonded onto an engineered board base — often means it needs a somewhat shorter acclimatisation period than solid wood flooring would. That said, some manufacturers still specify up to 72 hours for their engineered products, so again, the specific product's own instructions should take priority over any general rule of thumb.

During the acclimatisation period, the conditions in the room matter almost as much as the time itself. A relative humidity of around 45-65% and an ambient room temperature of around 18-24°C are commonly cited as the target range for effective acclimatisation — a room that's unusually cold, damp, or has just had wet plastering or decorating work done isn't a suitable environment for flooring to acclimatise in properly, and may need heating or ventilating first. How the packs are stored matters too: they're commonly recommended to be left flat on the floor with a small gap between each pack to allow air to circulate, rather than stood upright, since storing packs upright can cause the boards inside to bow before they're even fitted.

Skipping acclimatisation, or cutting the recommended period short to save time on a job, doesn't always cause a problem immediately, but it meaningfully increases the risk of gaps, peaking or buckling appearing once the floor has settled into the room's actual conditions over the following weeks. It's also worth knowing that most flooring manufacturers explicitly require acclimatisation as a condition of their product warranty, so a floor that fails because acclimatisation wasn't followed may not be covered even if the flooring product itself was never faulty. For anyone having flooring fitted, it's a reasonable and simple question to ask a fitter directly: has the flooring been left in the room long enough, and does that match what the specific manufacturer's instructions actually call for on this product.

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