How to Acclimate Flooring Before Installation: Step-by-Step
It's the least exciting step in a flooring project, and the one most likely to be skipped. But acclimation is exactly what separates a floor that stays flat and tight for decades from one that gaps, buckles, or develops mystery squeaks a few months after install.
The good news: it's simple, mostly hands-off, and mostly a matter of patience. Here's why it matters, how long it takes for each floor type, and the step-by-step process to get it right.
Quick Answer
Let your flooring sit in the room where it will be installed, under normal living conditions (60-80 degrees F, 30-50% humidity), until it reaches balance with the space. As a rule of thumb: engineered hardwood 3-7 days, laminate 48-72 hours, SPC vinyl 24-48 hours. Run the HVAC, keep boxes off exterior walls and out of garages, and confirm the subfloor is dry first. Always follow the manufacturer's specific instructions, since they can override these general ranges and skipping the step can void your warranty.
Why Acclimation Matters
Flooring materials expand and contract with the temperature and humidity around them. Wood is hygroscopic, meaning it absorbs and releases moisture from the air, swelling when it's humid and shrinking when it's dry. Laminate's fiberboard core reacts to humidity the same way. Even rigid vinyl responds to temperature. Shipping and warehouse storage expose your flooring to conditions nothing like your home.
Acclimation lets the material reach equilibrium moisture content, the point where it's in balance with the room, before it's locked into place. Install before that balance is reached and the floor keeps moving afterward. That's what causes gaps, cupping, peaking, buckling, tension on the locking joints, and squeaks. The failures often don't show up right away, which is what makes skipping acclimation so tempting and so costly. A floor that looks flawless in October can start separating by January.
How Long Each Floor Type Needs
|
Floor Type |
Typical Time |
Why |
|
Engineered hardwood |
3-7 days |
Real wood surface exchanges moisture with the air. More stable than solid wood, but still needs to reach balance. Dry climates need extra care. |
|
Laminate |
48-72 hours |
The fiberboard core is porous and reacts to humidity. Enough time for the planks to stabilize so locking joints seat cleanly. |
|
SPC vinyl |
24-48 hours |
The rigid stone core is highly stable, so it needs the least time, mostly to reach room temperature. Still recommended as best practice. |
These are guidelines, not guarantees. Acclimation is really about the environment, not the calendar: the floor is ready when its moisture content matches the room and subfloor, not simply when a set number of days has passed. In a home that's already at stable living conditions, the low end of each range is usually fine. In a newly built or freshly painted space where humidity is still settling, give it longer. Tropical wood species and unusually dry climates both call for extra time.
Twenty-four hours is not enough for wood. A single day only lets the flooring reach room temperature; it does not let the wood's moisture level stabilize. For engineered hardwood, resist the urge to install the day after delivery.
The Conditions That Actually Matter
Time means nothing if the environment is wrong. Before and during acclimation, the room needs to be at the conditions the finished home will actually live at:
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Temperature: A stable 60-80 degrees F, with the floor surface no colder than about 59 degrees F. Run the HVAC at normal living temperature for at least 48 hours before and after installation.
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Humidity: Keep relative humidity in the 30-50% range for wood (and roughly 30-65% for laminate and vinyl). Use a hygrometer to confirm it, rather than guessing.
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A closed, climate-controlled space: Acclimating with open windows, exposed exterior walls, or before the HVAC is running defeats the purpose. The environment has to be stable and constant.
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A dry subfloor: Acclimation only helps if the subfloor is in range. Wood subfloors should read at or below 12% moisture; concrete slabs should be tested and within the manufacturer's limit (commonly at or below 75% RH). Fix subfloor moisture before you begin.
Step by Step
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Prepare the room first. Get the space to normal living conditions and run the HVAC for at least 48 hours before the flooring arrives. Confirm temperature and humidity with a thermometer and hygrometer.
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Test the subfloor. Check moisture at several spots with a meter (wood) or the appropriate test (concrete). If it's out of range, remediate before going further, not after.
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Move the flooring into the actual install room. Not the garage, not the basement, not a hallway. The flooring has to acclimate to the specific room it will live in.
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Lay the boxes out flat and spread apart. Place cartons flat, side by side, in the center of the room, away from exterior walls and out of the direct path of HVAC vents. Don't stack them in a tall pile, which acclimates unevenly.
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Follow the manufacturer's rule on opening boxes. This one varies by product, so check the instructions (see the next section).
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Wait the full recommended time. Use the ranges above as a floor, not a ceiling. Extra time never hurts; rushing always can.
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Confirm balance, then install. For wood, the ideal check is a moisture meter reading on the planks within about 2% of the subfloor reading. When conditions are stable and matched, you're ready.
Should You Open the Boxes? It Depends on the Floor
This is where general advice goes wrong, because the answer is different for different materials:
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Engineered hardwood: Open the cartons and cross-stack the planks so air circulates on all sides. Sealed packaging traps moisture and slows the wood from reaching balance.
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Laminate: Many manufacturers specifically say to leave the boxes closed and the shrink wrap on during acclimation. Opening them can work against the intended process.
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SPC vinyl: Usually fine to leave boxed, or open the box ends for a little airflow. It's the most forgiving of the three.
The rule that always wins: follow the manufacturer's installation instructions for your exact product. Manufacturing methods differ, warranties depend on it, and their guidance overrides any general rule of thumb, including this one.
Common Mistakes to Avoid
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Scheduling the installer for the day after delivery. Buy your flooring with at least a week of lead time so it can acclimate properly before install day.
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Acclimating in the garage or basement. Those spaces have different temperature and humidity than the finished room, so the flooring balances to the wrong environment.
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Skipping the subfloor moisture test. A perfectly acclimated floor over a wet slab still fails.
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Installing in an unfinished space. Open windows, no HVAC, or wet paint and drywall mean the conditions aren't stable yet. Wait until the room is at true living conditions.
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Counting days instead of checking conditions. The calendar is a guideline; the moisture balance is the real finish line.
McMillan Flooring and Acclimation
McMillan floors ship from California and typically arrive within 3-7 days, so plan to receive your order with time to acclimate before install day. SupremeCORE SPC vinyl is highly dimensionally stable and needs the least time; EVOLVED laminate and European White Oak engineered hardwood need longer, as the ranges above describe. For the exact temperature, humidity, and timing for your specific product, follow the McMillan installation guides, which also cover subfloor prep, vapor barriers over concrete, and expansion gaps.
Plan the timeline: order early, get the room to living conditions and run the HVAC, move the boxes into the actual install room, test the subfloor, and wait the full window. A few days of patience protects a floor meant to last decades.
Frequently Asked Questions
How long should flooring acclimate before installation?
It depends on the material. Engineered hardwood typically needs 3-7 days, laminate 48-72 hours, and SPC vinyl 24-48 hours, all under normal living conditions. These are general guidelines: acclimation is complete when the flooring's moisture content matches the room and subfloor, not simply when a set number of days passes. Always follow your product's specific instructions.
Does vinyl and laminate flooring really need to acclimate?
Yes, though less than wood. Vinyl responds to temperature and laminate's fiberboard core responds to humidity, so both still expand and contract. Acclimating them reduces the risk of gapping, buckling, or joint failure after installation. SPC vinyl is the most stable and needs the least time, but it's still recommended as best practice, especially on jobsites where HVAC and humidity aren't yet settled.
Should I open the boxes while flooring acclimates?
It depends on the material. For engineered hardwood, open the cartons and cross-stack the planks so air circulates. For laminate, many manufacturers say to leave the boxes closed and shrink-wrapped. For SPC vinyl, either approach generally works. Because guidance varies by product, always follow the manufacturer's installation instructions for your exact floor.
What happens if I skip acclimation?
The floor may look fine at first, but problems often surface weeks or months later: gaps opening between planks, edges peaking or cupping, buckling, tension on the locking joints, and squeaks. Skipping acclimation can also void the manufacturer's warranty. It's the simplest, cheapest insurance against exactly these failures.
Can I acclimate flooring in the garage?
No. Flooring must acclimate in the specific room where it will be installed, because that's the environment it needs to balance with. Garages, basements, and hallways have different temperature and humidity, so acclimating there conditions the floor to the wrong environment and defeats the purpose.
The Bottom Line
Acclimation is patience, not skill. Get the room to living conditions, run the HVAC, test the subfloor, move the boxes into the actual install room, and wait the full window for your material. Follow the manufacturer's instructions on timing and whether to open the boxes. Do that, and you protect a floor built to last for decades against the one thing that quietly undermines it: moisture it never had the chance to balance with.
