Acclimation is giving flooring time to adjust to the conditions of the room where it will live before it's installed. It sounds simple, but it's often misunderstood. Some products need days; some manufacturers say their products don't need acclimation at all as long as the room is in the right range. What matters is following the specific instructions and getting the room right first.
Why floors move
Different flooring materials respond to different conditions:
- Wood and wood-based products (solid hardwood, engineered wood, laminate cores) take on and release moisture from the air. They swell in humid summers and shrink in dry winters.
- Vinyl (LVP and sheet vinyl) doesn't absorb much moisture, but it expands and contracts with temperature.
- Rigid core products (SPC and WPC) are more stable than flexible vinyl but still move with temperature.
Movement isn't a defect; it's physics. Problems happen when a floor is installed in one set of conditions and then lives in very different ones.
What acclimation really means
The goal isn't just "let the boxes sit for a while." It's to bring the flooring and the room to normal living conditions before installation. That means:
- The room is finished and enclosed: windows and doors installed, drywall and paint dry, wet trades done.
- The heating or air conditioning is running at the temperature the home will normally have.
- The flooring is stored in that room (not a cold garage or a hot truck) for the time the manufacturer specifies.
Many LVP makers ask for a set period, often 24 to 48 hours, with the room in a set temperature range. Some rigid core products say acclimation isn't required if the product and room are within the installation temperature range. Hardwood typically needs its moisture content checked against the subfloor and the expected conditions, not just a set number of days.
How to acclimate correctly
- Finish wet work like drywall mud, paint and tile, and let the home dry out.
- Run the heating or cooling at normal settings for several days before the flooring arrives.
- Store the boxes flat in the room where they'll be installed, away from exterior walls and heat vents.
- Leave space around stacks if the instructions say so; some say to open boxes, others say to keep them closed.
- Keep the room in the specified temperature range for the required time before, during and after installation.
- For wood products, measure moisture content of the flooring and subfloor and compare them.
Common acclimation mistakes
- Storing flooring in the garage or a cold porch in winter, then installing it right away in a warm house.
- Installing in an unheated home, like a renovation in January with the heat off, then turning on the heat.
- Installing during construction with wet drywall mud and new paint drying.
- Stacking boxes against a heat register or in direct sun from a big window.
- Assuming "waterproof" means no acclimation needed.
Expansion gaps still matter
Even perfectly acclimated floating floors expand and contract through the seasons. That's why manufacturers require an expansion gap at walls and fixed objects, hidden by baseboard or quarter round, and sometimes transitions in doorways or over long runs. Pinning a floating floor with cabinets or tight trim causes buckling. See transitions and trim.
Wisconsin seasons and acclimation
Our indoor conditions swing a lot: dry heated air in winter, humid summers without air conditioning in some homes, and cold basements. Installing in the middle of these extremes and keeping indoor conditions steady through the year gives any floor the best chance. Read Wisconsin humidity, seasons and your floors for more.