We have a few dozen boxes of laminate flooring purchased a few weeks ago (Harmonics with Uniclic, if anyone's interested). These have been stored in an unfinished basement in central Minnesota, and are destined to be installed on the first floor. We generally don't use the air-conditioner in summer, unless humidity levels are uncomfortable. Effectively, first floor and basement are mostly similar in local comfort conditions.

In this scenario, how long should we let the laminate planks acclimatize to the first-floor weather conditions, considering that the basement isn't severely different in temperament?

Would just a few hours do, or should we really let the planks sit idle for a couple of days to make sure there won't be any future usage problems?

My intent in asking this question is to roughly figure out what sorts of temperature + RH tolerances are built in to laminate flooring, and how critical differences of a few degrees in temperature or a few percentage points in relative humidity are.

Edit: (hopefully) related questions: Will installing laminate floors in winter show any different results from a summer installation? Will I see any shrinkage around the baseboards, for example? Or will heavy furniture cause gaps between installed planks in winter?

2 Answers 2


Their install guide says

"Under normal conditions, Harmonics® flooring requires no acclimation period. Normal conditions are defined as a difference of no more than 25°F and 20% relative humidity between the stocking/transportation environment of the flooring and the final installation environment of the flooring. Outside of normal conditions, let the planks acclimate for 48 hours in the unopened packaging at the normal room temperature in the middle of the room where the floor is to be installed.Allow air space between packages"

So looks like you can get installing right away.


As long as they are within 10 °F of each other and r.h. is 10% within each other, I think you are good to go.

Unless you are Superman, it will take you a day or two to install it anyway, and in that time it should complete acclimatization.

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