Acclimating engineered hardwood works less like a kitchen timer and more like a thermostat. The hours on the clock matter less than the room reaching normal living conditions and staying there.
Here is how to acclimate engineered hardwood the way the brands we carry describe it: run the heating and air conditioning until the room holds 60 to 80°F and about 35 to 55% relative humidity, starting 5 to 14 days ahead depending on the brand.
Then deliver the cartons into that room, keep them closed and off bare concrete, wait the time the manufacturer lists (72 hours for Chesapeake and Denali), and confirm with a moisture meter before the first board goes down.
What the three engineered brands we carry ask for
We compared the installation documents of three engineered hardwood brands in our engineered hardwood collections. They agree on more than most online advice does:
| Chesapeake (guidelines dated June 2025) | Denali (guidelines revised January 2026) | Hallmark (installation instructions) | |
|---|---|---|---|
| Climate running before | HVAC fully operating at least 14 days before installation | Normal living conditions at least 5 days before delivery | Year-round conditions at least one week before installation |
| Temperature | 60–80°F | 60–80°F | 60–80°F |
| Relative humidity | 35–55% | 35–55% | 30–55% (hickory 35–55%) |
| Acclimation time | At least 72 hours in the installation area | 72 hours | Until the boards reach equilibrium with the room |
| Cartons | Do not open until you are ready to install; raise 4 inches off on-grade concrete | Do not open the boxes or the shrink wrap during acclimation | Do not open boxes prior to installation; store with 4 inches of air space underneath |
| Moisture rule | Wood subfloor and flooring within 2% of each other | Flooring at 7–10%; plywood or OSB subfloor within 4% of the flooring | Boards dried to 8–10%, plus or minus 2% |
Sources: Chesapeake, Denali and Hallmark installation documents. If your product is from another brand, its own sheet wins.
Mistake 1: Opening the boxes to let the wood breathe
All three manuals say to keep the cartons closed. Chesapeake says not to open them until you are ready to begin installation, Denali says not to open the boxes or the shrink wrap during acclimation, and Hallmark says the boxes stay completely closed until installation.
Plenty of advice online says the opposite. With an engineered floor, the instructions printed for that product are the ones the warranty is judged against, so follow them.
Mistake 2: Bringing the flooring in before the house is closed and conditioned
Acclimation only means something if the room already behaves like a lived-in home. Chesapeake asks for all wet work to be finished and the building fully enclosed. Denali adds that doors and windows must be installed and weather-stripped before the flooring arrives.
Drywall mud, fresh paint and open windows all push humidity around. Wood that adjusts to those conditions is adjusting to the wrong room.
Mistake 3: Treating 72 hours as a timer
The 72 hours start once the conditions are right, not when the truck leaves. Denali requires normal living conditions for at least 5 days before delivery, and Chesapeake asks for the HVAC to run for at least 14 days before installation.
A trade magazine Q&A from Wood Floor Business makes the same point: weeks of waiting mean little if the job site swings hot and humid during installation. Measure the conditions; don’t just count the days.
Mistake 4: Stacking cartons on a bare slab or out in the garage
Acclimate the flooring in the room where it will be installed, as Chesapeake specifies, not in a garage, a porch or a storage unit with different air.
A slab on grade can hold moisture, so Chesapeake asks for cartons to be raised 4 inches off on-grade concrete, and Hallmark calls for dry stickers or a pallet that leaves 4 inches of air under the boxes.
Mistake 5: Skipping the meter readings
A moisture meter turns acclimation from a guess into a reading. Here is how the numbers work with two of the brands above.
Say your meter shows 8% on the flooring and 11% on the plywood subfloor, a 3-point difference.
For a Denali floor, the flooring sits inside the required 7 to 10%, and the 3-point gap is within Denali’s 4% limit for plywood or OSB. For a Chesapeake floor, the same 3-point gap is over the 2% limit, so the floor is not ready yet.
Same house, same readings, two different answers. That is why we always point people to the sheet for the exact product. Denali also asks for temperature and humidity to be measured and recorded every day during installation.
Mistake 6: Heating the job site with propane
On a cold-weather job, a propane heater looks like a quick fix. Denali’s guidelines say it does not recommend propane heaters to warm the interior, because that kind of heating raises the relative humidity inside the structure. Use the permanent HVAC system, or a temporary one that holds the specified temperature and humidity.
Mistake 7: Letting the conditions drift once the floor is down
Acclimation is not a one-time event; the same range applies for the life of the floor. Denali tells owners never to turn the HVAC off when they are away, for example on vacation, because the floor can shrink, gap or buckle.
Chesapeake recommends a humidifier in the dry heating season and an air conditioner or dehumidifier in the humid season. Plank width raises the stakes, since wider boards move more for the same change in moisture.
Planning an engineered floor? Compare the lines and their sheets in our engineered collections, or schedule a showroom visit and ask us for the installation document of the floor you like.
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