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Answers · 14 questions

Moisture, climate and heating

Nearly everything that goes wrong with a wood floor is a moisture problem wearing a different costume. These are the numbers and mechanisms behind that.

What is cupping in hardwood floors?

Cupping is when the edges of a board rise higher than its center, typically caused by the underside of the wood absorbing more moisture than the top surface.

What is crowning in hardwood floors?

Crowning is the opposite of cupping, where the center of a board is higher than its edges, often seen after over-sanding a cupped floor before it has fully dried.

How does seasonal weather affect hardwood floors?

Hardwood naturally contracts in dry winter months, creating small gaps, and expands in humid summer months, tightening seams. This normal seasonal movement is expected and not a defect.

Can hardwood floors be installed in a humid climate?

Yes, with proper acclimation, a vapor barrier, and often engineered hardwood construction, hardwood floors can perform well even in humid climates.

Should I run a dehumidifier for my hardwood floors in summer?

In very humid climates or seasons, a dehumidifier helps keep indoor humidity in the recommended range, protecting hardwood from excess swelling and cupping.

What happens if hardwood floors get too dry in winter?

Overly dry air causes wood to shrink, which can create visible gaps between boards. A humidifier during heating season helps minimize this seasonal effect.

Is it safe to install hardwood over in-floor radiant heat?

Engineered hardwood rated for radiant heat is generally safe when installed correctly and the system is ramped up gradually rather than switched on at full temperature immediately.

Can direct heat vents damage nearby hardwood flooring?

Yes, floor vents blowing hot, dry air directly onto hardwood can cause localized drying and gapping right around the vent. Deflectors can help redirect airflow.

How does a basement's moisture affect hardwood installed there?

Basements tend to have higher ambient moisture from the ground, making solid hardwood risky. A proper vapor barrier and engineered hardwood are recommended for below-grade installations.

What is a moisture barrier and is it always necessary?

A moisture barrier is a plastic or foil sheet installed between the subfloor and hardwood to block ground moisture. It is essential over concrete and highly recommended in basements or humid climates.

How long should new hardwood acclimate in a humid vs dry climate?

Manufacturers often recommend 3 to 7 days minimum, but homes in extreme humidity or dryness may need longer acclimation periods to let the wood's moisture content stabilize before installation.

Can air conditioning help protect hardwood floors?

Yes, consistent air conditioning during hot, humid months helps regulate indoor humidity, reducing the risk of cupping and excess expansion in hardwood floors.

Does hardwood flooring perform differently near large windows or sunrooms?

Yes, these areas often see wider swings in temperature and humidity from direct sun and drafts, making engineered hardwood or added window treatments a smart choice there.

What is the ideal indoor temperature range for hardwood floor longevity?

Keeping indoor temperatures relatively stable, generally between 60 and 80 degrees Fahrenheit, alongside proper humidity control, helps hardwood floors maintain their dimensional stability year-round.

Have a floor that does not match any of the above? Call (848) 352-7337 and describe it. We would rather answer a question than sell the wrong floor.

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