What is Wood Floor Cupping?

Wood floor cupping is unfortunately one of the most common issues that can plague hardwood floors. Wood floor cupping is when the sides of hardwood floors are higher up than the center of the boards. This produces a concave-like look on the floor. The issue comes from moisture content changes.

The Reality

If you’re fortunate to have engineered floors, the cupping is reduced due to its structure, or the way it’s manufactured. Engineered floors have a backer, which provides stability in changing moisture conditions. That’s why engineered hardwood floors are ideal in a kitchen.

If you don’t have engineered hardwood floors, no worries! In most cases people have their hardwood floors installed by a professional who takes moisture levels, and the type of subfloor into account. Taking in all these components, the chances of experiencing cupping is greatly reduced. Although it may occur, it may not be enough for anyone to notice.

How Can You Prevent Wood Floor Cupping?

There are a few things you can do to protect your wood floors from cupping. First, take a look at the relative humidity in your home, especially during the summer months. Keeping this number below 50% is ideal as it will mean less moisture in the air – which means less moisture that can seep into your wood floors. Using your air conditioner and turning off your home’s HRV, if applicable, will lower this number if it’s too high.

Another way to prevent wood floor cupping is by taking care of any spills and leaks promptly. Spills are easy to take care of – simply wipe your floors clean as soon as the spill occurs. Leaks can be problematic, though, as they can go on for a long time undetected. Try to monitor your sink, bath, and other water fixtures regularly. Ensure that you repair, or call in a professional, as soon as you notice a potential leak in your plumbing system. This will help in keeping your wood floors safe from potential cupping.

Finally, take special care whenever you clean your wood floors. Using proper cleaning techniques is essential when trying to prevent wood floor cupping from occurring. Don’t use a wet mop, or an excessive amount of water, when cleaning your floor. Dust your floor regularly with a dry dust mop – and when you need a deeper clean, opt for a hardwood flooring cleaner specially formulated for your particular type of wood flooring.

What if I Notice?

If you see cupping on your wood floors, then it is important to hire a professional to analyze and work towards fixing it. Wood floor cupping can happen from everyday items in your home, such as refrigerators, ice makers or toilets leaking. Also, if the humidity in the house is higher or lower than when the wood floors were acclimated at the time of installation, then cupping can occur. Cupping happens most during the winter. This is due to the rapid moisture level changes.

Wood Floor Cupping and the Mid-Atlantic Climate

In Baltimore and the surrounding Mid-Atlantic region, humidity shifts are often the hidden cause of wood floor cupping. The area’s seasonal pattern (damp springs, humid summers, and dry winters) creates constant movement within hardwood planks.

When moisture from the air or ground seeps into the underside of the wood, the boards absorb more water than the surface and begin to lift along the edges. Months later, when indoor heat dries the air, those same boards contract and may even flatten unevenly.

Homes in Baltimore City, Towson, Annapolis, and along the Chesapeake Bay are especially affected because of older foundations, basements, and crawl spaces that tend to hold moisture. These spaces can trap damp air, allowing humidity to rise into the subfloor. Without proper ventilation or vapor barriers, that trapped moisture slowly works its way into the flooring above.

Maintaining balance is the key. Keeping indoor humidity between 35 and 50 percent throughout the year helps prevent the boards from expanding or shrinking excessively. Dehumidifiers, air conditioners, and well-sealed crawl spaces can make a noticeable difference.

Floors that have been properly acclimated before installation and finished with quality sealants are also less likely to react strongly to moisture changes.

If you notice uneven boards or a wave-like texture developing across your hardwood, it is best to have a local flooring specialist like the ones at Signature Hardwood inspect the area. As a team of Baltimore-based professionals, we understand the region’s humidity cycles and construction methods common in local homes. We can pinpoint whether the issue stems from plumbing leaks, poor ventilation, or seasonal air changes.

By managing humidity and addressing leaks quickly, homeowners in the Mid-Atlantic can reduce the risk of cupping and keep their hardwood floors stable, attractive, and long-lasting.

 

If you notice that your wood floors may be cupping, we strongly recommend a professional to handle the task of fixing them. Contact the hardwood flooring experts at Signature Hardwood Floors for any questions, and a FREE ESTIMATE. You can call us at 410.415.0755 or click here today! You can also follow us on Facebook, Twitter, and LinkedIn!