What Happens If Cork Gets Wet?

Cork is popular for its softness, sustainability, and elegance - but what if it gets wet? Will it hold up?

Whether you’re thinking about installing cork flooring in your house, or simply planning to buy some cork boards for the office, this article will answer all your questions.

Can cork get wet?

Cork contains suberin, a waxy substance that gives it some natural resistance to water. It’s not waterproof, though, and untreated cork can absorb water, especially if it's exposed to it for prolonged periods. It can then become soft, warped, or even develop mould.

The way cork will handle water depends heavily on whether it’s been sealed, and this applies to all kinds of cork products, from coasters to floors.

What happens if cork gets wet?

If it stays too wet for too long, cork may start to absorb water - especially if it’s unsealed - which can lead to:

• Swelling or expansion
• Discolouration
• Warping or softening
• Mould or mildew

That’s why it’s important to avoid exposure to liquids and to clean up any spills as soon as you can. These precautions are useful in any case, though sealed cork will always handle moisture much better.

Can water damage my cork flooring?

If your cork flooring does get wet, that’s not necessarily a cause for concern, but there is a risk of damage, which depends on the type of flooring and whether it's properly sealed.

Modern cork flooring usually comes pre-finished with a water-resistant coating. This makes it perfectly suitable for spaces like kitchens, entryways, or dining rooms, where occasional spills are likely. So long as spills are cleaned promptly, the flooring will hold up well.

However, standing water or frequent exposure can cause problems, especially if the edges or seams are not sealed properly. Cork flooring isn’t recommended for very wet areas, like laundry rooms, unless it's specifically rated as water-resistant.

What are the consequences of cork swelling or expanding?

As mentioned above, cork expands when wet. Its honeycomb-like cell structure allows it to absorb water, which causes it to swell. This is why installers always leave gaps around the edges of cork flooring, to allow for some expansion.

The problem with swelling is that it can lead to:

• Buckling
• Uneven surfaces
• Damage to the adhesive bonds in glue-down tiles

Can cork boards get wet?

Cork boards - like pinboards and bulletin boards - are not designed for wet or humid environments. If exposed to water, they can:

• Soften or crumble
• Curl or warp
• Develop mould behind the board (especially if mounted on drywall)

While some mild degree of humidity might not cause immediate damage, cork boards should be kept dry and away from sources of moisture; don’t put them up in steamy bathrooms or on windows prone to condensation.

How to protect cork from water damage

Here is the good news: with a few precautions, cork can last for a long time - even in rooms where spills happen occasionally. Here’s how to keep it safe:

• Seal it: Use polyurethane or another water-resistant sealant, especially on floors.
• Clean spills as soon as you can: Don’t let water sit - wipe it up quickly.
• Use rugs or mats: In spaces with a lot of activity, like kitchens, place mats near sinks or dishwashers.
• Avoid wet mopping: Instead, use a damp (but not soaked) cloth.
• Check product labels: Choose cork labelled as “water-resistant” if you’re installing it in areas prone to moisture.

These steps help prevent water from seeping through the cork surface and causing swelling, warping, or damage.

Conclusion

Cork is a beautiful and sustainable material, but it’s not invulnerable. Cork can get wet, and can handle itself well when it does. However, especially if it’s untreated or exposed to standing water, excess moisture may cause problems.

That said, sealed cork flooring and accessories are perfectly safe for areas like kitchens and living rooms; just remember to clean up liquid spills promptly and maintain the finish.

*Images on this blog have been AI generated.