ᐅ Experiences with damp surfaces inside KALLAX units and swelling wood?

Created on: 30 Sep 2020 21:37
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Wolfkar
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Wolfkar
30 Sep 2020 21:37
Hello everyone,

Over the past few weeks, I have noticed that some compartments of my KALLAX shelving unit have developed damp deposits. These not only look unattractive but also seem to cause the wood to swell at the contact points upon closer inspection. Since the furniture is kept in a relatively dry area and the indoor humidity is controlled, I am wondering how this could happen and if anyone else has had similar experiences or perhaps tips on how to prevent this from happening permanently.

I am particularly interested in whether the moisture comes from the surroundings, possibly due to condensation on the smooth surfaces of the KALLAX, or if the material itself (particleboard with veneer) might play a role in the swelling. For example, I can imagine that standing water in decorative bowls on the shelves could contribute to these deposits, but I find it strange even without such direct moisture sources.

I would appreciate it if you could share whether you have ever encountered damp deposits or swelling wood on this or similar furniture pieces and how you solved the issue. Are there any special protective coatings or maintenance tips I should consider? Or would it be better to replace the shelves, and if so, with what exactly?

Thanks in advance for your insights and experiences!
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nonere
1 Oct 2020 09:13
Hello Wolfkar,

regarding your issue with damp deposits and swelling wood on the KALLAX shelf, here are some factual notes:

The KALLAX furniture is usually made from particleboard with a melamine coating. This coating is water-resistant, but it reliably protects only against short-term exposure to moisture. If moisture remains for a longer time or water stands on the surface, the protective layer can be damaged over time. This allows moisture to penetrate the engineered wood, which then swells.

Damp deposits often occur due to condensation when warm indoor air settles on cooler furniture surfaces, especially with limited air circulation. This can happen in closed compartments or corners. Also, placing flower pots or other water containers directly on the shelves can be very problematic. Often, the cause is less related to the overall humidity in the room and more due to locally excessive moisture.

To prevent this, I recommend:

- Using coasters and water protection under containers or plant trays
- Regularly ventilating rooms with moisture spore issues to reduce condensation
- For shelves, special coatings or water-resistant alternatives are available, such as PVC or acrylic sheets as an underlay
- Possibly replacing the damaged parts, ideally with moisture-resistant engineered wood or painted surfaces

A permanent solution is only possible if the source of the moisture is eliminated. If you cannot significantly reduce the problem in your apartment, using a different furniture material (for example, solid wood with a protective lacquer finish) is advisable.

I hope this helps you further.
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Scarlett
1 Oct 2020 18:52
I can fully understand how frustrating it can be when something unexpected suddenly causes problems.
nonere schrieb:
If moisture soaks in or water stands on the surface, the protective layer can be damaged over time. This allows moisture to penetrate the wood-based material, which then swells.

That’s exactly what I saw with my KALLAX shelf—I didn’t worry much for a long time about a few plant pots standing there without coasters. The effects come slowly, and often you only notice later how the moisture creeps in.

What helped me was sealing the affected shelves with clear varnish to create an additional barrier. It’s important to apply several thin coats and let each dry properly. I also tried to stabilize the humidity levels in the room.

I’m curious: How is it for you? Do you sometimes worry that the damage might spread? And how do you deal with concerns about the sustainability of the furniture when you constantly have to repair damage? I sometimes feel a bit helpless but don’t want to replace the shelving system entirely.

I look forward to your experiences and maybe some tips on how to balance practical use and preservation.
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GIPAPO
2 Oct 2020 07:44
Hello,

here is my quick assessment:

Moisture stains on the KALLAX usually come from standing water.

Tip: Do not place water containers without coasters underneath, and ventilate regularly.

Swelling can only be reversed if you can dry out the wood fibers; for more extensive damage, you will need to replace the parts.

If you want to replace individual shelves, matching replacement shelves are available at Ikea or at hardware stores, also made from MDF or more water-resistant materials.

Regards