ᐅ KALLAX in High Humidity – Is It Durable Over Time?

Hello everyone,

I am currently considering whether the IKEA KALLAX shelf unit is suitable for my apartment, as I have relatively high humidity levels there—especially in winter due to frequent ventilation and mostly unheated rooms. My question is: how well does the KALLAX unit hold up against moisture over time?

I understand that the material is primarily coated particleboard, but how does it react to long-term exposure to moisture? Are there any experiences or recommendations on how to best protect the shelf to prevent it from swelling, warping, or even developing mold?

It would be great if someone in the forum could shed some light on this aspect, as I would like to avoid having problems with the furniture after a short period. Thanks in advance for your tips and advice!

Mandyti45 schrieb:
How well does the KALLAX shelf hold up to moisture over time?

The KALLAX is not designed for very humid environments. If the relative humidity regularly exceeds 60%, it will eventually swell. Protection through sealing or proper ventilation is important.

Mandyti45 schrieb:
How well does the KALLAX shelf hold up to moisture over time?

Hello Mandyti45,
I’m happy to provide a more detailed answer:

1. Material and Moisture: The KALLAX is made of particleboard and coated with a melamine resin foil. This coating offers some basic water resistance but does not protect against prolonged high humidity or direct contact with water.

2. Issues with High Humidity: Particleboard absorbs moisture and can swell. This leads to warping or delamination of the surface. This mainly happens at relative humidity levels above 60% over an extended period.

3. Practical Tip: To prevent this, ensure the shelf is well ventilated. Avoid keeping the room air constantly humid and do not place the shelf directly against cold exterior walls, which often have moisture problems.

4. Additional Protection: There are special wood sealants or impregnations for furniture that can be applied. These help reduce moisture penetration but don’t guarantee complete resistance.

5. Long-Term Alternative: If you have very humid rooms, solid wood or metal shelves are better suited as they are less susceptible to moisture damage.

Summary: The KALLAX shelf can handle short-term moisture well, but prolonged high humidity is problematic. Proper ventilation and optional sealing can minimize damage. I hope this helps!

Hello everyone 🙂

Nabla64 schrieb:
2nd problem with high humidity: The chipboard absorbs moisture and can swell.

That’s exactly right – I have a KALLAX in my bathroom (yes, not the best idea, I know ;-)) and after two winters with high humidity levels, the edges have actually started to swell a bit. It’s not like I’m constantly worried it will tip over, but visually it’s noticeable.

My recommendation: it’s better to invest a bit more or choose a different solution for wet areas. Most of us can manage some ventilation, but the increased humidity often persists when it’s cold outside.

So, in short: KALLAX is not moisture-resistant, more like a piece of furniture for dry, cozy rooms. 🙂

KNUTGI schrieb:
After two winters with high humidity, the edges have actually started to swell a bit.

That's exactly what happens. When the indoor air is often humid, chipboard furniture suffers significantly. My KALLAX already has swelling on the lower edges. Ventilation and keeping a distance from the wall are essential.

Nabla64 schrieb:
KALLAX can handle short-term moisture well, but consistently high humidity is problematic.

Thanks for the detailed explanation! That really helps me with my decision.

I will definitely make sure to have adequate ventilation and check whether sealing really helps – do you have any recommendations for products that are specifically suitable for KALLAX or similarly coated particle boards?

And one more question: Would it help to place silica gel pads or similar in the room to reduce humidity? Or is that just a drop in the ocean for rooms that are constantly damp?