ᐅ Has anyone experienced damage from high humidity with the KALLAX?

Hello everyone,

I have a question that has been on my mind for a while, and I hope someone here has experience or can offer helpful advice:

Has anyone noticed damage to their IKEA KALLAX shelving unit due to high humidity levels in their home?

I bought the unit about a year ago, and it is located in my living room, which can sometimes get quite humid—especially in winter when I ventilate a lot and the outside air is very cold and damp. My concern is that moisture might penetrate the particleboard of the shelving unit and eventually cause warping, swelling, mold growth, or discoloration.

Maybe you can share your own experience regarding whether the wood or surface of the KALLAX modules reacts sensitively to moisture. Are there differences depending on the model or finish? And if you encountered any problems, how did you resolve or prevent them?

I look forward to your feedback!

Hello hardyki,

I completely understand your concern. Excessive humidity can generally cause damage to furniture made from engineered wood products, especially particleboard, which is often used in KALLAX units. These materials can swell and warp when exposed to moisture.

Manufacturers usually recommend not placing such furniture in overly damp rooms, or choosing items specifically designed for use in humid environments.

Good ventilation is therefore important, and sometimes it is enough to cover the shelves with a water-resistant protective film when placing them in bathrooms or basements.

Regarding your specific situation: I had a KALLAX in a kitchen a few years ago, where humidity levels were sometimes quite high. After about six months, minor swelling appeared, and the surface became slightly warped. Continuous ventilation and using a dehumidifier were the only effective solutions for me.

I hope this helps you for now!

KALLAX is not designed for damp rooms. High humidity almost always causes damage such as swelling. Ventilation and dehumidifiers are the only effective countermeasures.

gregto schrieb:
too high humidity can generally cause damage to furniture made from wood-based panels

Exactly. I would like to add that KALLAX shelves usually have a melamine-coated surface. This coating is quite resistant to moisture but not completely waterproof. If the humidity remains high for an extended period, moisture can penetrate the edges where the coating is thinner, causing the panels to swell.

This means you should avoid keeping the shelves continuously wet or damp. Direct water stains or condensation on the surface are also harmful.

If you heat and ventilate the room properly, you can significantly reduce the risk.

I can only confirm that KALLAX is not a good choice for rooms with high humidity. I had the shelving unit in the basement, which was often damp – after just a few months, the material swelled in several places.

My advice: regularly check storage areas and take immediate action if you notice any signs of moisture.

To add to the previous contributions, I would like to address some technical aspects relevant to moisture damage in KALLAX units:

KALLAX shelves are made from medium-density fiberboard (MDF) or particleboard with a melamine resin coating. While these materials are more durable than untreated particleboard, they remain hygroscopic – meaning they absorb moisture from the air.

High humidity levels (above 60% relative humidity) over an extended period can cause swelling, especially at unsealed cut edges and drill holes.

Furthermore, there is a risk of mold growth, particularly if the humidity is not only high but also persistent and there is insufficient air circulation.

My recommendations:
- Maintain indoor humidity consistently between 40-60%
- Regularly perform thorough ventilation (airing out)
- Treat shelf edges with clear varnish or wood preservative
- Avoid placing furniture directly against cold exterior walls

These measures help prevent moisture-related damage.