ᐅ KALLAX in the storage room – problems with persistent moisture?

Hello everyone,

I have an IKEA KALLAX shelving unit in my storage room for storage purposes. Unfortunately, I have noticed that the room is quite damp—there is noticeably increased humidity, especially in winter, probably due to poor ventilation and a damp wall. The problem is that the KALLAX shelves are made from wood-based panels, and I’m concerned that the constant moisture could cause the shelves to swell or even develop mold.

Does anyone have experience using KALLAX in such a damp environment? What precautions can be taken to prevent damage? Would special waterproofing treatments be advisable, or is it better to choose a different material?

I look forward to your advice and experiences!

That sounds really frustrating, having a damp corner at home. I’ve also noticed that wooden fiberboard shelves in the basement tend to swell slightly when the humidity stays above 60% for a prolonged period.

Maybe it would help to apply a wood preservative treatment before assembling, one that protects against moisture absorption. Unfortunately, this doesn’t always work perfectly, especially with cheap particle boards.

The advice to ‘just ventilate’ is obviously difficult in storage rooms without windows. Perhaps a small dehumidifier could help? I’m not sure if that’s an option for you.

From a technical perspective, KALLAX is not designed for permanently damp rooms. The wood-based panels used are susceptible to swelling and potential mold growth if exposed to moisture over an extended period.

As preventive measures, I recommend:

1. Monitoring humidity levels with a hygrometer; ideal values are below 60%.
2. Using dehumidifiers or at least regularly ventilating the space, if possible.
3. Applying a protective finish with wood varnish or a specialized impregnating product to make the surface water-repellent.
4. Maintaining a gap from the floor and walls to allow air circulation.

As an alternative, metal or plastic shelving units can be used, as they are hardly affected by moisture.

roryvin schrieb:
KALLAX is indeed not designed for permanently damp rooms

That unfortunately confirms my suspicion.

FLONE41 schrieb:
Impregnation with a wood preservative

– could you possibly recommend a specific product that has proven to be effective in the long term?

It is important to me to avoid temporary solutions that might dry out or cause problems again after a few months. Also, do you have any experience with combining dehumidifiers and impregnation? Do both measures together offer better protection, or is that overrated?

First: Applying a protective treatment is generally advisable to make wood-based materials more resistant to moisture. However, a suitable product designed for interior use must be selected, one that remains permanently water-repellent while still being breathable to avoid trapping condensation.

Products based on acrylic or polyurethane are common; for example, beeswax or liquid waxes are less suitable as they do not provide sufficient protection.

Regarding combined use: A dehumidifier helps lower the relative humidity permanently, which is very important since a protective treatment alone cannot guarantee 100% protection under constant moisture conditions. Taken together, this can significantly improve the material’s durability.

It is also important to promote air circulation, for example by placing furniture on feet or leaving a gap from the wall.

Wooden shelves are not suitable for damp rooms. Keep them off the floor, use a dehumidifier, and treat the wood with a protective coating. Otherwise, it is better to use metal shelves.