ᐅ Who has installed KALLAX in the bathroom – any issues with mold?

Hello everyone,

I have decided to use a KALLAX shelf from IKEA in my bathroom to store towels and personal care products. However, I am concerned about a potential mold problem due to the high humidity in the bathroom.

Has anyone installed KALLAX in their bathroom and can share whether mold occurred because of the moisture? I am especially interested in how air circulation is at the back and inside of the cubes, whether any specific moisture protection measures were taken, and if the shelf’s design increases the risk of mold.

Additionally, I would like to know if there are any special tips for placement and maintenance to prevent moisture damage. Thank you in advance for your feedback!

I have a KALLAX unit in the bathroom. It is important not to place the shelf directly against the wall to allow air circulation. Regular ventilation and not leaving wet towels inside are essential. I did not have any mold.

busar schrieb:
I’m especially interested in how the air circulation is at the back and inside of the boxes

This is a crucial point. KALLAX shelves are made of particleboard with a melamine-coated surface. While the surfaces are water-resistant, the edges are often sensitive to moisture because they are only covered with a thin edge band.

If the shelf is placed flush against the wall, condensation can form near the back panel, especially in a bathroom with high relative humidity and limited ventilation. This creates ideal conditions for mold, particularly on the back and underside of the shelf.

I recommend separating the shelf from the wall using spacers (e.g., small felt pads or plastic feet). Additionally, make sure no standing moisture collects inside the shelf, so avoid storing damp towels or wet items there for extended periods.

Furthermore, using an additional dehumidifier in the bathroom can help stabilize the indoor climate.

How is the ventilation in your space? Do you have a window or mechanical exhaust?

PLOMA schrieb:
How about ventilation in your place? Do you have a window or a mechanical exhaust?

Thank you for the detailed answer! Yes, I have a window that I always open well after showering, but often the shelf is placed very close to the wall because the room is limited in size.

Repar schrieb:
not placing the shelf directly against the wall so air can circulate

I have thought about that, too. I will try to raise the shelf on some small spacers. In my opinion, it would also make sense to check the inside surfaces occasionally, since the melamine-coated surfaces repel moisture well, but the edges are less protected.

Are there any recommendations on how to protect such edges? Painting or oiling is rather unsuitable for MDF.

busar schrieb:
Are there any recommendations on how to protect such edges? Painting or oiling is rather unsuitable for MDF.

In fact, the edges on IKEA-KALLAX are often sealed with a thin plastic edge banding, which is not completely waterproof.

To provide additional protection against moisture, special edge sealants or two-component clear coats can be used. These must be suitable for engineered wood products and applied carefully, as moisture can penetrate through micro-cracks otherwise.

Alternatively, acrylic or silicone sealants can be applied to further seal the edges. It is important that the sealant remains flexible to prevent cracking due to expansion.

Additionally, the shelf should be kept regularly dry, and moist cloths or wet textiles inside it should be avoided.

Another important factor is indoor humidity: for bathrooms, a relative humidity below 60% is considered good. A hygrometer can help monitor this and, if necessary, a dehumidifier can be used to control the moisture.

What are the room conditions like? Do you ventilate only through windows, or is there also mechanical ventilation?

busar schrieb:
I will try to place the shelf on a few small stands.

I think that is a very good step. A small gap of a few centimeters (inches) from the wall can significantly improve air circulation and help prevent moisture buildup.

Additionally, if possible, I recommend treating the back wall area with a special moisture protection, such as water-repellent membranes or film-forming coatings that should remain breathable to minimize condensation.

Another option is to use open containers or baskets on the shelf, which provide better ventilation than closed drawers. This allows air to circulate more effectively.

Regular ventilation through a window is essential, but a fan or an exhaust system with sufficient capacity is often even more helpful, especially in smaller or windowless bathrooms.

Measuring the moisture level on the wall behind the shelf with a suitable moisture meter can provide additional clarity.