ᐅ Mold in the compartments of a KALLAX after basement storage – any experiences?

Hello everyone,

I recently used a KALLAX shelving unit from IKEA for storage in my basement. Unfortunately, when I was emptying it, I discovered mold had formed in some of the compartments—mainly on the inner sides of the carcasses and partly on the wooden material itself.

I’m interested to know if anyone else has had similar experiences with a KALLAX shelf left in a basement for an extended period. What were the conditions in your basement (temperature, humidity)?

Most importantly, what measures did you take to address the mold growth inside the compartments? Are there effective methods to keep the furniture mold-free permanently or at least treat it preventively?

I’m looking forward to your tips and experiences, as I would like to keep the shelving unit and not dispose of it right away. Thanks in advance!

zarje schrieb:
What are the conditions like in your basement (temperature, humidity)?

That’s already half the challenge. Basement storage and KALLAX furniture – that almost sounds like a recipe for mold-friendly conditions. I would even say: If a basement room consistently has over 60% humidity, mold is practically inevitable. IKEA furniture is inexpensive and often not moisture-resistant.

zarje schrieb:
Are there effective methods to keep the furniture mold-free permanently?

The best method is to completely remove the shelf, sand it down, and treat it with a protective coating. Anything else is just a temporary fix as long as the basement stays damp. Cleaning won’t help. Only drying out the storage area will provide a long-term solution.

KALLAX in the basement? A better idea is to find a storage space with consistent dryness. Remove mold by applying alcohol or a vinegar solution, then ventilate. Eliminate moisture, or the mold will return.

Hello zarje,

I completely understand your concern. Furniture made from particle board, like the KALLAX, is very sensitive to moisture and mold growth because it causes the material to swell and the surface to soften.

When storing in a basement, it is important that the humidity ideally stays below 60% and the temperature remains as stable as possible. It’s best to use a hygrometer to monitor this.

What you can do:
- Treat mold with a mild vinegar solution (30% vinegar to 70% water).
- Let the affected areas dry thoroughly.
- Then apply a fungicide or special wood preservative.
- If possible, do not place the shelf directly against the wall; leave some space for air circulation.
- Use dehumidifiers in the basement if humidity is high.

If the infestation is too severe, often the only solution is to replace the affected boards or buy a new unit.

I hope this helps you a bit. 🙂

Mold in KALLAX after basement storage is normal if the humidity is high. Ventilate the basement or use a dehumidifier. Once mold has appeared, there is always a risk of recurrence. Slightly sealing or painting wooden furniture also helps.

I had the same problem. To keep it brief: remove the entire shelf, clean the mold with chlorine cleaner, let it dry thoroughly, then seal it with a water-based clear coat. Since then, no more mold.