ᐅ Kallax stored in the attic – does it warp due to heat or cold?

Hello everyone, I have a question regarding storing Kallax shelves in the attic – will the furniture warp due to extreme heat or cold?

I am considering storing my Kallax shelves in an unfinished attic, which gets very warm in summer and quite cold in winter. Since Kallax is made of coated wood-based panels, I am unsure how temperature fluctuations and humidity might affect the material over time.

Has anyone had experience with Kallax shelves warping or getting damaged when exposed to such conditions for an extended period? If so, are there any storage tips to help prevent this?

I look forward to your insights!

felidu schrieb:
"Kallax stored in the attic – does the furniture warp from extreme heat or cold?"

Great question! I’ve seen Kallax shelves stored in attics quite often, and honestly, they hold up pretty well 🙂 Of course, it’s best if the temperature doesn’t get too extreme, but Kallax is fairly durable!

Sure, very high heat or humidity can cause some slight swelling or minor warping. However, if you ventilate the room a bit and keep an eye on the humidity levels, it’s usually not a big issue. The material isn’t solid wood, but MDF with a laminate finish – which also helps protect against small fluctuations.

In summary: no need to worry, just check on it occasionally! That way, you’ll enjoy it for much longer. Yay!

todunar schrieb:
"Kallax is quite sturdy!"

Regarding Kallax on an unfinished attic, I would like to add some factual points:

1. Kallax is made from a wood-based panel (MDF) with a foil coating. MDF is more sensitive to temperature changes than solid wood. With significant temperature fluctuations, the material can easily expand or contract.

2. In an unheated attic that can become very warm in summer (up to 40°C (104°F)) and very cold in winter (below 0°C (32°F)), these fluctuations are more pronounced than in living spaces.

3. Moisture is an additional factor: high humidity or condensation can cause the material to swell and damage the coating.

4. Warping may occur, especially if the furniture is not regularly ventilated.

My recommendation: If you plan to store the shelf there long-term, the space should at least be well ventilated or temperature-controlled. Alternatively, the furniture could be protected from moisture with covers or foil. For permanent storage in an attic space, Kallax is only partially suitable.

felidu schrieb:
"Kallax stored in the attic – does the furniture warp due to extreme heat or cold?"

This is a valid question. Especially for particleboard or MDF, as used in Kallax, temperature and humidity resistance is limited. However:

- The laminate coating provides some protection against moisture, but under extreme conditions (e.g., high humidity combined with intense heat or freezing temperatures) material changes can occur.

- Furniture manufacturing under ideal climatic conditions usually assumes 18-22°C (64-72°F) and about 45-65% relative humidity.

- Unheated, uninsulated attics often experience much wider fluctuations.

I would advise against storing it there long-term due to the risk of damage, especially if you plan to use the furniture often or want to keep it looking good. For purely temporary storage in boxes or wrapped in plastic, it’s a different matter.

How long are you planning to store it? That might affect the assessment.

BAUEVA schrieb:
"How long are you planning to store it?"

Good question! The duration definitely matters.

In my experience, storing it for a few months is not a problem for the Kallax. However, if you store it for longer than six months or through multiple seasons, the risk increases.

One tip: Don’t place the Kallax directly on a cold floor; instead, use an underlay. This helps prevent moisture from below.

Also, ventilate regularly to avoid condensation.