ᐅ My Kallax unit becomes less stable after each loading and unloading – any ideas for stabilizing it?

Hello everyone,

I have been using a Kallax shelf unit from IKEA for some time now for various purposes. Unfortunately, I have noticed that the shelf becomes increasingly unstable after organizing and rearranging it, meaning loading and unloading the compartments. It sometimes starts to wobble or creak, and it feels somewhat "looser" than when it was new, even though I generally don’t overload it or handle it roughly.

Has anyone else experienced something similar? What could be causing my Kallax unit to lose stability with use? I have considered whether the joints might loosen over time or if the material itself simply loses elasticity or strength.

I’m also interested in your opinions on possible measures or reinforcement ideas that could help keep the shelf stable in the long term. Are there any effective reinforcements or tricks that can be applied to a Kallax shelf without making it look unattractive or restricting its function?

Thanks in advance for any feedback!

Domoritz schrieb:
that the shelf becomes increasingly unstable after each organizing and rearranging

That sounds really frustrating, especially when you’re careful not to overload the Kallax.

I had a similar issue with one of my shelves. In my case, it helped to carefully tighten all screws and connections again because they can actually loosen over time.

Sometimes a bit of wood glue at the joints can provide extra stability, especially if you secure them properly afterward.

Have you checked if anything is warped? This often happens with the side panels, especially if the shelf is moved frequently.

I hope you find a good solution. Don’t get discouraged—furniture like this kind of grows with us, imperfections and all ;-)

Domoritz schrieb:
Has anyone else had similar experiences? What could be causing my Kallax shelf to lose stability with use?

From a technical perspective, instability in a Kallax shelf often results from the following factors:

1. Loosening of fasteners: Screws, dowels, or connectors can loosen over time due to vibrations caused by regular use.

2. Material fatigue: Since Kallax is primarily made of particleboard-based materials, exposure to moisture or prolonged use may reduce its stiffness.

3. Uneven loading: Concentrated loads or frequent changes in load distribution can stress the structure.

To improve stability, I recommend:

- Checking and, if necessary, retightening all connection points using the original screws or suitable replacements.
- Installing additional metal angle brackets inside the corners. These help significantly increase stability.
- Using back panels made of plywood or thin MDF if not already present, as they prevent lateral twisting.
- Avoiding excessive exposure to moisture to prevent material deformation.

These measures are scientifically supported and are commonly recommended by furniture workshops.

Domoritz schrieb:
What could be the reasons that my Kallax loses stability with use?

The back panel of Kallax shelves is often underestimated. It plays a key role in stability, acting as a diagonal brace.

If the back panel is damaged, only loosely attached, or thin, there is a risk that the shelving unit will twist over time and become unstable.

JAFUHAU schrieb:
Sometimes a bit of wood glue at the joints can provide extra strength.

That’s a good tip. To add, when using wood glue, it’s important to ensure all parts are well clamped—without proper fixing, the glue cannot cure correctly.

I also recommend placing the shelving unit on a level, solid surface and considering small felt or plastic pads under the feet, as an uneven floor can cause stress on the connections.

Additionally, I have had good experience securing the shelf to the wall with corner brackets. While this doesn’t fully restore free movement, it effectively prevents wobbling and increases the sense of safety.

pikin schrieb:
Attaching additional angle profiles inside the corners

In my opinion, this is the most effective solution. Just screw short metal brackets into the corners and you’re done.

Takutau schrieb:
Fixing L-brackets to the wall

I would do this as well if the shelf is going to be placed against a wall. It really prevents movement and greatly increases stability.

If you want to use the shelf as a mobile unit, I would still attach the brackets inside but skip fixing it to the wall.