ᐅ The Kallax shelving unit never stays stable for me – what am I doing wrong?

Hello everyone, I have been experiencing an issue for some time now where my Kallax shelf never stands completely stable, whether it is fully assembled or only partially loaded. It always wobbles slightly, which is quite uncomfortable, especially with the larger models. I have tightened all the screws, attached the supplied metal brackets at the back, and even tried securing the shelf to the wall, but the stability remains unsatisfactory.

My specific question is: What mistakes during assembly or use could cause the Kallax to remain unstable? Are there any special assembly techniques or additional measures that I might have overlooked? I would appreciate well-informed advice, including references to common weak points or fixes that I could try.

Eliosu schrieb:
I have tightened all the screws, attached the supplied metal brackets at the back, and also tried to fix the shelf to the wall

That sounds very thorough. In my experience, with Kallax shelving units, the connection between the individual panels of the carcass is often the critical point. If simple wooden dowels are used instead of plastic anchors or low-quality connections, this can lead to a less stable structure over time. Also, when fixing it to the wall, make sure the screws are inserted at the correct angle and that the appropriate anchors for the wall type have been used. Too much play in the wall attachment will not provide much additional stability. Additionally, if a solid wall fixing is not possible, attaching an extra stiffening panel made of thin plywood to the back can help. This significantly reduces wobbling.

Check if the floor is really completely level. Often the shelf stands on a slightly uneven surface, causing it to wobble. If necessary, place small felt pads or spacers under the feet.

Eliosu schrieb:
What mistakes during assembly or use could cause the Kallax to become unstable?

To address the problem precisely, you should first check whether all the connection points of the shelf are properly assembled. Kallax uses a lot of particleboard, which is sensitive. If the connectors or dowels are not fully inserted or if glued joints are not properly clamped, this significantly reduces stability.

Furthermore, the installation location plays a role: a floor that deforms or shifts under load will transfer these movements to the shelf. With very heavy loads in the open compartments (e.g., a large number of books), the panel in the middle can bend slightly – which makes the shelf less stable.

What might help you:
- Check the remaining openings in the carcass for loose joints
- Tighten the screws again and try to fix the shelf to the wall on two opposite sides
- Possibly add a thin and lightweight support panel at the back, since the original back panel is often very thin and has little structural rigidity

Could you please describe in more detail how you load the shelf and where it is located?

Nakar33 schrieb:
Could you please describe in more detail how you load the shelf and where it is located?

I think this follow-up question is very helpful, because without knowing the exact situation, it’s difficult to find a good solution.

Perhaps the wobbling feels uncomfortable for the original poster because it affects daily life – especially when you want to rely on order or appearance. Have you considered placing the shelf in a less frequently accessed area, where the wobbling would be less noticeable?

Also, if you are placing heavy items on it, I would recommend using the lower shelves and consistently storing the heavier items at the bottom. This lowers the center of gravity, which generally improves stability.

barle schrieb:
Check if the floor is really completely level.

This is a point I agree with, as you often see small unevenness even in modern apartments. A simple spirit level quickly provides clarity.

brianna schrieb:
to consistently place the heavier items on the bottom

Exactly – proper load distribution is essential. Additionally, I recommend fitting the feet of the shelf with small, non-slip pads that can also compensate somewhat for unevenness. Combined with a fixed back panel, this should make the shelf significantly more stable.