ᐅ Kallax as a rolling bench is not stable – does anyone have any ideas?

Hello everyone, I recently bought an IKEA Kallax shelf to use it as a rolling bench. Unfortunately, I found that the construction is not really stable in this setup – the shelf wobbles and doesn’t feel safe when sitting on it or leaning against it. I suspect that the weight distribution with the casters and seating use is different from what the shelf was originally designed for. Does anyone have experience with this or know effective solutions to improve its stability? I want to avoid just gluing everything together or adding unnecessary reinforcements. Tips for assembly, suitable casters, or alternative ideas are very welcome!

Hello fadyba,

I am familiar with the issue of using a Kallax as a rolling bench; the shelf unit is basically not designed to bear loads at seating height. Here is a structured approach to stabilize it:

1. Choice of casters: Select high-quality casters with locking brakes and sufficient load capacity (at least 50 kg (110 lbs) per caster).

2. Additional reinforcements: Inside the frame, you can install cross braces made of wood or metal to prevent twisting.

3. Base plate: A sturdy wooden board underneath the shelf supports the entire structure and distributes the weight more evenly.

4. Caster installation: Mount the casters on a reinforced base plate that is securely attached to the unit.

5. Seating surface: A padded board placed on top and fixed with screws helps avoid localized sagging.

Very important: The unit must not be loaded only on the sides, as this can cause tipping or warping.

If you like, I can provide a simple sketch or exact measurements that have worked well for me. Often, the problem lies in the combination of factors rather than just a wrong caster or missing reinforcement. 🙂

KUDAISY schrieb:
Here is a structured approach to stabilization

Thank you for the overview, that sums it up well.

I would like to add some information on the material properties: Kallax is made of compressed particleboard with a melamine coating – this means that twisting and localized stresses quickly become an issue. Especially with casters that move, shear forces occur around the screw connections.

My recommendations would be:
- Always protect screw connections from plastic deformation by using washers.
- Reinforce the corners with steel brackets, preferably installed on the inside.
- Attach a low cross brace at the front to prevent the front from bending.

It would also be helpful to know the maximum weight expected on the bench and whether it will be used temporarily or continuously. Do you use the casters daily, or is the bench mostly stationary?

Attaching casters directly to particleboard can cause fatigue quickly, so using a plywood or solid wood board as a base for mounting the casters can work wonders.

What exactly have you installed so far? Casters under the Kallax bottom panel, or screwed to the sides? How wide is the shelving unit?

lorena schrieb:
It would also be helpful to know the maximum weight expected on the bench

Thanks for the question, that’s indeed important. The bench is primarily intended as seating for up to 2 people weighing a total of about 140 kg (310 lbs). So it won’t be subjected to heavy continuous loads, but rather occasional use.

lorena schrieb:
Directly attaching casters to particleboard can lead to quick fatigue

I screwed the casters directly onto the bottom of the Kallax frame, without an additional base plate. The casters are basic furniture casters from a hardware store, without locking function and relatively inexpensive.

KUDAISY schrieb:
Attach cross braces made of wood or metal

That sounds reasonable. I will give it a try. Is there any recommendation on how many braces and their most effective positions?

That sounds exciting! 🙂 I once took on a similar project myself and can only say: reinforcement is essential! Especially with flexible furniture like Kallax.

In my project, I added a cross brace in the middle in addition to the corner casters, which not only increased stability but also almost completely eliminated squeaking!

And: invest in really good casters. Cheap casters deform quickly under weight, which is not a good foundation. For me, casters with a metal core and rubber tires were the key.

Good luck, it’s going to turn out great! 🙂

Use casters with a locking brake and install cross braces. If necessary, attach a plywood board as a base before mounting the casters.