ᐅ KALLAX Shelves Splintering After Reassembly – Any Suggestions?

Hello everyone,

I recently assembled a new KALLAX shelving unit, but unfortunately, I immediately noticed that some of the shelves started to chip along the edges when inserted. This mainly occurs where the shelves are pressed into the mounting grooves. The load is still minimal, as the unit is practically empty. My question is: Is this due to poor workmanship, or did I make a mistake during assembly? Are there any tips on how to reinforce the shelves afterward or protect them from further chipping?

I carefully inserted the shelves, did not use any force, and fastened all screws according to the instructions. Still, visible damage is already apparent – this won’t hold up for long.

Has anyone had similar experiences or can provide a professional assessment? Thank you very much!

fenule schrieb:
My question: Is this due to poor workmanship, or did I make a mistake during assembly?

These are valid questions because this issue unfortunately occurs quite often with furniture in this price range. KALLAX shelves are made of coated particleboard, a material that can indeed be prone to chipping along the edges.

However, I would also like to ask how precisely you assembled the parts: Are all the joints neatly executed? For example, was the insertion of the shelves done with light pressure or sliding?

While the material may not be as durable as solid wood, excessive forcing or misalignment could explain the damage. It would be interesting to know if you checked the holes before inserting the shelves and if the shelves already had edge defects prior to assembly.

Additionally, it’s worth considering how these defects compare to the norm. Have you looked around to see if other users have reported similar quality issues?

BAUEVA schrieb:
Are all the joints properly finished?

To address the topic more thoroughly, I will try to explain the assembly process as precisely as possible, so that potential causes and solutions may become clearer.

Particle boards like those used in KALLAX are always designed with their load-bearing capacity and processing in mind. Splinters often occur at the core-fiber laminate interfaces along the edges, which can detach under pressure or shear stress.

The following sequence is recommended for assembly:

1. Unpack and inspect: Check all wooden parts for damage and splinters.
2. Pre-drill/check fit: Fixtures such as holes should not be too tight by 0.5mm (0.02 inches) or more — otherwise pressure increases.
3. Lightly sand the edges before inserting (fine sandpaper) — especially with particle board edges, this can reduce stress.
4. When inserting shelves, ensure a flat, even support and insert the parts parallel, avoiding angled pressure.

Even slight twisting of the shelf during assembly can promote splintering.

You mentioned 'no force applied,' but how is force defined here? Would slight pressure or misalignment count?

In conclusion: Material defects are rare; usually, it is the combination of tight fitting, imprecise drilling, and assembly method. I personally had a similar problem once, and had to reinforce the broken part with additional glue strips.

Particle boards tend to splinter if installed at an angle or with excessive force. Check that the edges are clean before installation and sand down any slight burrs. Then protect them with edge banding or felt.

First, I would recommend carefully treating the damaged areas with wood glue and clamping them if possible. This will help prevent the damage from getting worse.

Thank you for the helpful feedback so far.

@BAUEVA Since you asked about the fit: yes, the base surfaces and grooves matched well, but the holes or slots for the shelves are a bit tight. I unpacked the parts just now and did not notice any mechanical deformation before assembly.

@kibutar Thanks for the detailed explanation! By force, I mean I did not use brute force to insert the shelves, but applied gentle pressure. I couldn’t completely avoid slight tilting since the parts fit quite tightly. I’m not aware of any sanding of the edges, but I could definitely try that.

Yesterday, I didn’t even put any weight on the parts; I just left them standing on the shelf. The ones that are splintering mainly show surface damage on the outside with small white flakes.

I think my task now is to optimize the tight fittings and gently smooth the edges.