ᐅ KALLAX shelving unit splitting at the joints – what can be done?

Hello everyone,

A few weeks ago, I bought a KALLAX shelf from IKEA, and unfortunately, I noticed today that it appears to be splitting or developing small cracks at several connection points. Especially where the individual boards are screwed or joined together, the wood seems swollen in some areas, and there are also small chips in some places.

The shelf is neither exposed to direct sunlight nor to moisture. The load is fairly moderate, just normal books and decorative items.

Has anyone experienced similar problems? What could be the cause, and how can this be effectively and permanently repaired or prevented?

I would really appreciate any advice, as the furniture is otherwise very practical and visually appealing, but of course, it’s frustrating when it shows damage.

Thanks in advance!

mikolaj schrieb:
Especially at the points where the individual boards are screwed or connected together, the wood appears to have swollen in parts

That does sound really frustrating, especially since the shelf is supposed to be designed for normal use.

I once had a similar issue with a comparable KALLAX where the material slightly “moved” around the screw connections, causing small cracks to appear. Sometimes the problem is that the screws are tightened too much, putting stress on the wood.

Maybe it would help to very gently loosen the screws a little and repair the cracks with wood glue.

I know this isn’t a perfect solution, but it helped me avoid more serious damage and kept the shelf usable for a long time. Hopefully, this gives you some ideas to start with!

Take a look: if joints are popping open, the following often helps: check the screws, possibly reinstall them with wood glue, and avoid overtightening. If the shelf has become damp, moisture barriers can be helpful.

Hello Mikolaj,

I can understand the situation well. KALLAX shelves are made of coated particleboard, which can be particularly sensitive at the joints when subjected to stress or moisture.

My recommendation would be:

1. First, check if the screws are all tight, but not overly tight. Over-tightening can damage particleboard.

2. If there are cracks, you can carefully treat them with suitable wood or furniture glue. Wood glue works well because it penetrates the fibers and provides stability as it dries.

3. Make sure to clean the surfaces thoroughly before gluing and, if possible, lightly sand them to help the glue adhere better.

4. Repainting with a matching paint can offer protection if the coating is damaged.

Alternatively, replacing individual damaged boards could also be an option if feasible.

I hope this helps!

I think most people actually use a KALLAX as a short-term solution because these units really aren’t sturdy solid wood shelves.

But don’t worry, you don’t have to throw it away right away. A little wood glue, some patience, and in the end, just be careful not to tighten the screws too much – that’s usually enough. And hey, a well-repaired KALLAX somehow has its own unique charm ;-)

Important: Never force the screw holes wider, as this will weaken the hold. And if it helps, try not placing it flush against the wall; sometimes that can work against the whole structure (a bit of slight movement can do wonders).

Moisture excluded? Are you sure? KALLAX in particular deteriorates quickly if a window is left open overnight or if there is too much humidity in the summer.

Otherwise: check the screws, apply glue to the cracks, then clamp. That’s the most you can do.