ᐅ Is the Kallax sturdy enough for storing files over several years?

Hello everyone, I am considering using my Ikea Kallax shelf for long-term file storage. My question is: Is the Kallax shelf truly sturdy enough to safely hold heavy binders over several years without the material warping, the shelves sagging, or the frame getting damaged? I know that Kallax is made from particleboard with a melamine coating, but how does it perform in terms of load-bearing capacity over time, especially when stacking many binders and not frequently rearranging them? I would really appreciate any experiences and assessments on this topic.

A valid concern, especially for long-term storage of files that are often heavy and bulky. The Kallax shelf unit is basically made of particleboard, but it is quite robustly constructed and coated with melamine resin, which reduces moisture absorption. Two factors are important here: first, the correct load distribution—ideally even, without overloading individual compartments. Second, the assembly: When screws and connections are tightened carefully, this significantly improves stability.

gunnarflo schrieb:
und nicht ständig umordnet?

The issue with infrequent rearranging is that stresses remain static over time. This can lead to long-term deformation of the shelves, especially for wide shelves without additional supports. One possible improvement is using shelf supports or inserts made of metal or MDF to better distribute the load.

gunnarflo schrieb:
ob sich das Material verzieht

Warping and sagging are mainly a risk when the shelf is exposed to very high humidity or large temperature fluctuations. In consistently dry, temperature-controlled office environments, this is less of a problem.

In the end, it might be worth considering additional bracing or cross supports for the Kallax if it will carry heavy loads over a long period. For moderate amounts of files and regular checks of stability, however, it has proven quite suitable in my experience.

The Kallax easily holds binders as long as you don’t overload the shelves. Distribute the weight evenly for long-lasting stability. For heavy items, it’s better not to fill compartments completely.

I have been using the Kallax for files for 5 years with no issues. Important: Don’t put too many binders in one compartment, or the shelves will sag. I didn’t rearrange them regularly, but it still held up well.

Thank you for your feedback! @TEBILO: I find your points about the influence of humidity and temperature very relevant. Could you possibly specify from which shelf width deflections typically occur? And are there any special methods to reinforce the original shelves without compromising the appearance of the shelving unit or requiring extensive modifications? I am concerned not only about stability but also about maintaining the look as much as possible.

I’m happy to explain in more detail. The clear internal dimensions of the standard Kallax compartments are 33x33 cm (13x13 inches). How much sagging occurs largely depends on the weight – for example, file binders typically weigh around 3-5 kg (7-11 lbs) each. Having 5-6 binders per compartment (about 20-30 kg or 44-66 lbs) is already near the upper limit. From approximately 25 kg (55 lbs) per compartment, noticeable sagging can occur, especially as the material ages or if moisture penetrates the particleboard.

For reinforcement, I recommend:

1. Screw or glue a thin metal strip or angle bracket underneath the shelf. This keeps the board straight and more load-bearing.

2. Use additional shelves made from MDF with steel reinforcements. This is discreet and minimally impacts the look.

3. Attach cross braces behind the shelving unit to prevent sagging of entire shelves.

Avoid replacing shelves with thick wooden boards, as these significantly change both the appearance and the weight.

gunnarflo schrieb:
Optik einigermaßen erhalten bleibt

Although the shelves supplied by Ikea are not solid wood, by adding metal reinforcements you can subtly increase their rigidity without compromising the design.