ᐅ Tips for Fixing Wobbly Walls in KALLAX Assemblies?

Hello everyone, I recently connected several KALLAX units to create a larger shelving system. Unfortunately, I noticed that the connected side panels feel a bit wobbly after assembly. A single unit is stable, but once shelves are combined, the side panels sometimes give way, which not only causes a “wobbly” feeling but also makes me concerned about potential long-term damage to the system.

I’ve read that some people use additional brackets or screws, and sometimes it’s recommended to reinforce the back panels or secure the entire structure to the wall.

I’m particularly interested in options to make the side panels more stable in a KALLAX combination without significantly altering the appearance or completely disassembling the unit. What techniques or tools have you used? Are there specific screws, brackets, or other materials that are especially effective? And is it advisable to add more back panels or extra stabilizers?

I would appreciate any tips that can help solve the problem of wobbly side panels in combined KALLAX shelves for the long term!

Hello janicklo,

Your question is clear and addresses the key issues involved in connecting KALLAX units. Essentially, KALLAX modules are designed for individual use; joining them together significantly increases stress, especially on the side panels and connection points.

My recommendation:

1. Back panels: Adding extra back panels greatly improves stability by preventing the structure from twisting. These should cover the entire joined area (possibly thin particle boards attached with wood glue and screws).

2. Angle brackets: Use sturdy metal angle brackets, ideally installed on the inside at the connection points. This minimizes movement between the units.

3. Screws: Supplement the original connectors with additional wood screws driven into the side panels, but be careful with the panel material, as overly long screws can cause cracks.

4. Wall attachment: If possible, secure the whole system to the wall – this is the most reliable way to stabilize it.

5. Place rubber pads or felt gliders under the shelving unit to compensate for uneven floors.

These measures have effectively reduced wobbling for me in the past without compromising the design.

Wall mounting is the best way to ensure nothing wobbles. Otherwise, use brackets inside at the joints and where it meets the floor – it’s straightforward.

tra_nina schrieb:
Additional back panels significantly increase stability

That is absolutely correct, but I would like to add that attention should be paid to the material and thickness of the back panel. The original KALLAX back panels are often only veneered MDF boards about 3 mm (0.12 inches) thick, mainly serving as dust protection.

If you want to achieve greater stability, I recommend replacing or supplementing them with plywood or multiplex boards at least 6 mm (0.24 inches) thick. These can be cut to size and secured further with screws or nails. It is important to fasten the back panel securely not only at the bottom edge but also at the top edge to prevent shear forces.

Furthermore, I recommend using steel flat brackets at the joints. These are screwed on the inside of the side panels and prevent the modules from shifting sideways. There are also special furniture connectors that provide additional stability, but they should be suited to the carcass material, as oversized holes can weaken the side panels.

One important question for you: How do you plan to use the assembled KALLAX system? Will it be freestanding or supported against a wall? Will it be heavily loaded, for example with heavy books or equipment? The stability requirements differ significantly depending on its intended use.

Nakar33 schrieb:
One more important question for you: How do you plan to use the assembled KALLAX system? Will it be freestanding or supported by a wall? Will it be heavily loaded, for example with heavy books or equipment?

Thanks for the detailed information! To answer your question: The shelving system will be freestanding, so without direct wall attachment, and it will mainly hold books and a few small decorative items. The total weight is estimated to be around 60–80 kg (130–175 lbs), distributed across all compartments.

The shelving unit will not be fixed directly to the wall because the furniture arrangement is meant to remain flexible. Therefore, a connection between the individual modules that is as stable and wobble-free as possible is very important.

Are thicker back panels particularly recommended for freestanding constructions? Or are brackets and connectors on the inside a better solution? What has been your experience with the material package, especially regarding aging and loss of stability over the years?

As a supplement to previous answers: For free-standing KALLAX connections, you might also consider so-called furniture connectors, which IKEA does not provide directly but are available from third-party suppliers. These connectors allow a secure coupling of multiple units without visible external joints.

Additionally, I recommend, if possible, to slightly align the individual units before connecting them so that the shelves are at the same height – this reduces stress on the side panels and minimizes lateral wobbling.

It is also helpful to lightly screw the shelves together if you are not using a back panel.

Important: It is advisable to pay attention to the maximum load per compartment, as overloading—even with securely connected KALLAX units—can lead to warping of the side panels over time.