ᐅ What should you do if the back panel of your KALLAX unit keeps peeling off?

The issue stems from the design of the IKEA KALLAX, which is optimized for cost-effective mass production and simplicity. The standard back panel is usually made of thin hardboard or OSB material, intended for lateral bracing but mechanically fragile.

Chipping typically results from mechanical stress at the fixing points or from poor glue quality on the engineered wood.

Steps for a lasting improvement:

1. Remove the back panel and clean the back area thoroughly.
2. Cut a new back panel to size from 4 mm (0.16 inches) plywood or veneered plywood.
3. Attach wooden frame strips (approximately 12–15 mm (0.5–0.6 inches) thick) made of solid wood (for example, pine) to the inner edges of the carcass using wood glue and pilot-drilled screws.
4. Apply wood glue to the new back panel and secure it from the inside with screws; use screws with small washers to protect the material.
5. Countersink the screw holes in advance to prevent the new back panel from splitting.

Following this sequence prevents renewed chipping caused by load concentration and significantly increases rigidity.

Do you have any questions about specific types of screws or adhesives?

TEBILO schrieb:
Do you have any questions about specific types of screws or adhesives?

Thank you for the detailed explanation! So far, I have only used standard wood glue and partially fixed the back panel with small nails.

Are there specific types of adhesives that work particularly well with MDF or hardboard panels? And what about screw sizes – should I use thinner, finer screws, or can I use thicker ones if I pre-drill?

Ge-ernst schrieb:
Are there specific types of glue that work particularly well with MDF or hardboard panels?

Yes. Wood glue for photovoltaic systems is generally suitable, and for MDF and hardboard, D3 or D4 glues are also good options—they are water-resistant and provide a strong bond. The latter types are ideal if there might be exposure to moisture.

Ge-ernst schrieb:
What about screw sizes – should I use thinner, finer screws, or can I use thicker ones if I pre-drill?

You should use fine wood screws with a diameter of 3-4 mm (0.12-0.16 inches). Pre-drilling is essential to prevent the panel from cracking. The length depends on the thickness of the back panel plus the strip, usually 25-35 mm (1-1.4 inches) is sufficient.

It is better to use self-drilling screws for chipboard. They hold better and are less likely to cause splitting.

By the way: If you want to treat the back panel with paint or varnish, do it before installing it! This helps reduce water absorption, which in turn minimizes flaking.

And yes, a bit of sanding before assembly works wonders 😎

Additionally: If the back panel is only chipped in small areas, you can fill these spots with wood filler and then sand them down.

However, this method is only suitable for temporary repairs and hardly improves stability.

For a permanent solution, replacing the back panel as described is recommended.