ᐅ Who here has ever had to replace Kallax shelves?

Hello everyone,

I have a rather technical question regarding the popular IKEA Kallax shelving system: Has anyone here ever needed to replace Kallax boards? Specifically, I’m interested to know if anyone has figured out which types of screws or adhesives work best for the fixed connections, what alternative materials could be used for the boards, or if it only makes sense to repair it by replacing the entire unit.

I’m asking because a few of my boards are slightly damaged in some spots, and I’m unsure whether a partial replacement makes sense technically and economically—especially concerning load-bearing capacity and appearance.

Are there any recommendations for tools or techniques to replace Kallax boards yourself without having to dismantle the entire unit?

I look forward to your experiences, tips, or warnings if anyone has done such repairs before. Thanks!

fa-matthia schrieb:
if anyone has been able to find out which type of screws or glue work best for the fixed joints

The Kallax boards are typically made of particleboard with a melamine resin coating, and the connections are mostly made using simple wooden dowels and pre-assembled screws.

Simple repairs using glue are rarely reliable because the surface is very smooth. For replacement boards, commonly available MDF panels with a thickness of 16 mm (5/8 inch) are recommended, which can be cut to size.

For screws, I always use original Spax screws with countersunk heads, 4x30 mm (4x1 1/4 inch) or 4x50 mm (4x2 inch) for secure holding. It’s important to disassemble the shelf beforehand to replace the boards without load, as otherwise this might cause problems.

Tools: A cordless drill with depth stop, a dowel set, and wood glue (PU adhesive) provide the best stability.

Replacing boards usually only makes sense if they are actually broken. Otherwise, filling and sanding is sufficient. You need to use screws from a specialized supplier that match the originals exactly; otherwise, the shelf will be unstable.

fa-matthia schrieb:
I ask because some of my boards are slightly damaged in a few places, and I’m unsure whether partial replacement makes technical and economic sense.

I have looked into repairing Kallax shelves in detail. These shelves are basically made from 16 mm (5/8 inch) thick boards covered with a melamine resin coating. The coating makes it difficult to apply adhesive that will hold permanently, especially since the load often acts across the grain direction.

A targeted replacement is recommended if the damage affects load-bearing capacity or significantly impairs the appearance. A high-quality cut from MDF with the appropriate melamine coating (make sure the edges are professionally sealed) is necessary.

Pay attention to the connection methods: Kallax uses wooden dowels for the longitudinal joints, plus screws. If you replace only one board, you often need to disassemble the entire unit to avoid damaging the dowel alignment.

When installing, use a sharp chisel carefully to clean the dowel holes and insert the screws exactly in the designated spots. Make sure to screw in properly without applying too much pressure, to prevent the chipboard from splitting.

One more question: How severe is the damage and which boards are affected? Shelves or side panels? This influences the repair approach.

Gafiel schrieb:
One more question: How severe is the damage and which boards are affected? The structural boards or the side panels?

Thank you for the detailed response! The damage mainly concerns the vertical partition walls, meaning the inner boards, some of which have chipped edges and appear slightly unstable. However, they are not completely broken, more porous at the ends. The side panels are intact.

I’m concerned that with further stress, the overall stability of the module will be compromised. Replacing the partition walls therefore makes sense, right? And would simply cutting MDF panels be sufficient, even if the surface isn’t melamine-coated, or do I need to order something more specific?

fa-matthia schrieb:
The issue mainly concerns the vertical dividing panels, that is, the inner boards, which are sometimes chipped at the edges and appear slightly unstable

When replacing the vertical dividing panels, it is essential to use boards with the same thickness and edge strength. If you cannot obtain melamine-coated wood, it is worthwhile to seal the edges with ABS edge banding to prevent moisture penetration.

Even though these walls are not visible behind drawers or boxes, moisture protection remains important. MDF is not inherently bad, but typically, chipboard or coated MDF with a thickness of 16mm (5/8 inch) is standard for Kallax units.

For smooth assembly and long-term stability, it is also recommended to replace all dowels, as they often deform during disassembly.