ᐅ Upgrading KALLAX Shelves for Heavy Loads – Where Can You Find Them?

Hello everyone,

I’m looking for a way to get shelves for my IKEA KALLAX unit that are specifically designed to support very heavy loads. The standard shelves are intended more for light to medium loads. However, I want to use the unit primarily for heavy books, tools, and similar heavy items, so I’m searching for retrofit shelves or another solution that will keep the unit stable and prevent sagging.

Does anyone know of suppliers or special products to upgrade KALLAX shelves for high weight capacity? Or perhaps alternative DIY ideas that are reliable and sturdy? Thanks in advance for any tips and experiences!

Hello Savas,

Your concern is quite common, especially since KALLAX shelves tend to sag under heavy loads. A typical IKEA shelf panel is made of compressed particleboard with a thin melamine coating and usually supports around 10-15 kg (22-33 lbs) per shelf.

For heavier loads, there are actually several options:

1. IKEA does not officially offer reinforced KALLAX shelves, as the system is designed for an average load profile.

2. Many people use wood panels instead (e.g., plywood or MDF, 18-22 mm (0.7-0.9 inches) thick) cut precisely to size. Glue and edge sealing are, of course, also recommended.

3. Steel or aluminum frames underneath or fitted into the compartments can significantly increase load capacity. For example, you can have a flat steel frame made to fit into the openings and place the wood panels on top.

4. If you are handy, you can also add extra reinforcements beneath the regular shelves, such as a central support made from metal profiles or wooden strips.

How heavily do you plan to load the shelves? Do you have exact weight specifications? This will determine how extensive the reinforcement solutions need to be.

Best regards!

BENBI schrieb:
A classic IKEA shelf panel is made of compressed particleboard with a thin melamine coating and typically supports around 10-15 kg per shelf.

That is correct. The dimensions are also important because the deflection increases significantly with greater width.

I also recommend switching to steel shelves if the load is heavier, which are available from some DIY retailers in the appropriate size. Alternatively, more durable wooden shelves made from plywood with a minimum thickness of 18 mm (0.7 inches) will significantly increase load capacity.

The official load capacity of standard KALLAX shelves is up to 13 kg (29 lbs).

Could you provide more details on the weight of the loads in kilograms and the shelf panel dimensions?

There are no original KALLAX shelves designed for very heavy loads. It is best to use your own wooden boards or have metal shelves custom made. If necessary, add central support for reinforcement.

Thanks for the quick responses so far!

For my KALLAX, the shelves measure 77 x 33 cm (width x depth). The main load consists of heavy non-fiction books and toolboxes, roughly 20-25 kg (44-55 lbs) per shelf.

I was aware that IKEA does not offer original shelves for this, but maybe there are third-party options?

Metal shelves sound interesting, but I’m concerned about support and fitting issues.

Custom wood panels from a carpenter would be my alternative, but I’m not sure if everything will still fit properly during installation because of the fixing points.

Are there any experiences on how to install the shelves so that the unit remains dust-tight and stable?

Savas schrieb:
Metal shelves sound interesting, but I’m worried about support and fitting issues.

That’s a valid concern.

I completed a project some time ago involving KALLAX units with heavy loads and can recommend a practical approach:

- First, I carefully measured all interior dimensions. The support strips on the KALLAX are about 12 mm (0.5 inches) wide and approximately 5–6 mm (0.2–0.25 inches) deep (groove recesses).

- Then I had birch plywood panels (18 mm (0.7 inches) thick) cut to size, with the bottom edges slightly beveled to ensure a snug fit.

- For fixing, I used small aluminum angle brackets mounted on the back panel and inside the shelf to prevent shifting.

- It’s important to reinforce the support strips slightly beforehand, for example by loosely placing thin metal strips on top to avoid bending.

- Alternatively, you can build a metal frame around the wooden panel (H profile), which distributes the load across the entire surface and prevents deformation.

- Glued or screwed edge protectors also help protect against moisture.

If you want, I can provide more details on specific materials and suppliers.