ᐅ Are the Kallax shelves strong enough to hold books?

Jenssi schrieb:
You’re using the shelf in the living room, so the load is continuous, and often the books need to be taken out, meaning the shelf is regularly used.

With such a permanent and regular load of about 12–14 kg per compartment, I would recommend avoiding heavily uneven loads. Although the Kallax shelves are solidly built, wooden boards like MDF can fatigue over time.

Jenssi schrieb:
Do you think reinforcing the shelves would be useful, or can the Kallax system handle the weight over long periods without noticeable damage?

In theory, the shelf should be able to support the weight long-term as long as the load is evenly distributed and the shelf is not continuously overloaded at specific points. The shelves themselves are not reinforced, so slight sagging under constant load is unavoidable but usually not critical if not excessive.

If you want to be on the safe side, you can better distribute the load and extend the lifespan by placing an additional MDF or thin plywood panel across several shelves. Adding more shelves is also an option.

How long exactly are your shelves? The standard Kallax depth is just under 40 cm (16 inches). The shorter the span, the higher the load capacity.

bapar schrieb:
The shelves themselves are not reinforced, so slight bending under continuous load is unavoidable, but usually not a problem unless it’s excessive.

I can confirm this! I have my Kallax shelves fully loaded with books as well. There is a slight bowing visible, but honestly, it’s only noticeable if you look closely :-). For everyday use, it’s really not an issue.

I also make a point of only filling some shelves halfway – this way, I consciously distribute the weight. A #lifehack that helps when nobody wants the shelf to turn into a diving board ;-)

So: no need to worry. The Kallax can take quite a bit of load 🚀.

Trate47 schrieb:
A slight amount of sagging is visible in my case as well, but honestly, it’s only noticeable if you look very closely :-).

This is often overlooked in practice: a slight bow does not necessarily indicate a risk. MDF material also expands and contracts slightly, meaning it deforms minimally over time, but this does not affect its functionality.

It is important to know the weight per shelf and try not to significantly exceed it, to avoid compromising the unit due to uneven loads.

If you really have very heavy items or very large books, adding an external wooden board for the shelf base or a second level with two shelves may be advisable.

Otherwise, Kallax is more than adequate and sturdy enough for regular book use in a living room.