ᐅ How can I prevent BILLY shelves from sagging?

Hello everyone, I recently got an IKEA BILLY bookshelf and am using it for my books and some heavier decorative items. However, I’ve noticed that some of the shelves are visibly bending, which worries me because I don’t want the bookshelf to get damaged or the shelves to break over time.

I’m interested in how to effectively prevent the BILLY shelves from bending. What options are there – do I need to support the shelves, use different materials, or follow any special tips? Are there any proven solutions from the community?

It’s important to me that I don’t want to completely rebuild the bookshelf, but rather improve its stability with simple measures. Thanks for your advice and experiences!

ziondu schrieb:
How can I effectively prevent BILLY shelves from bending?

Hey! That’s a common issue with BILLY shelves, don’t worry, you’re not alone :-)

The shelves are made of relatively thin particle board, so bending under load is normal. A very simple trick is to add extra support to the shelves—for example, small metal brackets on the back panel or the sides. It’s easy to install and provides solid stability.

Alternatively, for your next shelf, consider using stronger boards instead of the standard ones—like MDF with an 18mm (0.7 inch) thickness. These are a bit more expensive but definitely make a difference.

One last tip: distribute the weight evenly and avoid placing heavy stacks right at the front of the shelf—that noticeably reduces the risk of bending.

Good luck, and feel free to share what you try! 🙂

Katan schrieb:
A super simple trick is to support the shelves additionally – for example, with small metal brackets on the back wall or the side.

From a technical perspective, this method is practical for increasing load-bearing capacity. Additionally, I recommend not relying solely on the small metal pins of the BILLY shelves to support the shelves. These pins provide only point contact, which leads to localized stress peaks and consequently to sagging.

A thin strip of wood applied evenly under the shelf, spanning the entire depth of the storage surface, can distribute the load more evenly and effectively prevent bending.

Another approach to stiffen the shelves against bending is to install a back panel made of thin plywood, provided the design and intended use allow for it.

In summary: reinforcement directly on the shelf board (reinforced boards/MDF), additional cross strips or brackets, and distributing the load over a larger area are key factors.

ziondu schrieb:
I don’t want to completely rebuild the shelf, but rather use simple methods to improve its stability.

Good morning! I also experienced sagging with my BILLY shelves and managed to significantly reduce the problem using a few straightforward approaches.

First, I want to emphasize the factor of weight: the more you place on a single shelf, the greater the load. If possible, distributing heavier items to the lower shelves often helps a lot.

Next, regarding assembly: you can attach simple wooden slats (for example, 20x20 mm (about 3/4 x 3/4 inches) construction timber) perpendicular underneath the shelves. These act like reinforcement supports and function similarly to a beam.

pikin schrieb:
A back panel made of thin plywood can be installed, if the design allows.

Exactly, the back panel of BILLY shelves is usually made of thin plastic sheet, which contributes little to stability. By integrating a sturdier back panel here, you can also improve the distribution of the load.

The combination of load distribution, additional supports, and slight rearrangement of weight usually works wonders. I personally have had good results using small metal brackets and wooden slats. Good luck with your project!

Support the shelves with metal brackets underneath. Avoid point loads. If necessary, use reinforced boards. Distribute weight evenly.