ᐅ Which Billy models are particularly suitable for heavy books?

Hello everyone,

I am facing the challenge of equipping an Ikea Billy bookcase to hold a large collection of particularly heavy books. My specific question is: which Billy models or versions are best suited to securely support heavy books without the shelves sagging or getting damaged? I am interested in both the standard models and any modified versions with reinforced shelves or special construction. Are there recommendations regarding material thickness, the number of shelves, or additional reinforcements to consider when purchasing or retrofitting?

I look forward to well-informed answers and practical experiences to find a long-lasting, stable solution.

I have had good experience with the Billy shelves that are 40cm (16 inches) deep for heavy books. The wider shelves provide more stability. Additionally, I would pay attention to the shelf spacing: more shelves with smaller gaps are better to minimize sagging.

You can increase reinforcement by attaching wooden battens under the shelves, which significantly improves load-bearing capacity.

nubar schrieb:
You can increase strength by attaching additional wooden strips under the shelves, which significantly improves their load capacity.

This is a very important point. I would like to expand on the explanation: The standard Billy shelves are made of particleboard, about 16 mm (5/8 inches) thick, which is sufficient for light to medium-weight books. For heavy books, caution is advised starting at around 15 kg (33 lbs) per shelf—the risk of sagging increases considerably.

To create a more durable solution, I recommend the following steps:
1. Choose the Billy models with a 40 cm (16 inches) depth, as they provide a larger support surface.
2. Retrofit with wooden strips, preferably U-shaped, screwed underneath the shelves. These strips should be firmly connected to the side panels to ensure proper load distribution.
3. Alternatively or additionally, metal brackets can be used as support, especially at the back panel, to prevent twisting.

It is also important to ensure that the side panels themselves do not deform—attaching back panels with additional reinforcement offers extra protection against sagging.

How many heavy books do you plan to place per shelf? This helps to better assess the load.

Gafiel schrieb:
How many heavy books are you planning per shelf?

Good question! For each shelf, I plan around 12 to 15 books, each generally weighing between 1.5 to 3 kg (3.3 to 6.6 lbs). These are often thick volumes and reference books, some of which weigh well over 2.5 kg (5.5 lbs).

I would estimate the total load per shelf to be at least 25 to 30 kg (55 to 66 lbs). That already sounds like a considerable load, and I assume standard shelves would definitely have issues with this.

Regarding the profiles: Could you or someone else give a specific recommendation on which wooden strips should be used? My concern is choosing something that’s difficult to install or that might eventually give way. Is solid wood better, or should I go for plywood? Thanks in advance!

Lekla schrieb:
Regarding the profiles: Could you or someone else specifically recommend which wooden strips should be used?

When choosing reinforcements, I highly recommend solid wood strips with a minimum width of 20 mm (0.8 inches) and thickness of 15 mm (0.6 inches). Beech or pine are practical options because they are sturdy and easy to work with. These should be attached with wood screws directly under the shelves to the side walls and ideally mounted in the middle as well.

Plywood is also stable, but the edges are more prone to wear when screwing in. Solid wood has the advantage of showing less warping over time.

Here is a step-by-step suggestion for the reinforcement:

1. Measure the exact length of the shelves.
2. Cut the wooden strips to the appropriate length.
3. Pre-drill holes in the strips and in the underside of the shelf to prevent splitting.
4. Attach the strips with at least 3–4 screws per strip, tightened firmly but not overly tight to allow for wood movement.
5. If possible, also mount a strip lengthwise in the center under the shelf if the span is large.

Optionally, for even more stability, metal brackets can be precisely mounted under the corners. It is important that the back panel is firmly secured to prevent lateral twisting.

If you want, I can also recommend suitable screws and drill bits.

I hope this helps you with your planning.