ᐅ BILLY Shelf Boards Sagging – Increasing Load Capacity

Hello everyone, I have the common problem that the shelves of my Billy bookcase bend under the weight of the books. The wood has already started to sag a bit, which doesn’t make it any more stable. I want to increase the load-bearing capacity of the shelves to prevent further sagging. Does anyone have experience with how to reinforce the shelves or if there might be alternatives without having to buy completely new shelves? I’m open to any ideas, whether reinforcements, supports, or other methods. Thanks!

It is best to screw metal brackets under the floors to absorb the stress. This saves a lot of trouble.

The sagging of the BILLY shelf is usually caused by the relatively thin particleboard of the shelves and the long span. A simple solution is to insert support strips or reinforcement profiles made of aluminum on the underside. It is better to use several small reinforcements distributed along the length. Alternatively, a glass or plexiglass sheet can be placed on top if the appearance is acceptable.

“Does anyone have experience with how to reinforce floors or if there might be any alternatives…” – why not simply switch to solid wood shelves made by a carpenter? BILLY is cheap furniture anyway, and constantly repairing or reinforcing it sounds like an unsustainable solution to me.

NOAHSAU schrieb:
„...why not just switch to wooden shelves made by a carpenter? BILLY is cheap anyway...“

That’s a reasonable idea, but the cost-benefit factor is important. A custom carpenter-made shelf can quickly cost several hundred euros, and often a simple reinforcement is entirely sufficient. So before buying new shelves, you should first clearly determine the load limits and then reinforce accordingly.

For the technical assessment: According to the manufacturer, the BILLY shelf has a load capacity of approximately 30 kg (66 lbs) evenly distributed. Exceeding this causes the shelf to bend. A practical workaround is to install thin metal profiles or wooden beams on the underside of the shelf to significantly reduce sagging. It is important to fasten the reinforcements at multiple points to ensure even load distribution and avoid localized pressure.