Good morning everyone, I currently have the problem that the shelves of my IKEA Billy bookcase sag as soon as I place even moderately heavy books on them. Therefore, I am specifically interested in: Which methods actually help to effectively prevent or fix the sagging of the Billy shelves? I am looking for sustainable solutions, ideally without having to completely disassemble the bookcase, and technical or DIY improvements are also welcome. What experiences or tips can you recommend, especially regarding the load-bearing capacity and durability of the shelves? Thanks in advance!
There is also the approach of analyzing sagging with technical methods before blindly adding reinforcements. Has anyone ever worked with a simple measurement to determine how much a floor actually bends under load? This data could help to better evaluate the effectiveness of different reinforcement methods. Personally, I would also attribute the load to a reduction of the span, so I might recommend dividing the shelf into smaller sections. Ultimately, the optimal method depends heavily on the individual case.
enrique7 schrieb:
Measurement of how much a floor actually deflects under load Very good point. Even simple digital spirit levels with an inclinometer app are already helpful here. By comparing 2-3 measurements under load and when unloaded, you can clearly see whether the effort for reinforcement is justified or just a waste.davebla schrieb:
whether the effort for reinforcement is justified or just a waste – that’s the critical point. People want to put in the effort, but the problem is basically self-inflicted because no one paid attention to the material. 16mm (5/8 inch) chipboard is simply too weak; improvising won’t help much unless you enjoy tinkering.Regardless of the material quality, I strongly recommend paying attention to the fastening points and screws when installing reinforcements. Low-quality screws can also fail under higher tensile or compressive loads. Screws with a minimum diameter of 3.5 mm (about 0.14 inches) are suitable here, ideally with a countersunk head to avoid damaging the surface. Additionally, the embedment depth into the shelf side panel should be carefully checked to ensure the screws hold firmly and do not “float” in the material. This is the only way to achieve a stable structure that will support loads reliably over time.
sarla schrieb:
pay attention to the attachment points and screws Exactly, and to add to that: It is worthwhile to apply wood glue to the relevant areas before installing metal or wood reinforcements. The adhesive distributes the load more evenly and provides a more stable load-bearing capacity. Additionally, consider supporting a crosswise beam not only in the middle but also on both sides with small wooden blocks that fit under the shelves. Small details like these often make the difference between a temporary and a permanent solution.Similar topics