ᐅ My cat tree made from a KALLAX shelf is no longer stable – any tips?

Hello everyone,

My cat tree, which I built from a KALLAX shelf from IKEA, unfortunately isn’t as sturdy as it used to be. The structure was originally quite stable, but after about a year, everything wobbles significantly, especially the top platform that serves as a resting area for my two cats.

I have reinforced the shelf several times with screws and brackets, but the materials and connections probably aren’t optimal here. The load from the cats’ weight plus their jumping seems to be too much for the simple wooden board.

My goal is to improve the stability without completely rebuilding it. Maybe someone knows special types of joints, additional reinforcements, or materials that work well with KALLAX? Tips on screws or assembly methods would also be great, especially if you have experience with similar modifications.

Thanks in advance!

Hello Norex,

a common solution for using KALLAX as a cat tree is to add more weight at the bottom, for example with weights or additional wood. Tighten all the connections, as the screws often loosen. You can use extra plywood for the resting area to increase stability.

Hello Norex,

eldubi schrieb:
You can use additional plywood for the lying surface

That’s a good tip, but I’d like to add a bit more detail in case it helps you:

1. Reinforcing the lying surface: Use a high-quality multiplex plywood sheet at least 18 mm (3/4 inch) thick, cut precisely to your KALLAX dimensions. It should be attached on the back and sides with angle brackets to prevent sagging.

2. Rethink connection points: IKEA’s original connectors are usually designed for lighter loads. Use additional metal brackets in the inner corners and reinforce screws with larger washers.

3. Distribute the load: Spreading the weight more evenly helps avoid point loads. Adding a horizontal crossbeam inside can significantly improve stability.

4. Screw quality: Use steel screws with full threading and, if necessary, also wood glue on the joints.

I recommend carefully applying these steps before considering buying a complete replacement. Good luck!

Thanks already for the tips!

LAURE-TA schrieb:
Use a high-quality multiplex board at least 18mm (0.7 inches) thick if possible

– that sounds like a good idea. The current support surface is just a thin chipboard, which explains some of the bends and dents.

eldubi schrieb:
Tighten all connections, screws often loosen

– I’ve already tried that, but I think it’s true that the screws and the dimensions are the problem here.

Would it definitely be advisable to install metal brackets, or are there better alternatives?

How easy are such reinforcements for DIY beginners to install? I only have occasional experience with a drill and screwdriver.

Hello Norex,

a few additional tips:

Metal brackets are usually the best choice for a quick and sturdy reinforcement. They are easy to screw in and provide good support at corners and edges. I recommend targeted reinforcements at the points where you expect the highest load—probably the top resting surface and the connection points to the side panels.

If you prefer a visually slimmer solution, wooden L-shaped battens can also be mounted on the inside, although this requires more effort and greater craftsmanship for stability.

Besides that, make sure the shelf is completely level—uneven installation increases movement.

KALLAX is a great system, but for such high loads, some suggest installing special cat tree elements additionally. Other than that, rubber feet can prevent slipping.

Your idea of using a stronger board is definitely effective.

Norex schrieb:
Would it be a good idea to always install metal brackets, or are there better alternatives?

Metal brackets are definitely the way to go in this case! 🙂 They basically give your KALLAX a superhero boost.

If you like, you can add some self-adhesive felt pads underneath. These prevent the shelf from sliding around on smooth floors during cat play – less wobbling, more fun.

And don’t worry, installing a few brackets is totally doable, even if you don’t handle tools often. Just a screwdriver, some pressure – done.

Good luck with your project! Your cats will thank you! 😉 🐾