ᐅ KALLAX and loose back panel – what is the most secure way to fix it?

Created on: 17 Jun 2022 09:12
K
keo_ken
Hello everyone,

I’m facing the issue of how to securely and permanently fix the loose back panel of my IKEA KALLAX shelf unit. On my KALLAX (the 4x4 model), the back panel is coming loose in several places, especially on the lower compartments, which causes the whole unit to lose stability. The original thin nails simply don’t seem sufficient anymore—mainly because the back panel is made of thin MDF and the stability of the entire unit depends on it.

My question to the community: What methods do you recommend for additionally securing the back panel to improve stability? Has anyone had experience with screws and brackets, glue, double-sided tape, or maybe even adding an extra wood panel for reinforcement? Are there any specific tricks that make the installation easier without damaging the material?

Background: I don’t want a complicated or irreversible modification because I might want to repurpose the shelf in the future. But it should be properly secure and load-bearing, especially since I store books in it.

Thanks for your advice!
J
Jonas66
17 Jun 2022 14:35
I simply screwed small screws into the side frames of my KALLAX and clamped the back panel to the frame with screw clamps. The back panel is secured at two or three points. This is completely sufficient.

No brackets or glue needed. Very simple and reversible.
R
Roberta
17 Jun 2022 15:40
Alternatively, try using heavy-duty double-sided mounting tape. With this, you can firmly attach the back panel without drilling.

It holds well, is clean, and can be removed if necessary.
A
Alberto51
17 Jun 2022 16:50
Roberta schrieb:
Alternatively, try heavy-duty double-sided mounting tape. You can use it to firmly attach the back panel without drilling.

That sounds great for people who don't want to use screws. However, I'm not sure if the adhesive strength will hold up over time, especially under the weight of books.

Does anyone have long-term experience with this? I know mounting tape from automotive applications, but not for shelves.
F
floga
18 Jun 2022 08:12
Good morning everyone,

I understand how frustrating it can be when the back panel is loose. I used a combination of adhesive and brackets for mine. The brackets work well, and the wood glue helps to firmly attach the MDF board to the frame.

I combined both, but worked carefully since you can quickly tell if you've applied too much glue and the material swells.

In addition, I didn’t tighten the screws on the brackets too much to allow the back panel some room for minimal settling.

I can recommend this approach if you’re willing to give it a try.
K
keo_ken
18 Jun 2022 09:24
floga schrieb:
Do not tighten the angle brackets too much to allow for minimal settling.

Thanks, that’s valuable information. I was planning to screw them in carefully anyway to avoid any damage.

What size should the angle brackets ideally be? Do you have any experience with dimensions that are not too prominent but still provide sufficient support?
G
gadalu
18 Jun 2022 10:15
The size of the brackets depends on the shelving unit, but for Kallax, I recommend brackets with a side length of around 4-5 cm (1.5-2 inches). They are large enough to create sturdy screw connections but small enough to be placed discreetly on the inside.

It is important to use brackets with at least 2-3 screws per side and high-quality screws, with pre-drilling afterwards to prevent splitting the MDF.

When choosing the material, you should use stainless steel or galvanized brackets to prevent rust.