ᐅ Kallax Shelving and Uneven Walls – How to Compensate?

Hello everyone,

I am facing the issue of installing a Kallax shelf unit on a wall that is unfortunately quite uneven. You can clearly notice this because the shelf wobbles in some spots or does not sit flush against the wall without some kind of compensation. My question is: What are the best ways to neatly and permanently level out such wall irregularities so that the shelf stands stable and straight? I am interested in both mechanical solutions like shims or spacer pads, as well as possible adhesive or filler techniques that can be usefully applied.

I want to avoid having to make readjustments after a short time or having the appearance suffer. If anyone has experience, tips, or even step-by-step guides on how to best proceed with Kallax shelves, I would be very grateful. Ideally, I’m looking for a method that is easy for non-professionals to carry out.

Thank you in advance!

I would recommend using small plastic wedges. You can place them under the corners until the shelf is level. Stable and quick.

Hello harmko,

First of all, your concern is completely justified, especially with furniture like Kallax that is relatively lightweight and narrow, where wall irregularities can quickly cause issues.

Basically, you have two options:

1. Mechanical Adjustment: This usually involves using wedges or spacers to align the furniture piece properly. You should use materials that won’t cause pressure marks or deform over time. Plastic wedges or MDF shims are ideal for this. It is also important to secure the wedges with a strong construction adhesive (e.g., polyurethane-based mounting adhesive), otherwise you will need to check them constantly later.

2. Wall Leveling: If you want to permanently level the wall itself, surface fillers are a good solution. A thin-layer chipboard filler or renovation plaster can even out irregularities up to 2 cm (0.8 inches). Keep in mind that this must be done carefully and evenly, and the filler takes time to dry and cure.

One intermediate solution I often recommend: place the Kallax roughly in the desired position and mark the spots where there is no contact. Then use self-adhesive felt pads or small foam cushions (like those used under furniture) to compensate for minor unevenness and protect the floor.

Question: How large are the uneven areas? Small gaps can be compensated with pads. If it is more than 5 mm (0.2 inches), it will be difficult to achieve stability without adjusting the wall or floor.

Remember, the Kallax basically hangs on or stands against the wall. Will it have swing doors or drawers that could also get stuck due to imbalance?

I’d appreciate it if you could briefly describe the wall surface so I can assist you more specifically.

FABIAN_DEO schrieb:
Question: How severe are the unevenness? Small gaps can be compensated with shims. If it’s more than 5 mm (0.2 inches), it will be difficult to keep it stable without adjusting the wall or floor.

Thank you for the detailed response! I would estimate the unevenness at around 3–6 mm (0.1–0.2 inches), depending on the area. It’s an old wall with original plaster, showing visible dents and slight inclines, especially in the lower third of the wall. The Kallax unit will sit directly on the floor and will, of course, be securely fixed to the wall.

FABIAN_DEO schrieb:
Keep in mind that the Kallax is basically either wall-mounted or standing? Will it have swinging doors or drawers that might block due to imbalance?

They are regular compartments, no doors. I don’t use drawers. But I still want to avoid the shelf wobbling or standing unevenly later on, as that would also be visually distracting.

Maybe it would be an option to use small wooden shims or washers at critical points. What do you think about that?

Hello harmko,

I would like to provide a somewhat structured guide to help you safely and evenly position the Kallax against an uneven wall:

1. Assess the wall and floor:
- Use a spirit level or a long straightedge to measure the unevenness of the wall and floor.
- Mark the areas with the most significant deviations.

2. Prepare shimming materials:
- For unevenness of 3–6 mm (0.1–0.25 inches), I recommend thin wood shims, MDF strips, or plastic wedges.
- These should be precisely cut to compensate for specific gaps.

3. Trial installation:
- Place the Kallax temporarily against the wall and put the shims under the affected areas.
- Check with the spirit level to see if the unit now stands flat.

4. Securing the shims:
- Once stability is confirmed, you can fix the wedges or shims in place using construction adhesive or silicone.
- Be careful not to cause deformation by gluing too tightly.

5. Wall attachment:
- Use appropriate wall brackets or angle braces to secure the unit and prevent tipping.
- This is especially important in older buildings where floor unevenness is common.

6. Visual adjustments:
- Optionally, you can add shadow gaps or cover strips along the wall to conceal minor irregularities.

Common mistakes I’ve noticed:
- Using wedges that are too thick, causing pressure and deformation of the furniture.
- Using insufficiently stable materials that compress over time.
- Fixing the shims without precise alignment first, leading to a crooked setup.

Conclusion:
With careful preparation and material selection, you can reliably compensate for wall and floor unevenness. Accurate measuring is key. If you like, I can also provide a list of recommended materials and suppliers.

Good luck!

Wedges or small wooden shims that are placed and glued under the legs work well for minor unevenness. Self-adhesive felt pads also often help.