ᐅ How can I protect Ikea PLATSA from moisture?

Hello everyone,

I have a question regarding the protection of my Ikea Platsa system from moisture. I plan to place the furniture in a room that occasionally becomes a bit more humid—especially near a window that slightly condenses in winter and sometimes lets in moisture when ventilated in summer.

Since PLATSA is made of wood particleboard with a melamine coating, I’m concerned that moisture could damage or cause the material to swell over time. Are there proven methods to effectively protect the furniture from this kind of moisture?

I’m particularly interested in practical but also long-term solutions. Examples or tips on surface sealing, additional seals, suitable indoor climate measures, or other protective precautions would be very helpful.

I look forward to your experiences and assessments. Thanks in advance!

Hello Ken-ni,

First of all, it’s great that you’re thinking about this! 😄 With PLATSA – or really any IKEA furniture made from particleboard – moisture is the natural enemy. It can be especially tricky near windows.

Here are my recommendations:
- Air circulation reduces trapped heat and moisture. So, don’t place the furniture flush against the wall; leave a few centimeters (inches) of space.
- You can stick felt pads or plastic bumpers to the bottom underside of the furniture to prevent it from sitting directly on the floor, in case the floor gets damp.
- If you want to protect the surface, there are wax-based sealers or special furniture waxes you can carefully apply to the external edges.
- And very importantly – ventilate regularly and, if possible, place a small dehumidifier in the room.

I did the same with my PLATSA and have been very happy so far. Easy and it really works wonders. 😎

[@Ken-ni] Your concern is very valid, as furniture panels like those used in PLATSA, which are mainly made of MDF or particleboard with a melamine coating, can be significantly affected by moisture. The cellulose absorbs water and swells, and despite the coating, moisture can penetrate the surface layer, especially at edges that are often only laminated.

For long-lasting protection, I recommend a combination of several measures:

- Sealing the edges: Lamination alone is often not enough. You can apply a clear acrylic or polyurethane edge sealer that is waterproof and repairs cracking areas.
- Using silicone or acrylic sealants on all joints against walls or windows to prevent the ingress of condensation water.
- Using rubber or foam pads on the underside to keep the furniture off the floor, avoiding direct contact with any potential moisture.
- Monitoring the indoor climate: Ideally, maintain a relative humidity around 50% and a temperature around 20°C (68°F).

Please note: Sealing changes the appearance very little but significantly increases durability. Also, regularly check whether the seals are still intact.

Could you briefly describe how humid your room actually is and whether the moisture is temporary or permanent? That would help to better assess the appropriate measures.

Thanks in advance for the helpful tips!

[@valerie-tr] Regarding your question: The humidity in the room is not permanently high; it’s more of a seasonal issue—especially during the cold season when the inside surfaces of the windows fog up. Ventilation is done regularly, but sometimes not perfectly due to weather conditions. The rest of the time, the indoor climate is relatively stable and normal.

The piece of furniture is placed about 30 cm (12 inches) away from the window, not directly against the wall, and there is a baseboard, but no special spacers or the like on the floor yet.

The idea of using edge lacquer sounds interesting; I hadn’t considered that before.

I’m wondering how much effort applying the lacquer actually requires and what needs to be taken into account. Would a standard clear lacquer from a hardware store be sufficient, or should I use special furniture edge lacquers?

valerie-tr schrieb:
A sealant hardly changes the appearance but provides significant durability.

Hello Ken-ni,

I can only agree with valerie-tr. Using a special PU edge lacquer is very effective and especially worthwhile for furniture like PLATSA, which is often only covered with melamine foil.

Regarding application: You don’t need much experience; it works best with a small brush or foam applicator. It is important to thoroughly clean the edges beforehand and lightly sand them, for example with fine sandpaper (grit 240). Then apply the lacquer thinly and evenly, preferably in several layers. It takes a few hours to fully dry, and patience is required during this time to avoid uneven layers.

Standard clear lacquers from hardware stores, usually water-based, often do not meet the requirements. Special PU or edge lacquers for furniture are better; they are waterproof and flexible enough to accommodate any movement of the wood fibers.

It is crucial that the edges are completely sealed and not only treated spotwise; otherwise, moisture can penetrate exposed areas and cause damage.

If you want, I can also explain how to seal the joints between wall and window. That also contributes significantly to preventing moisture from entering from outside.

I would like to consider a few points in more detail:

Louie schrieb:
Standard water-based clear coats from hardware stores often do not meet the requirements.

That is true; however, I cannot fully rely on the assumption that every layer of polyurethane varnish automatically provides better protection. Adhesion and durability strongly depend on the specific product and how clean and well-prepared the surface is.

Additionally:
- It is often recommended not to place furniture directly against windows or exterior walls, as even the best sealants may eventually face issues in these areas.
- Whether a dehumidifier can effectively capture small amounts of moisture depends on the air circulation and the size of the room.

It is worthwhile to measure the room carefully (e.g., with a hygrometer) and then assess how effective the measures need to be.

If the PLATSA units are installed in kitchens or bathrooms, the risk is higher, and it may even be worthwhile to place a moisture barrier film under the furniture or install other protective barriers.