What is different about ceiling color

Damp room paint

Damp room paint - special paints for damp rooms, kitchens and bathrooms

Water stains on the walls and ceiling in the bathroom, sauce stains in the kitchen, traces of cooking fumes and old grease on the wall: this not only looks unsightly, but can also encourage the growth of mold. Special damp room colors and special colors for the bathroom and kitchen promise a remedy. They make the wall easier to clean and should also act as a preventative against mold.

What are damp room colors?

A damp room paint is a wall paint that is particularly suitable for bathrooms, kitchens and other damp rooms because of its properties. However, it must be made clear that even the best damp room paint is not a solution for leaky and permanently damp walls. If the wall becomes damp from the outside, for example due to damage to the facade and insulation that allows groundwater or rainwater to penetrate, or a lack of drainage, the wall must first be drained and renovated before it can be freshly painted from the inside.

Why are damp room paints recommended for bathrooms and kitchens?

Normal wall paints, which you can find in every hardware store for 10-20 euros per 10 liter bucket, offer little protection against dirt and mold. Over time, water vapor, fat vapor and various vapors from the bathroom and kitchen can penetrate deeper and deeper into the paint and the wall. Because the standard emulsion paints have a comparatively low pH value (most are almost pH-neutral), they generally offer good growth conditions for fungi. If a lot of moisture and organic nutrients are added, molds find an excellent breeding ground. For example, in an old bathroom and kitchen paint that, in addition to its organic components, was able to absorb many nutrients (e.g. fat and proteins) from the air and keeps getting nice and moist.

When is a room a damp room?

Damp rooms are usually defined as rooms in which the humidity is very often higher than 70%. This applies e.g. B. Appropriate for most small bathrooms that are shared by more than one person. In the case of bathrooms without windows, there is also the lack of ventilation options to the outside; Ventilation grilles and shafts are not a full replacement for a window. But even in large bathrooms with windows, the risk of mold is higher than in other rooms due to the high volume of water vapor and condensation during the humidity peaks.

In kitchens, the problem is usually less the humidity and the development of steam than the soiling of the walls. Even in a well-ventilated kitchen with a window and an extractor hood, it cannot be avoided that the cooking and roasting fumes leave a greasy film on the walls and ceiling over time. There are also sauce stains, splashes of dirty washing-up water and other traces of normal kitchen operations.

Damp room paints for the kitchen and bathroom must therefore offer two things: high abrasion resistance and water resistance, so that the walls can be washed off and thoroughly cleaned with a damp sponge and soapy water if necessary; also good resistance to mold.

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How do damp room paints protect against mold?

Damp room paints should not be confused with the so-called anti-mold paints, which are often offered in hardware stores as kitchen paint, bathroom paint, damp room paint or basement paint. An anti-mold paint should help against mold or prevent mold infestation due to the added biocides or fungicides (chemicals that kill fungi). In addition, according to the advertising promise, the high pH value, i.e. the alkalinity, should increase the breathability of the anti-mold paint and thus prevent fungal growth.

Such statements must always be questioned critically. Because the alkalinity of the paint coating decreases over time, so that the associated protective effect gradually disappears. The added chemicals are even more questionable. Because they are dangerous not only for mold, but also for people.

The wall paint continues to release fungicides or biocides after drying to prevent mold from settling on the paint. These vapors, which are harmful to the environment and hazardous to health, naturally find their way into the room air. In humans, they can cause skin problems, respiratory diseases and allergies, among other things, or exacerbate existing symptoms. Seen in this light, it is lucky that this anti-mold effect also wears off over time; on the other hand, it makes it clear that the concept of “poison paint” does much more harm than good overall.

Lime paints and silicate paints for damp rooms

Good, natural damp room paints contain no fungicides and are based on mineral binders and dyes. An example of such a natural protective paint is lime paint. Pure lime paints are open to diffusion ("breathable") and with a pH value above 10 they are also strongly alkaline. The high pH value and the water vapor permeability of the damp room paint lead to better air circulation; In times of high humidity, the paint can absorb a lot of water from the room air and release it again later. This means less condensation on the walls, less waterlogging and thus a significantly lower risk of mold growth.

Lime paints are healthy coatings that are also suitable for allergy sufferers and sensitive people. Lime coatings are often used in ecological building, renovation and renovation to regulate room humidity and create a healthy indoor climate. In the case of paints in damp rooms, it is also important to have a good balance between diffusion openness and abrasion resistance. A disadvantage of the pure lime paint is that it is not optimally abrasion-resistant, but "chalked". So every time you work on a lime paint with the sponge or brush, a little paint comes off. In order to increase the abrasion resistance of the lime paint, it must be kept moist for at least one day (24 hours) after painting, e.g. by spraying. In addition, several orders should always be made, which makes processing relatively complex.

In addition to the mineral binder (lime), dispersion lime paints (or lime dispersion paints) also contain an organic plastic binder, namely the dispersion. This is a mixture of water and very fine and evenly distributed plastic or synthetic resin particles. This dispersion portion makes the paint easier to work with (like standard wall paints) and adheres better to the surface. This also increases the abrasion resistance; the paint does not chalk and is easier to clean and keep clean. However, a washable damp room paint with a high proportion of dispersion is no longer as breathable as a pure mineral paint.

Silicate paints are also pure mineral paints; unlike lime paints, however, they are abrasion-resistant after drying. As they are very caustic when they are moist due to their high alkalinity, they may only be processed with suitable protective clothing and protective measures (respiratory protection). There are also versions of the silicate paints with a dispersion component, which you can recognize immediately by the fact that they are offered ready to use. Pure silicate or potassium silicate paints, on the other hand, always consist of two components that have to be stirred together before painting.

Correct processing of the damp room paint

It is important not to paint the damp room paint on the wallpaper or the old paint, but rather directly on the wall, i.e. on the plaster or the masonry. Simply painting over the wallpaper (which may have already been painted several times) would not be a solution to the problem, but a pure waste of material and working time. Not only would the wallpaper material (e.g. paper) cancel the protective effect of the paint for the most part, there is also the risk that the good damp-proof paint cannot adhere properly to the surface.

Silicate paints need mineral substrates such as stone, concrete, lime or cement plaster, with which they chemically bond permanently when they dry; they just don't get along with plaster of paris. You can paint over mineral plasters and organic clay plaster with lime paints; In the case of gypsum plasters, you should apply an appropriate mineral plaster primer beforehand. These damp room paints are not intended for painting over wallpaper or dispersion paints. In order to properly prepare the wall in the kitchen or bathroom for the damp room paint of your choice, you must remove the old wallpaper and, if necessary, free the surface of paste residues, dirt and grease with soap and water. You can repair small damaged areas with a filler that matches the type of paint you are considering and allow it to dry thoroughly before applying the damp-proof paint.

Special features of the kitchen color

While the damp room paint in the bathroom is primarily intended to protect against mold, kitchen paints must be particularly easy to wash off. In particularly heavily used areas, e.g. For example, above the sink or stove, the paint should ideally be able to be scrubbed off properly with soapy water without loosening. You should therefore ensure that kitchen paints are highly abrasion-resistant. Colors of class 1 and class 2 have the highest abrasion resistance and thus cleanability - the EN standard 13300 applies here for interior coatings, and DIN EN 1062 for exterior areas. The information can be found on the container.

In addition to the silicate paints and mineral color dispersions already described, washable and abrasion-resistant acrylate latex paints are also suitable as damp-proof paints for kitchens. These are modern “variants of traditional latex paints, which, in addition to very good wet abrasion resistance, also have a fungicidal and antibacterial effect. In order to renovate as healthy and tolerable as possible, pay attention to the "Blue Angel"; Low-polluting paints and varnishes are marked with the environmental seal of the German Federal Environment Agency.

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