Painting the façade: facade color and its characteristics

Painting the façade: facade color and its characteristics: paints

Façade paints are mainly used for new and renovation paintings smooth or fine to coarse textured mineral substrates used. It is also possible to use it as a high-quality paint for interior coatings in accordance with the new DIN EN 13300.

Today, facade paints are mainly environmentally friendly, as they contain mainly liquid and hardly any solvents in the liquid phase. In practice, their classification is based solely on their binders. Of their type and quantity depend on the most important application technology Properties of the facade colors from.

Decorative protective function of facade paints

In addition to the decorative function, facade paints have mainly a protective function to take over.

They are constantly exposed to very high levels of exposure to weather conditions such as water, UV rays and air pollution and must therefore be weatherproof (VOB DIN 18363).

Other most important requirements relate to the adhesion to the substrate, water vapor permeability ("breathability"), water absorption, ability of crack bridging and resistance to the growth of microorganisms, in particular of algae and moss.

Facade paint with facade paint

Spring is approaching and with it the time spent in the garden again. In the sunlight you can see the traces left by the winter on the house facade. In order to avoid worse damage, we recommend the home regularly a new coat of paint to miss.

Especially the long cold and wet weather often leaves cracks and exfoliations that look ugly and also threaten to damage the masonry. Smaller parts of the façade can be remodeled by homeowners with a little practice and guidance.

The choice of an unusual hue such as mocha brown also makes the garden and terrace appear in a whole new Mediterranean splendor. Important for the success are the suitable high quality Paints and materials.

Preparation of the facade painting

Painting the façade: facade color and its characteristics: facade

1. Clean the facade

Before the painting All have loose, peeling spots and efflorescence with one Spatula or a wire brush thoroughly scraped and cleaned. Efflorescence is usually the result of permanent wetness.

Therefore, the house wall should be checked for moisture sources and, if possible, should be drained. The damaged areas are then refilled with a sealant based on pure acrylate.

Before painting, the facade is thoroughly cleaned with water and all-purpose cleaner and then cleaned with clean water.

For aged crumbling facades as well as for problems with efflorescence, mold or fungal attack, the surface with a Façade primer based on pure acrylate pretreated. It allows the subsequent coat to adhere better to the substrate and provides protection against efflorescence. It is essential to let primer dry overnight.

Painting the façade: facade color and its characteristics: color

2. Scrub the facade

Apply facade paint twice

For the actual painting is facade paint - also based on pure acrylate - preferably. If you want a special color, it can be easily mixed into more and more hardware stores.

For a perfect result, the color should be applied twice become. The first time the color is with ten percent water diluted to better cover existing seams.

The second coat will be undiluted applied. The color should be in one operation processed without a break so that later no approaches can be seen. Important for a good success are also the Weather conditions:

It should at least ten degrees Celsius warm and dry, but also not too hot his. The facade should go beyond that never in direct sunlight be deleted.

Painting the façade: facade color and its characteristics: painting

3. Paint façade with facade paint

Facade paints: properties and purposes

Properties of façade paint - a broad field that is not always completely overlooked by DIY store employees.

In order to paint a façade in a long-lasting and opaque way, factors such as humidity at the location, Strength and direction of the weather as well as an exact knowledge of the facade plaster necessary.

On this page the different color schemes are presented in detail and summarized in a table. It also addresses the use of older color varieties, which are used, for example, in the listed play a role again today.

Silicate paint / mineral paint

Painting the façade: facade color and its characteristics: color

Silicate paint on town hall in Schwyz (CH) - from 1891

Silicate paint, also called mineral paint, water glass paint or, according to its inventor, seed color, is a paint which is used as Binder potassium waterglass used.

This special manufacturing method gives silicate paints very long shelf life and very good color properties, they are very weather resistant.

Mineral paint was created at the end of the 19th century in Bavaria to enable permanent paintings based on the Italian model.

Inventor of the first commercially available silicate paint was Adolf Wilhelm germ, after him, the color is still today "Keimfarben" called.

Unlike dispersion or glue paints, silicate paint forms an inseparable bond with the mineral substrate, which is referred to as silicification.

For setting is therefore also a silicon-containing substrate Required, most outdoor plasters fulfill this condition.

On wood or plastic silicate paint holds poorly or not at all.

In hardware stores silicate or mineral paint is rather rare to find, as the color alkaline-corrosive acts and must be handled with care and expertise. However, silicate paints can also be obtained from well-versed do-it-yourselfers through wholesalers.

emulsion paint

Painting the façade: facade color and its characteristics: façade

Dispersion in the model

Emulsion paints are based on the chemical principle of dispersion named. This refers to mixtures of two or more substances that can not be combined chemically or hardly with each other, a well-known example being oil and water.

However, by adding various binders and solvents it is possible to produce at least a temporary homogeneity of the liquids - as in the ready-mixed dispersion paint.

Here pigments, solvents and binders enter into a temporarily durable compound, which is intensified by the stirring of the paint.

Come outside Resin emulsion paints according to the standard DIN EN 1062 is used. This defines the typical color properties of a dispersion paint for outdoor use. Advantages of emulsion paints are, in addition to a comparatively low price, especially the good environmental compatibility and the easy processability.

Emulsion paints are non-toxic, not corrosive and fume out only a few pollutants. In dispersion facade paint, however, are not rare Integrated biocides, which are intended to prevent mold and algae infestation of the facade. However, high-quality and modern synthetic resin dispersion facade paints can do without these harmful additives.

acrylic paint

Acrylic paint, also acrylate paint for the facade painting is, in principle, a synthetic resin emulsion paint. For outdoor use are acrylic paints in several quality levels available, which is undoubtedly the best and most expensive "100% -Reinacryl".

However, since one has to be able to afford this, also cheaper acrylic paints with styrene admixtures in different concentrations are offered. Nowadays, acrylic paints are the first choice for a good facade paint, the higher the acrylic content, the better the durability and coverage.

They can also, unlike mineral paints, relatively easily and in one rich color spectrum tinting.

Facade paint with lotus effect

Facade paint with lotus effect sounds like High-tech, not entirely wrongly. Here, a synthetic resin dispersion paint is enriched with nanoparticles, which is an artificial roughening of the paint surface as on the leaves of the lotus plant cause.

The result is one greatly reduced dirt sensitivity the painted surface; Moose, algae and mold have no chance - so at least the advertising.

In practice, the biological cleaning effect is difficult to reproduce. Certainly with lotus effect colors a certain dirt inhibition can be proven, but in the long run this is not:

Lotus colors are fat-sensitive, already fingerprints nullify the effect. In industrial areas or residential areas with a lot of fireplace heating, greasy fumes add color.

Painting the façade: facade color and its characteristics: façade

Lotus effect - graphic illustration

The color properties are therefore not so outstanding that it is absolutely necessary to justify the much higher purchase price.

The adjacent graphic clarifies the functional principle of a lotus surface:

At the top, a hydrophilic surface is shown, from Greek. hydro philos = water-loving, At this nestles water, it is also called a high wetting value.

The second surface is hydrophobic, (Greek: hydrophobos = water-hating, -fearing).

As an example, a freshly waxed car paint can serve, here pearls water or forms drops on the surface.

The superhydrophobic surface At the bottom, the effect of the lotus effect shows: With minimal contact with the surface, the water droplet simply rolls off, it can not adhere.

The lowest wetting ability achieved in this way is the secret of the lotus effect. But as I said: This works especially on the lotus plant and in theory - even the best lotose effect facade paint does not match this perfection.

Difference between "lotus" and "lotus"

A difficult question: is it? "Lotus effect" or "Lotus effect"? Both are in some ways correct, even if the plant named after the phenomenon is called "lotus". Lotus, however, is a car brand, but also the botanical name for horn clover - this, however, has nothing to do with the lotus effect.

What to do? We decided to use the notation "lotus effect" because it is more common. The correct thing would be "lotus effect" - but we are powerless against the power of everyday usage.

Color properties listed in tabular form

Synthetic resin silicone resin paintsilicate paintemulsion paint
Preferred use:Mineral and synthetic resin plaster, brick, natural stone, old paintingsMineral plaster, limestone, (no old resin plasters, old paints and emulsion paints)Mineral and synthetic resin plaster, brick, natural stone, old paintings
Tinting:with spot colors and universal tinting concentrateswith suitable spot colors and universal tinting concentrates on an inorganic basiswith spot colors and universal tinting concentrates
Gloss:different gloss levels possiblematt appearancematt appearance
Handling:lightRisk of chemical burns, as strongly alkalinelight
Verfestigungsart:Formation of an elastic film (crack-bridging effect possible)chemical reaction with the substrateFormation of a microporous film
Water vapor permeability:reducedvery highhigh
Water absorption:lowsensitive to waterWater repellency ("beading effect")
Algae:moderate, with algicide addition lowlowstrongly
Tendency to:sensitive to dirtlow, self-cleaning effect due to weatheringmediocre

Choose the right color

Façade paints have little in common with interior paints: special additives and formulations make them waterproof and ensure a consistently good coat of paint.

To achieve a good weather resistance, various binders can be used. As a rule, these are plastics or mineral binders.

In the following article we will show you which binders are available and which are especially good and durable.

Categories of colors

Organic bound colors

Count to this category especially synthetic resin emulsion paintsconsisting of carbon compounds. They are usually based on acrylate, which may also contain other components such as styrene. Such colors are usually called acrylic, acrylate or styrene acrylate facade paints.

If, on the other hand, the paint contains a dispersion of synthetic resin based solely on a pure acrylate, the name for it will be used 100% pure acrylic used. Such facade paints are in general more flexible, weatherproof and therefore high quality.

By adding additives, the colors can be given special properties. Siloxane-reinforced facade paints, often labeled SIL, have improved water repellency and water vapor permeability. Algizid and fungicidal facade paints provide excellent protection against attack by microorganisms, especially against algae and moss.

Belong to the second group Silicone resin emulsion paintscontaining a silicone resin emulsion and possibly a proportion of resin dispersion as a binder. They act as a bridge between the organic and the mineral binders.

Mineral-bound colors

This group is almost exclusively owned by the silicate paints represents. They contain potassium silicate as a binder, which can be added small amounts of a synthetic resin dispersion for the purpose of improving the properties (dispersion silicate paints according to VOB DIN 18363).

Preparations and processing instructions

Before applying each color is the condition of the underground to investigate exactly. Since the painting work carried out can only be as good as the substrate on which it is carried out, the substrate must above all clean, dust and grease-free and stable his.

Heavily absorbent substrates should definitely be with one suitable primer pretreated. It is always advisable to stay in the same system. Deep ground or plaster base are best suited for surface pretreatment before coating with synthetic resin emulsion paints. Silicone resin base should be used together with silicone resin, Silicate fixative to be used with silicate paints.

Before the election and then before the application, you should thoroughly inform yourself on the basis of the label text - about the product, because facade paints have (besides many similarities) their peculiarities. So is to distinguish between plastic-based and mineral-based colors, and the tinting behavior is not always the same.

Although facade paints are sold ready to use, they must stirred well before use become. They can be rolled, painted and usually sprayed. It often becomes one double coat recommended.

The primer can be up Max. 20% diluted with water. Facade colors should not below + 5° C processed and not below 0° C be stored otherwise they do not form a uniform film or become unusable.

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