The facade is a building's face

The facade protects against many types of weather, keeps rain and heat out, defies storms and influences the indoor climate. External stresses eventually leave their mark, and result in damage. Time to act!

Depending on the type of damage, different measures are necessary. This must also involve correctly recognising the various problems and evaluating them. One fact always applies, however: the facade needs to be thoroughly cleaned before being painted or coated.


Mineral paints age more slowly

The ageing of the facade is influenced by the building's location and the quality of the facade coating or paint.  KEIM mineral paints represent particularly durable facades because their contents are extremely UV stable.

The oldest known and originally-maintained KEIM facade coatings are over 100 years old.




Mineral paints are UV stable. They age due to continuous, even losses of coating layers, which means that the coats get thinner over the decades, and naturally weather away.


Dispersion or silicate-resin binding agents become brittle over the years due to UV light. They develop cracks. Water ingresses and gets behind the coating, causing it to flake.


Chalky coatings are characterised by pigment shedding. A powdery residue is left behind after running a hand across the facade. These loose parts need to be thoroughly removed.

Algae and mould

Micro-organisms need moisture. Facade surfaces which are wet for extended amounts of time are affected by the growth of algae and mould more quickly than dry facades. The best protection against the growth of algae and mould is, for example, a sufficient roof overhang..

If the facade has green, red or black algae and mould growing on it, these must be removed using suitable cleaning agents before the new coating/coat of paint is applied.

Alkaline and fast-drying coatings such as KEIM Soldalit mineral facade paint are particularly suitable as the paint of choice. It offers excellent protection against the growth of algae and mould (and works without the addition of questionable biocides).

→ KEIM AquaROYAL ETIC system provides reliable protection against fouling.



Dirty facades

While dirt is not damage in the classic sense of the word, it is still not desirable. Dirty facades appear unmaintained and ugly. Cleaning the facades with a power-washer is often sufficient. A new coating or coat of paint only needs to be considered if surface damage becomes visible after cleaning. Silicate paints, such as KEIM Soldalit, remain clean for a particularly long period of time because they are not statically charged.


Flaking paint

Flaking is the detaching of small or large pieces of paint or coating from the substrate. These usually occur because the colour binding agent becomes brittle. It is also a relatively common occurrence to find little cracks. Loose coating parts and/or flakes of paint must be removed carefully. Small hairline cracks can be filled with grout over the course of renovation.



Cracks can have a variety of causes and can be evaluated very differently. Small, fine hairline cracks with widths of under 0.2 mm can be filled with a coating and usually do not cause any damage. Larger and wider cracks absolutely need to be assessed by an expert. The cause needs to be determined and the cracked areas correctly repaired. As these could have serious consequences, this is a vital step. Cracks can cause subsequent damage.


Render spalling

Render spalling is the detachment of render from the substrate. The render loses its adhesion. This is often caused by hollow points and cracks in the render, which in connection with water and fluctuating temperatures can cause damage. Damage to the render must be repair by an expert using the same type of material. In the case of just a bit of localised spalling, repair renders such as KEIM Universal Render can be used, otherwise a professional should be consulted.