Facade paint is the final coating in the thermal insulation system, or on traditional renders applied on external walls. Therefore it must be of good quality, as it is the most exposed to harsh weather conditions -- rain, sun and frost. Facade paint should also have good adhesion to the surface
Types of Facade Paint
- Acrylic paint,
- Silicone paint,
- Silicate paint
They can be considered as the basic paints because of their low price and the popularity, usually they are the first choice paints. Acrylic paints are available in various colours and form an elastic coating, are resistant to rainwater and has an average resistance to contamination. They can be washed easily, including a pressure washer. On high sections of walls washing of difficult-to-reach, therefore in areas where high air pollution occur, it’s better to choose a different paint.
Acrylic paint are susceptible to algae development in areas which are constantly shadowed -- a house is located among trees. Additives can reduce this phenomenon significantly, but full resistance will be achieved from silicate products. Another limitation of acrylic paints is their relatively low vapour permeability, hence they are not suitable for insulation with mineral wool. It is possible to apply acrylic paint on old acrylic renders.
Silicate paints are more expensive than acrylic paints and usually available in fewer colours. They are resistant to contamination, in particular algae development. Silicate painted surfaces form unfavourable and strongly alkaline substrate, so will be a good choice in areas with lot of trees. Silicate painted surfaces has good vapour permeability, but lower resistance to water/rain impact - wet stains on the facade would dry very easily, without damaging the surface. The silicate paints should be applied in dry times and when the surface not under strong sunlight.
Silicone paints are relatively expensive, but they have a unique resistance to water and contamination. Rain can wash the painted surface from contamination. Silicone paints are hydrophobic, pearl water drops would appear, instead of flowing streaks. This paint can be applied to any type of insulation and render, because of their good vapour permeability and water resistance. The paints containing a mixture of resins, e.g. silicone-silicate, are a bit less expensive, but work very well and their features are very alike as silicone paints.