Choosing Between Acrylic and Silicone Render

The facade is the calling card of any building, but its appearance and aesthetics are not the only considerations. It’s worth selecting a plaster whose properties will best protect the walls of your home. The type of plaster you choose plays a crucial role. While acrylic and silicone plasters share many common features, their differences determine the conditions under which they should be used. So, which plaster should you choose to fulfill its purpose?

What to Consider When Choosing Plaster

Each plaster type has specific properties that, depending on the building, its location, and the materials previously used, can be an advantage or a disadvantage. Understanding these properties is essential to make the right decision, as the plaster you choose will significantly affect the building’s maintenance over time. It’s also critical to adhere to the application conditions recommended by the manufacturer.

Differences Between Acrylic and Silicone Plaster

Vapor Permeability

This property, also known as diffusion resistance, varies between the two types of plaster. Acrylic plaster forms a barrier to water vapor, meaning it cannot be applied to fresh or damp walls. Additionally, combining acrylic plaster with mineral wool insulation is a poor choice, as this combination can lead to wall dampness and detachment of the facade’s outer layer.

In contrast, silicone plaster is highly vapor-permeable and suitable for insulation using both mineral wool and polystyrene. Its microporous structure facilitates the transport of water vapor and gases, making it a “breathable” plaster.

Resistance to Damage and Dirt

Acrylic plaster is highly resistant to mechanical damage. Its elasticity makes it ideal for buildings near busy roads, where vibrations often cause cracks. It is also frequently used for schools or buildings near areas where children play sports.

Both types of plaster contain specific polymer blends that reduce the adhesion of dust and dirt. However, silicone plaster has a self-cleaning ability. Its hydrophobic nature prevents dirt from sticking to the facade, allowing it to be washed away by rain or pressure washers.

Resistance to Mold and Algae

Both types of plaster contain encapsulated biocides, which protect them from microbial contamination. However, silicone plaster is far more resistant to algae growth than acrylic plaster. After several years, the latter may develop discoloration in shades of green, blue, or black.

Application Recommendations

Both types of plaster can be used for new buildings and renovations of older ones, but their applications differ slightly. Acrylic plaster is best suited for buildings in areas with low or moderate pollution, such as suburban areas. It should not be used for renovating walls with existing moisture due to its low vapor-permeability properties.

Conclusion

Acrylic and silicone plasters both have their pros and cons. They are popular choices for finishing building facades and are available as ready-to-use mixtures in a wide range of colors. However, silicone plaster offers long-lasting aesthetics for facades, maintaining a high-quality appearance over the years.