Protection for Generations to Come
HYDROPHOBIC IMPREGNATION WITH SILANES
Renovation also included typical repairs to the foundation: workers from Burghausen’s department of public works removed the old paint with a high-pressure cleaner and filled cracks with mortar. A few days after removing the paint, workers repainted the entire building exterior with a silicone resin emulsion paint made by Sto – and based on SILRES® BS silicone resin from WACKER – giving the chapel’s render an efficient coating that is water repellent yet breathable.
“Silicone resins have a high affinity for mineral-based surfaces, which makes hydrophobicity an integral part of the paints – and that gives them a highly effective, lasting degree of protection,” explains Albert Hausberger, an applications engineer at WACKER who specializes in silicone resin emulsion paints.
Water Vapor Can Diffuse
Dr. Hartmut Ackermann in front of the Bergerhof chapel: this tiny place of worship also gives WACKER’s building protection experts an opportunity to demonstrate their high-performance products.
European standard EN 1062-1 categorizes silicone resin emulsion paints in the best possible class with respect to their permeability to water and water vapor. The unique properties of SILRES® BS silicone resins ensure that water from outside will bead on the building’s exterior, while still allowing evaporating water to diffuse out of the wall in the form of steam – a characteristic that prevents damage from accumulated moisture below the coating.
As a final measure, WACKER building protection experts also recommended hydrophobic impregnation of the chapel interior using SILRES® BS 290, a mixture of silanes and siloxane that has been diluted with organic solvents. A high-quality, general-purpose primer and water-repellent agent for mineral-based – and even highly alkaline – substrates, SILRES® BS 290 results in a lasting reduction in the amount of moisture that building materials absorb.
Thanks to this project, the interior, exterior and masonry of the Bergerhof chapel are now equally well protected from moisture, ensuring that subsequent generations will be able to enjoy the colorful fresco of Italian painter Nunzio Di Placido in all of its splendor.