Unlike most sealants which lose their porous and breathable properties after product application, silicones are very durable and retain their natural gas permeable structure, making them ideal for long term sealing applications. The combination of three key factors is why silicones can achieve such a high level of water repellence, even on the most challenging surfaces.
Firstly, the silane molecule has a highly negative surface energy, which causes water molecules to roll off the surface rather than soaking in. This prevents external moisture from penetrating into the substrate and causing corrosive damage such as efflorescence, spalling and pitting.
As the silicone coating film is breathable, the gas water molecules are able to enter and exit freely through the coating layer, maintaining the wall's own internal moisture balance without blistering or surface peeling. This also helps to prevent a build-up of moisture in the wall, which can cause deterioration, cracking and swelling.
The silicone barrier also blocks corrosion damage from atmospheric acid rain, by stopping the ions in the rainwater from reacting with the calcium oxide in the wall. This helps to preserve the structural integrity of the building and prolong its lifespan.
The spray silicone waterproofing agent is suitable for a variety of masonry surfaces including brick, stone, concrete and pebbledash. The breathable membrane allows the moisture inside to evaporate but prevents water penetration. It can be overpainted with masonry paint once fully cured and is not affected by UV light.