Protection for Generations to Come - Wacker Chemie AG


Protection for Generations to Come

Horizontal Holes

Workers drilled horizontal holes into the exterior wall ten centimeters above the ground and spaced ten centimeters apart. These holes were then used to inject SILRES® BS SMK 550 into the masonry. (see image below)

The first step was for workers from the municipal department of public works to drill horizontal holes into the exterior wall ten centimeters above the ground and spaced ten centimeters apart. They then injected SILRES® BS SMK 550 into these holes, each of which had a diameter of eight millimeters. This solvent-free, silane/siloxane concentrate had been diluted 1:9 to form a microemulsion. SILRES® BS SMK 550 has been specially designed for use in chemical dampproofing processes, where it suppresses rising damp.

Using pumping equipment from Desoi, the specialists injected the water-repellent agent into each hole for roughly five minutes at a pressure of two to five bar. In the process, the silane/siloxane mixture spread through the masonry,and the workers plugged up the holes with mortar one week later. Once the masonry is dry, a barrier forms that is impermeable to water – experts refer to this as a hydrophobic horizontal barrier – and reliably counteracts rising damp caused by capillary action.

Due to their very small particle size, silicone microemulsions are exceptionally well suited for this method of combating moisture – even in dense masonry. SEM images show that silicone microemulsions allow diffusion to continue and do not seal off or block capillary action. Instead, the agent reacts with capillary surfaces, rendering them permanently hydrophobic. “That effectively protects the wall from rising damp for generations to come,” Ackermann points out.

The diagram illustrates how silicone resin emulsion paint works: oxygen-silicon bonds (yellow) form a three-dimensional network, while the organic groups act as umbrellas, thus producing a water-repellent effect.