Rising (or wicking) moisture is among the most frequently encountered causes of damage in masonry walls. The results are clearly identifiable through the spalling of plaster, damaged joints and bricks, and through salt efflorescence and algae growth. Damage from rising moisture can be avoided by the installation of a horizontal barrier.
The easiest and most successful KOSTER system to install a horizontal barrier in existing walls is the KOSTER Suction Angle System with KOSTER Crisin®76. KOSTER Crisin®76 is a very thin fluid resin which penetrates into the smallest capillaries in the building material, stops the capillary action permanently.
Boreholes are drilled regularly spaced depending on the wall thickness. KOSTER Crisin®76 is injected without pressure into the wall via the KOSTER Suction Angle and the KOSTER Capillary Rod, which acts as a wick. The pressureless system uses the same capillary action which is the cause for rising damp, so that rising moisture is stopped. The big advantage of the KOSTER Capillary Rod is that it doesn’t waste material in cracks or voids. Only where the rod touches the wall of the borehole will the material be released.
In some cases, such as in less moist walls, KOSTER Mautrol Liquid Sealant can also be applied. Before the application, an analysis of the moisture content and salt content must be carried out.
In cases where damage is caused by rising moisture, the old plaster must be removed from the wall. After the installation of the horizontal barrier, apply KOSTER Restoration Plaster. KOSTER Restoration Plaster allows the masonry to dry without damage. KOSTER Restoration Plasters are open to vapor diffusion and are hydrophobic. Salts remaining in the wall are absorbed by the KOSTER Restoration Plasters so that salt doesn’t effloresce to the surface, and doesn’t cause damage to the plaster or paint.
KOSTER Restoration Plasters are available in different varieties (grey, white, fast and light). KOSTER Restoration Plaster 2 White is often used in older buildings without subsequent painting. KOSTER Restoration Plasters create a very smooth surface and can be applied when desired to meet architectural goals. KOSTER Restoration Plasters can only be painted over with breathable (open to vapor diffusion) paints such as KOSTER Silicone Paint White or KOSTER MF 1.
Always adhere to the specifications in the respective Technical Guidelines.