Rising moisture in masonry over a longer period of time can lead to considerable damages. Indication of these damages are salt efflorescence, flaking plaster, moist wallpaper and the formation of mold which can be harmful. KOSTER horizontal barriers stop rising moisture in new construction and existing buildings to protect the valuable building substance.
A horizontal waterproofing beneath walls in new construction is required to avoid rising moisture due to capillary action in masonry or concrete. For this application many KOSTER products can be used. KOSTER Fix-Tape 10 AW is a self adhesive waterproofing tape which is easy and fast to apply. Alternatively the waterproofing slurry KOSTER NB 1 Grey (mixed with KOSTER NB 1 Flex) or the crack bridging waterproofing material KOSTER NB Elastic Grey are used.
Always adhere to the specifications in the respective Technical Guidelines.
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 also 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 and also has a hydrophobizing effect.
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. Thereby rising moisture is stopped with the aid of its cause. 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 analyses of the moisture content and the salt content must be carried out.
In cases where damage is caused by rising moisture the old plaster has to be removed from the wall. After the installation of the horizontal barrier the application of KOSTER Restoration Plaster is required. 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 Plaster Coat creates 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 Silicon Paint White or KOSTER MF 1.
Always adhere to the specifications in the respective Technical Guidelines.
Horizontal barriers with pressure injection for voidless masonry
Fast and effective: The installation of a horizontal barrier via pressurized injection. When it is possible to ensure that the wall is free of cracks or voids, the horizontal barrier can be installed with a pressurized injection system. Cracks and voids which become apparent during the drilling process can be filled with KOSTER Borehole Suspension. After filling, the borehole is re-drilled.
Suitable injection liquids for this kind of application are KOSTER Mautrol® 2C and KOSTER Mautrol® Flex 2C. Two component materials have a faster setting time which causes a quicker blockage of the capillaries.
In cases where damage is caused by rising moisture the old plaster has to be removed from the wall. After the installation of a horizontal barrier the application of KOSTER Restoration Plaster is required. 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 the 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 Plaster Coat creates 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 Silicon Paint White or KOSTER MF 1.
Always adhere to the specifications in the respective Technical Guidelines.
When masonry is just slightly moist often a restoration with KOSTER Restoration Plasters is enough to dry the wall and stop damage from occurring. In this case the old plaster has to be removed from the wall and the joints raked out. All loose particles have to be removed to provide a stable and absorptive, openpored surface. Priming with KOSTER Polysil TG 500 optimally prepares the masonry for the application of KOSTER Restoration Plaster. KOSTER Polysil TG 500 hardens the substrate as well as reduces the mobility of salts. Masonry repairs are carried out with KOSTER Repair Mortar Plus.
Before the application of the main plaster coat, a plaster key made from the chosen KOSTER Restoration Plaster mixed with KOSTER SB-Bonding Emulsion is applied to provide a larger surface area and to ensure an optimal bond to the substrate. 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 Plaster Coat creates 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 Silicon Paint White or KOSTER MF 1.
Always adhere to the specifications in the respective Technical Guidelines.
