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Retro-active waterproofing in existing buildings needs to be done with mineral based waterproofing systems. They have excellent bonding characteristics to mineral surfaces and won’t detach from wet and moist substrates.
A very difficult situation: The basement waterproofing has to be done from the inside but the water is actively entering the building. Often the only solution is the KÖSTER KD-System. KÖSTER KD 2 Blitz Powder is applied directly by hand to the active leakage. The powder reacts within seconds and forms a waterproof mortar. The material is applied to substrates that have to be sound, solid, and free of bond-inhibiting agents. Older plaster coats must be removed; the joints raked out and all loose particles removed. Generally, the substrate is primed by prewetting. Repairs and the installation of the fillet at the wall / floor junction are done with KÖSTER Repair Mortar Plus.
KÖSTER KD 1 Base is applied as the waterproofing layer and is brushed onto the substrate. KÖSTER KD 2 Blitz Powder is rubbed onto the still wet surface, immediately creating a dry waterproofed layer. To harden and strengthen this layer, the third part of the system, KÖSTER KD 3 Sealer, is applied. To waterproof the basement completely, another two layers of KÖSTER KD 1 Base are applied over the first.
Pipe penetrations are waterproofed with KÖSTER KB-Flex 200 sealing paste and plugged with KÖSTER KB-Fix 5. In the case of damage to basement walls caused by moisture, generally, a KÖSTER Restoration Plaster should be applied. KÖSTER Restoration Plasters help to dry out the wall and absorb remaining salts. They don’t contain lime or gypsum, are open to water vapor diffusion, and create a healthy, comfortable room climate.
Before the application of the main plaster coat, a plaster key made from KÖSTER Restoration Plaster Key or the chosen KÖSTER Restoration Plaster mixed with KÖSTER SB-Bonding Emulsion is applied to provide a larger surface area and ensure an optimal bond to the substrate. KÖSTER Restoration Plasters are available in different varieties. KÖSTER Restoration Plaster White is often used in older buildings without subsequent painting. KÖSTER Fine Plaster creates a smooth surface and can be applied to meet architectural goals. KÖSTER Restoration Plasters can only be painted over with breathable paints such as KÖSTER Renovation Paint White.
Always adhere to the specifications in the respective Technical Data Sheets.
