In a repair situation the basement can be waterproofed from the inside without excavating the soil around the building. This means that the basement is permanently waterproofed without the necessity of doing any sort of earthwork. This type of waterproofing is possible with the KOSTER systems even when the wall has active leaks. Subsequently an open-diffusion restoration plaster is applied after successful waterproofing.
Internal basement waterproofing on foundation plate with mineral systems
Mineral waterproofing systems have the advantage of excellent bonding properties of the waterproofing material to mineral substrates, the bond between the individual waterproofing layers is excellent too. The longevity of such systems is ideally the lifetime of the building.
To avoid moisture rising through the wall due to capillary action, it is necessary to install a horizontal barrier beneath the wall made from KOSTER NB 1 Grey (mixed with KOSTER NB 1 Flex) or the crack bridging material KOSTER NB Elastic.
To harden the substrate the bottom slab is primed with KOSTER Polysil TG 500. At the wall floor junction a fillet made from KOSTER Repair Mortar plus is installed to prevent stresses in the subsequent waterproofing layers.
The area waterproofing is normally achieved with KOSTER NB 1 Grey mixed with KOSTER NB 1 Flex. For an extra fast application KOSTER NB 1 “Fast” is the product of choice. In case of pressurized water the waterproofing needs to be done with the KOSTER KD System. KOSTER Self Levelling Floor 15 is ideal for protecting the surface.
Alternatively the crack bridging waterproofing products KOSTER NB Elastic Grey, KOSTER NB Elastic White or KOSTER NB Elastic 1C White can be used to waterproof the floor slab.
Always adhere to the specifications in the respective Technical Guidelines.
Internal basement waterproofing on the foundation plate with cold-adhesive waterproofing membranes
Fast, easy application without long waiting times: Waterproofing of the floor slab with KOSTER KSK cold applied, self adhesive waterproofing membranes.
To avoid rising moisture, it is necessary to install a horizontal barrier underneath the wall with KOSTER Fix-Tape AW 10 Elastic. At the wall floor junction a filled made from KOSTER Repair Mortar plus has to be installed to prevent stresses in the subsequent waterproofing layers.
The priming is done with the solvent free KOSTER KSK Primer BL. Standardly the primed surface of the floor slab is waterproofed with the cold applied, self adhesive waterproofing membrane KOSTER KSK SY 15. Overlap the joints 10 cm.
The applied KOSTER KSK Membranes have to be protected from mechanical damage as work continues. It also needs to be connected to the vertical waterproofing of the adjacent walls.
Always adhere to the specifications in the respective Technical Guidelines.
Internal basement waterproofing in case of ground moisture non pressurised and pressurised water
Retroactive waterproofing in existing buildings needs to be done with mineral waterproofing systems. They have excellent bonding characteristics to mineral surfaces and also won’t detach from wet and moist substrates.
The material is applied to substrates that have to be sound and solid as well as free from bond inhibiting agents. Older plaster coats have to be removed and joints raked out and all loose particles have to be removed. As primer, KOSTER Polysil TG 500 is used. It hardens the substrate as well as reduces the mobility of salts. Masonry repair and the installation of a fillet at the wall-floor junction is done with KOSTER Repair Mortar Plus.
KOSTER NB 1 Grey is used as the waterproofing layer. For a faster installation use KOSTER NB 1 ”Fast”. To harden the material, KOSTER Polysil TG 500 is sprayed on top of the slurry. To get a lighter surface finish use KOSTER NB 2 White for the final coating.
Pipe penetrations are waterproofed using KOSTER KB-Flex 200 and sealed with KOSTER KB-Fix 5.
In the case of damage to basement walls caused by moisture generally KOSTER Restoration Plaster should be applied. KOSTER Restoration Plasters are specially designed for the restoration of masonry with high salt and moisture contents. KOSTER 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 and comfortable room climate.
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 ensure an optimal bond to the substrate. 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 MF1.
Always adhere to the specifications in the respective Technical Guidelines.
Internal basement waterproofing in case of flowing water
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 KOSTER KD-System.
KOSTER KD 2 Blitz powder is applied directly by hand to the active leakage. The powder reacts within a few seconds and forms a waterproof mortar. When the active leakages are stopped the waterproofing layer of KOSTER KD 1 Base, KOSTER KD Blitz powder and KOSTER KD 3 Sealer can be applied.
The material is applied to substrates that have to be sound and solid as well as free of bond inhibiting agents. Older plaster coats have to be removed and joints raked out and all loose particles have to be removed. Generally the substrate is primed by prewetting. Repairs and the installation of the fillet at the wall-floor junction are done with KOSTER Repair Mortar Plus.
KOSTER KD 1 Base is applied as the waterproofing layer and is brushed onto the substrate. KOSTER KD 2 Blitz Powder is rubbed onto the still wet surface, immediately creating a dry waterproofed layer. To harden and to strengthen this layer the third part of the system, KOSTER KD 3 Sealer, is applied. To waterproof the Basement completely another two layers of KOSTER KD 1 Base is applied over the first. Pipe penetrations are waterproofed with KOSTER KB-Flex 200 Sealing Paste and plugged with KOSTER KB-Fix 5.
In the case of damage to basement walls caused by moisture generally KOSTER Restoration Plaster should be applied. KOSTER Restoration Plasters are specially designed for the restoration of masonry with high salt and moisture contents. KOSTER 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 and comfortable room climate.
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 ensure an optimal bond to the substrate.
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 MF1.
Always adhere to the specifications in the respective Technical Guidelines.
