Ground Moisture Waterproofing System

Waterproofing of internal basement areas in existing buildings can be carried out with mineral waterproofing systems. They have excellent bonding characteristics to mineral surfaces and 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, KÖSTER Polysil TG 500 is used. It hardens the substrate as well as reduces the mobility of the salts. Masonry repair and the installation of a fillet at the wall-floor junction are done with KÖSTER Repair Mortar Plus. KÖSTER NB 1 Grey is used as the waterproofing layer. For a faster installation, KÖSTER NB 1 'Fast' should be used. To harden the material, KÖSTER Polysil TG 500 is sprayed on top of the slurry. To get a lighter surface finish use KÖSTER NB 2 White for the final coating. Pipe penetrations are waterproofed using KÖSTER KB-Flex 200 and sealed with KÖSTER KB-Fix 5.

In the case of damage to basement walls caused by moisture generally, KÖSTER Restoration Plaster should be applied. It is especially designed for the restoration of masonry with high salt and moisture contents, helps to dry out the wall and absorb remaining salts. It doesn’t contain lime or gypsum, is open to water vapour diffusion and creates a healthy and comfortable room climate.

Before the application of the main plaster coat, a plaster key made from the chosen KÖSTER Restoration Plaster mixed with KÖSTER SB-Bonding Emulsion is applied first to provide a larger surface area and ensure an optimal bond to the substrate. KÖSTER Restoration Plasters are available in different varieties (grey, white, fast and light). KÖSTER Restoration Plaster E Fast White is often used in older buildings without subsequent painting. KÖSTER Plaster Coat creates a very smooth surface and can be applied when desired to meet architectural needs. KÖSTER Restoration Plasters can only be painted over with breathable (open to vapour diffusion) paints such as KÖSTER Silicon Paint White or KÖSTER MF1.

System Components:

  • Primer: KÖSTER Polysil® TG 500.
  • Surface leveller: KÖSTER Repair Mortar Plus.
  • Fillet: KÖSTER Repair Mortar Plus.
  • Waterproofing layer.
  • Sealant: KÖSTER KB-Flex 200 and KÖSTER KB-Fix 5.
  • KÖSTER Restoration Plaster: To provide a key and finishing coat.
  • Paint.

Specification data

Product Reference

Internal Basements Waterproofing System

Waterproofing layer

KÖSTER NB 1 'Fast'



For a lighter surface finish as final coating.

KÖSTER Polysil® TG 500

To harden the waterproofing slurry.


KÖSTER Restoration Plaster 'E' Fast Grey

KÖSTER Restoration Plaster E Fast White

May not need subsequent painting.

KÖSTER Restoration Plaster Coat

For a fine, smooth finish.


KÖSTER Silicone Paint White

Product Options


- KÖSTER Restoration Plaster 'E' Fast Grey:

Diffusion-open, salt-resistant restoration plaster. It can be applied manually or by machine. Very high porosity and hydrophobic properties. Prevents the formation of condensate.

- KÖSTER Restoration Plaster E Fast White:

Diffusion-open, salt-resistant, high compressive strength, white restoration plaster with very high porosity and hydrophobicity. It prevents the formation of condensate. It can be applied manually or by machine.

- KÖSTER Restoration Plaster Coat:

Fine-grained, diffusion-open, water-repelling plaster coat on cement basis for application on top of KÖSTER Restoration Plaster.

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