KÖSTER NB 1 Grey can be used in new construction and repair for horizontal and vertical waterproofing of concrete, masonry or cementitious plaster, on porous concrete, on shotcrete, in wet rooms, bathrooms, showers, new basements, inside of basements, inside elevator shafts, tunnels, leaking retaining walls, underside of leaking ceilings, tanks, silos, sewage treatment plants, manholes, drinking water tanks etc.

It can be used for waterproofing against ground moisture, and for non-pressurized and pressurized water. Product for structural and non structural repair for concrete.


KÖSTER NB 1 Grey is a mineral coating containing crystallising and capillary-plugging agents.

Features and Benefits:

  • Resistant to pressure and abrasion as well as chemical and sulphate.
  • Waterproof to pressurized water up to 13 bar.
  • Long pot life.
  • Seamless application.
  • Easy application - fast and easy to use.
  • Positive and negative side waterproofing against pressurized water.
  • Crystallizing waterproofing system.
  • Penetrates into the substrate and creates a chemical and mechanical bond that will last as long as the wall itself - inseparable waterproofing-substrate bond.
  • Open to water vapour diffusion.
  • Resistant against chlorides, sulphates and phosphates.
  • Abrasion-resistant.
  • Certified for drinking water environments.
  • Does not contain corrosion promoting ingredients.
  • No VOC, no emissions of environmentally-harmful ingredients.
  • Suitable for a wide variety of substrates.
  • Works also on masonry and on very porous substrates like shotcrete, aerated concrete and cinderblock.
  • Suitable for moist surfaces.
  • Substrate does not have to be continually kept wet to cure.
  • Can seal the hairline cracks caused by the shrinkage and settlement of the surface (self-healing).
  • Inhibits salt movement in the substrate when used as a system together with KÖSTER Polysil TG 500.

General information



Uniclass 2015

Pr_20_31_53_96 Waterproof mortarsPrimary


D40/460 Proprietary coating

M60/210 Coating materials