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Versatile mineral coating

For your information, the information provided is based on the available text and technical data. It is always recommended to consult the official product documentation or contact the manufacturer, KÖSTER BAUCHEMIE AG, for detailed and up-to-date information on the product and its application.

Sealing building structures from the inside and outside on the positive side

Restoration of buildings

Repair and restoration of old bituminous or mineral sealing layers

Rapid drying sealing requirements, especially at temperatures from +2 °C to +20 °C

Sealing under ceramic tiles in interior and exterior areas (load class W4-E)

Horizontal barrier under masonry walls (used as a DPC system)

Gluing of insulation panels on supporting walls from the positive side

Repairing a scratched product or fillet mortar by filling with kiln-dried silica sand

Areas of application:

Resistant to water pressure after 24 hours (water column of 10 m)

bridging cracks:

PG-FDP (24 hours, +4  Celsius): > 2.0 mm by 4.0 mm DFT

PG-MDS (24 hours): > 0.4 mm by 3.2 mm DFT

DIN EN 14891 (standard climate): > 3.5 mm by 2.0 mm DFT

DIN EN 14891 (-5  Celsius): > 1.7 mm by 2.2 mm DFT

Sealing capabilities:

Fast-curing, multi-functional, polymer-modified mineral coating

Waterproofing building structures inside and out

Resistant to rain shortly after application

Can be exposed to pressurized water after 24 hours

Viscoplastic and crack bridging

Bitumen free and UV stable

Radon proof

Can be used for gluing insulation boards

Can be painted and painted over base plaster

Technical data:


Color: dark gray

Solids: approx. 90% by weight

Maximum aggregate size: approx. 0.4 mm

Density (+20 degrees Celsius): 1.1 g/cm³

Application temperature: +2°C to +30°C

Working time: approx. 45 minutes

Resistant to rain after approx. 2 hours

Gluing of insulation panels: approx. 4 hours

Refill: approx. 16 hours

Radon-proof with a dry film thickness (DFT) of 3 mm

Water vapor diffusion resistance value (µ value): 3050


KÖSTER NB 4000 is a multipurpose polymer-modified mineral coating used for sealing building structures both inside and outside. It combines the advantages of polymerized bitumen thick film waterproofing (PMBC) and flexible mineral waterproofing into one product. Below are some main features and technical details


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