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Koster NB 4000 - Waterproofing Liquid Coating System

Verified by manufacturer 6 months ago

Koster Aquatecnic Ltd Third party certifications:

  • ISO 9001 Quality Management

    Certificate type

  • BBA Agrément Certificate

    BBA Agrément Certificate

    Certificate type

A bitumen free Type A waterproofing material which provides both Internal or External waterproofing protection to below ground structures and swimming pools, as per BS 8102 2022.

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Application

For use in:

  • Waterproofing external basement walls.
  • Waterproofing to basement slabs and foundations.
  • Waterproofing to podium decks.
  • Waterproofing to insulating concrete formwork (ICF) basement walls.
  • As an effective radon barrier.
  • Waterproofing to balconies and terraces.
  • For waterproofing against hydrostatic pressure.
  • For positive and negative side waterproofing.
  • External waterproofing to lift pits.
  • Waterproofing to pre-cast panels.
  • External waterproofing to bridges, tunnels, and other civil structures.
  • Can be applied to most substrates.
  • Can be applied over old bitumen coatings.
  • Waterproofing to swimming pools and water tanks.

Description

Koster NB 4000 is a two component, crack bridging, polymer modified thick film mineral coating. It is unique in that it can deal with both external positive and internal negative side water pressure.


The materials speed of cure means that it is rain proof shortly after final application and in the case of external waterproofing, it can be backfilled after only 16 hours. When installed above ground level, the material can be disguised below renders or paints.


Koster NB 4000 can be filled with kiln-dried quartz sand to create fillets and fill surface roughness. The addition of the Koster NB 4000 Spray Additive improves the processing properties in terms of sprayability and application with a brush.


Features and benefits:

  • Bitumen and solvent-free material.
  • Very fast curing even at very low temperatures (from +2 °C).
  • Very early rain proof (two hours).
  • Compatible with old bituminous or mineral waterproofing systems.
  • Can be applied via trowel, spray or roller and brush.
  • Applicable on dry or slightly damp surfaces
  • Paintable and coatable with renders and facade plasters.
  • Crack bridging up to 3.5 mm.
  • Insulation boards can be installed after approx. four hours.
  • Easily applied to either horizontal or vertical surfaces.
  • Resistant to pressurized water after 24 hours.
  • UV resistant / stable.
  • Can be used under cement screeds.
  • Can be used under tiles on wet rooms.
  • Slightly vapor permeable.
  • A Type A internal or External waterproofing system as per BS 8102 2022.


For more advice or project specific guidance, please contact the Koster technical team at Technical@kosteruk.com.

General information

Color

Black

Finish

Trowelled

Brushed

Smooth

Material

Polymer-modified cement

Shape

Formless

Length

Bespoke

Width

Bespoke

Height

Bespoke

Warranty description

Ten year

Uniclass

Ss_32_80_03_14 Cold-applied liquid waterproofing systemsPrimary

CAWS

J30/110 Cold-applied tanking

Product range

Internal Basement Waterproofing Systems
External Basement Waterproofing Systems

Specification data - Cold-applied liquid waterproofing systems

Substrates

-

Preparation

Not required.

Koster Polysil TG 500.

Guidance for specification option:

Soft (for example aerated concrete), strongly salt contaminated and absorbent substrates must be prepared with Koster Polysil TG 500 (consumption 100—130 g/m², for strongly absorbent substrates up to 250 g/m² possible).

Manufacturer guidance

The substrate can be dry or slightly moist. It must be clean, free of oil and grease, and free of loose particles.

Pointing and filling mortar

Not required.

Koster Repair Mortar Plus.

Guidance for specification option:

  • Fillets can be made with Koster Repair Mortar Plus, whereby up to 20% Koster SB Bonding Emulsion is added to the water.

Koster NB 4000 filled with quartz sand.

Guidance for specification option:

  • Damaged concrete or plaster areas as well as cracks and holes with a depth of more than 5 mm can be repaired with Koster NB 4000 filled with quartz sand.
  • Mixed with quartz sand, Koster NB 4000 can also be used for creating fillets.

Scratch coat.

Guidance for specification option:

  • Defects, blowholes, holes smaller than 5 mm, and old bituminous substrates are prepared with an unfilled scratch coat which will also reduce the likelihood of bubbling.
  • Scratch coats are made from 2 parts of Koster NB 4000 and 1 part Quartz Sand CT 483 (0.06—0.36 mm).

Manufacturer guidance

Existing fillets should be checked for their functionality and, if necessary, recreated. Edges are to be chamfered.

Tanking

-

Coatings

Koster NB 4000.

Guidance for specification option:

Two-component, polymer modified mineral coating, for waterproofing of building structures inside and outside.

Reinforcement

Not required.

Koster Glass Fiber Mesh.

Guidance for specification option:

Areas prone to or in danger of cracking should have Koster Glass Fiber Mesh imbedded in the fresh first layer.

Protection

-

Horizontal protection

Not required.

Delta Geo Drain Quattro.

Vertical protection

Not required.

Delta Geo Drain Quattro.

Guidance for specification option:

Provide a mechanical protection (for example Delta Geo Drain Quattro) before backfilling.

Colour

Dark grey.

Guidance for specification option:

  • The product colour changes from green (fresh) to dark grey (fully cured).
  • The light green colour indicates that the polymer liquid is fresh and faultless.
  • The intensity of the green colour in fresh, may slightly vary according to the light exposure (light scattering) on the construction site, and only acts as an optic effect. It does not play any role in the quality or performance of the material.

Solids

~90%.

Guidance for specification option:

Approx. 90% by weight.

Size

~0.4 mm.

Density

1.1 g/cm³.

Manufacturer guidance

+ 20 °C.

Application temperature

+2°C to +30°C.

Working time

~45 minutes.

Guidance for specification option:

  • Rain resistant after approx. 2 hours.
  • Bonding of insulation boards approx. 4 hours.
  • Backfill approx. 16 hours.

Water vapour resistance factor

3050 μ.

Bond strength

≥0.5 N/mm².

Tensile strength

≥0.5 N/mm².

Crack bridging

PG-FDP (24 hs., + 4 °C): >2.0 mm at 4.0 mm DFT.
PG-MDS (24 hrs.): >0.4 mm at 3.2 mm DFT.
DIN EN 14891 (Std. climate): >3.5 mm at 2.0 mm DFT.
DIN EN 14891 (- 5 °C): >1.7 mm at 2.2 mm DFT.

Guidance for specification option:

  • Crack-bridging under standard conditions ≥0.75 mm.
  • Crack-bridging at low temperatures - 5 °C ≥0.75 mm.

Sustainability data

Contains Red List materials

No

Country of material origin

Germany

Country of product manufacture

Germany

Recyclability

No

Recycled content

As defined in clause 7.8 of BS EN ISO 14021

0 %

Third party certifications

ISO 9001 Quality Management

ISO 9001 Quality Management

Koster Bauchemie AG - ISO 9001 Certificate

BBA Agrément Certificate

BBA Agrément Certificate

BBA Certificate for Koster NB1 Grey

Literature

Koster Waterproofing Systems Company Brochure

Koster Waterproofing Systems Company Brochure

Koster External Basement Waterproofing Brochure

Koster External Basement Waterproofing Brochure

Koster NB 4000 Brochure

Koster NB 4000 Brochure

Case studies

Flat roof overlay at historic lighthouse. Koster TPO Membrane.

Flat roof overlay at historic lighthouse. Koster TPO Membrane.

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