Koster NB 4000 - Waterproofing Liquid Coating System
Verified by manufacturer 6 months ago
ISO 9001 Quality Management
Certificate type
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.
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 | |
CAWS | J30/110 Cold-applied tanking |
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 guidanceThe 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:
Koster NB 4000 filled with quartz sand.Guidance for specification option:
Scratch coat.Guidance for specification option:
Manufacturer guidanceExisting 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:
|
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:
|
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. Guidance for specification option:
|
Sustainability data
Contains Red List materials | No |
Country of material origin | Germany |
Country of product manufacture | Germany |
Recyclability | No |
Recycled contentAs defined in clause 7.8 of BS EN ISO 14021 | 0 % |
Third party certifications
Literature
Koster Waterproofing Systems Company Brochure
Koster External Basement Waterproofing Brochure
Koster NB 4000 Brochure
Case studies
Flat roof overlay at historic lighthouse. Koster TPO Membrane.
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