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Waterproofing of External Basement Walls using Koster Deuxan 2C - Robust underground waterproofing system.

Verified by manufacturer 1 month ago

Koster Aquatecnic Ltd Third party certifications:
  • BBA Agrément Certificate

    BBA Agrément Certificate

    Certificate type

  • ISO 9001 Quality Management

    Certificate type

  • EPD

    EPD

    Certificate type

This is a BBA-approved system for waterproofing to a structure below ground level, to protect against ground water, moisture, hydrostatic pressure and radon gas, in accordance with BS 8102.

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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 vapour and radon barrier.
  • Waterproofing to balconies and terraces.
  • Internal basement waterproofing when in loaded/sandwiched constructions.
  • For waterproofing against hydrostatic pressure.
  • For positive 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.

Description

This BBA-approved positive/ external side waterproofing system can be installed over any mineral substrate, such as reinforced concrete, precast concrete, blockwork, brick and insulated concrete formwork (ICF).


The below slab waterproofing system consists of the following products: Koster Polysil TG500, Koster Bitumen Primer, Koster Repair Mortar Plus, Koster NB1 Grey, Koster Deuxan 2C, Koster Glass Fibre Mesh, Delta Geo Drain Quattro.


Features and Benefits:

  • Provides waterproof protection to basement walls, foundations, floor slabs, under screeds and in damp proofing situations.
  • Fully resistant against all forms of ground moisture including soil moisture and retained seepage, hydrostatic pressure, splash water and capillary rising moisture.
  • Crack bridging to 2 mm.
  • Resistant to rain after final coating is applied.
  • Chemical resistance.
  • Radon-resistant at 3mm thick.
  • BBA Approved.
  • Acceptable to NHBC.
  • Polymer modified bitumen coating (PMBC).
  • Liquid-applied.
  • Trowel or spray application.
  • Fully watertight coating.
  • Resistant against positive side pressure.
  • 4 mm dry film thickness.
  • Water-based.
  • Two-component.
  • Waterproof against 5 bar hydrostatic pressure.
  • 100% elongation at break.
  • Curing time of approximately 24 hours.
  • Third-party certification: BBA Certificate, Certificate no.: 18/5509i1.
  • 10 kg drum: Koster Polysil TG500.
  • 10 kg bucket: Koster Bitumen Primer.
  • 25 kg bag: Koster Repair Mortar Plus.
  • 32 kg bucket: Koster Deuxan 2C.


Inspection of waterproof coatings and membranes:

Layer thickness checks to be made using Koster thickness gauges during installation.  Photographic evidence of installation process and visual inspection of cured layers. A dry test can be carried out upon full cure. A “V” cut can be made allowing the thickness to be measured. Once satisfied, the test area is re-waterproofed as per standard application guidelines.


For further information. detailed application advice and detailed drawings, please contact technical@kosteruk.com.

General information

Color

Black

Finish

Trowelled

Guidance for specification option:

  • A cured Polymer Modified Bitumen coating covered with a studded drainage and protection membrane. System designed to be buried below ground.
  • Water-based Polymer Modified Bitumen Coating (PMBC), code: WW 252 032 Koster Deuxan 2C.

Material

Bitumen

Cement

Silicate

Styrene butadiene

Glass Fibre

Shape

Rectangle

Formless

Length

Bespoke

Width

Bespoke

Height

Bespoke

Warranty description

Ten year

Uniclass

Ss_32_80_03_16 Cold-applied liquid sandwiched tanking systemsPrimary

CAWS

J30/110 Cold-applied tanking

J20/110 Tanking

Product range

External Basement Waterproofing Systems
Sealant for Precast Concrete

Specification data - Cold-applied liquid sandwiched tanking systems

Substrates

-

Preparation

Required.

Guidance for specification option:

All application surfaces are to be fully cleaned, ideally using a high-pressure waterjet, to remove any shuttering release oils, mud and other contaminates. This should also remove any weak concrete from the surface. Use Koster Repair Mortars to repair any honeycombing or areas of damage as well as for ensuring the surface profile is smooth and even. Check carefully for any cracks or other defects.

All external junctions to be mechanically ground to remove sharp edges and ensure an even application for the system.

Pointing and filling mortar

Koster repair mortar plus.

Guidance for specification option:

  • This is a fast setting and expanding repair mortar. 
  • It is used for making strong and watertight repairs to the substrate, prior to the application of Koster waterproofing systems, and for forming fillets at internal junctions. 
  • For instance, a 40mm x 40mm concave fillet should be made at all wall to wall and wall to slab intersections. 


Primer

Koster bitumen primer.

Guidance for specification option:

  • For use when preparing to waterproof over old or existing bituminous coatings.

Koster polysil TG 500.

Guidance for specification option:

  • Deeply penetrating primer.
  • When sprayed onto the prepared wall surface, it works to consolidate and strengthen a sandy surface, reduces the absorbency of a mineral substrate, and can also act to immobilise salts within the capillaries.

Tanking

-

Coatings

Koster deuxan 2C.

Guidance for specification option:

Koster Deuxan 2C:

  • A liquid-applied thick film bitumen rubber membrane, which provides a thick, crack-bridging, water and gas proof finish to external basement slabs, walls and podium decks.
  • Koster Deuxan 2C is either hand or spray applied to a primed and prepared substrate to achieve a 4 mm dry film thickness in two coats.
  • Water-based.
  • Koster Deuxan 2C satisfies the relevant requirements of NHBC Standards, chapter 5.4 'Waterproofing of basements and other below-ground structures'. 
  • With the use of ancillary and complementary Koster products, it can encompass awkward detailing areas such as expansion joints and pipe penetrations to ensure a full and continuous waterproofing system.
  • Individual project specific detailed drawings are available along with expert technical advice.

Koster NB1 grey.

Guidance for specification option:

  • A liquid-applied mineral waterproofing coating which contains crystallizing agents.
  • Suitable for positive side and negative side waterproofing. 
  • Koster NB1 Grey possesses excellent pressure and abrasion resistance, as well as chemical and sulphate resistance.
  • When used as a part of this system, it is applied to the bottom area of the basement wall (1 m minimum), over the construction joint and down onto the vertical face of the slab. 
  • The NB1 Grey prevents residual water in the substrate or construction joint from interfering with the cure of the primary waterproofing layer.
  • It is brush or spray applied in a single-coat application.

Reinforcement

Koster glass fiber mesh.

Guidance for specification option:

  • This is a reinforcing fabric which has an extremely high tear resistance. 
  • It is installed between the coatings of Koster deuxan 2C. 
  • It is to be used on all substrates which are likely to be exposed to pressurised water and/ or in danger of cracking.

Sealant

Koster deuxan 2C.

Protection

Delta geo drain quattro.

Guidance for specification option:

  • A four-layer drainage and protection membrane, to be installed prior to backfill to completely cover the applied waterproofing system and, where possible, should extend from the land drain (at the lowest point) to 150 mm above ground level.


Joint tape

Koster joint tape 20.

Guidance for specification option:

Thermoplastic tape for sealing expansion and dilatation joints (up to 12 cm) and broad, irregular cracks. 

Koster joint tape 30.

Guidance for specification option:

Thermoplastic tape for sealing expansion and dilatation joints (up to 20 cm) and broad, irregular cracks.

Koster joint sealant FS.

Guidance for specification option:

For expansion joints with a width of up to 35 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 %

EPD

Third party certifications

BBA Agrément Certificate

BBA Agrément Certificate

BBA Certificate for Koster Deuxan 2C

BBA Agrément Certificate

BBA Agrément Certificate

BBA Certificate for Koster NB1 Grey

ISO 9001 Quality Management

ISO 9001 Quality Management

Koster Bauchemie AG - ISO 9001 Certificate

EPD

Koster NB1 Grey Environmental Product Declaration

EPD

Koster Repair Mortar Plus Environmental Product Declaration

Literature

Koster External Basement Waterproofing Brochure

Koster External Basement Waterproofing Brochure

Koster Waterproofing Systems Company Brochure

Koster Waterproofing Systems Company Brochure

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