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Waterproofing of Basement Slab using Koster KSK SY15 Membrane - Robust under-slab waterproofing system.

Verified by manufacturer 3 months 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 certified system for waterproofing to a concrete slab below ground level, to protect against ground water, moisture, hydrostatic pressure and radon gas. In accordance with BS8102.

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Application

  • Waterproofing to basement walls, including external basement and IFC walls.
  • Waterproofing for foundations, floor slabs under screeds, basement and below ground slabs and foundations.
  • Internal basement waterproofing when in loaded/ sandwiched constructions.
  • Resistant barrier against ground moisture, including: soil moisture and retained seepage, hydrostatic pressure, splash water and capillary-rising moisture.
  • Effective vapour and radon barrier.
  • Waterproofing to balconies, terraces and podium decks.
  • Waterproofing against hydrostatic pressure.
  • Positive side waterproofing.
  • External waterproofing to lift pits.
  • Waterproofing to precast panels.
  • External waterproofing to bridges, tunnels, and other civil structures.

Description

This waterproofing and gas protection system benefits the design and installation of basement and below ground slabs. The system incorporates a high-performance, cross-laminated, self-adhesive bitumen membrane which offers high puncture and tear resistance as well as the ability to resist ground water/ moisture and radon gases.


The Koster below slab system consists of the following products: Koster KBE liquid film, Koster KSK SY 15, Delta geo drain quattro, Koster Fix Tape 15 SY.


This multi-layered system satisfies the requirements of NHBC Standards, Chapter 5.4 'Waterproofing of basements and other below ground structures to all grades'.  

Used with 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.


Features and benefits:

  • Radon-resistant.
  • Resistant to hydrostatic pressure.
  • Resistant against positive side pressure.
  • Crack-bridging to 2 mm.
  • Instantly watertight and rainproof.
  • Fully watertight coating.
  • Acceptable to NHBC.
  • Easy application.
  • Can be applied to most substrates, including over existing bitumen coatings.
  • Self-adhesive membrane.
  • 1.5 mm overall thickness.
  • Water-based primer.
  • 24 kg bucket size: W 245 024 – Koster KBE liquid film.


Inspection of damp-proof coatings and membranes:

Any ripples or air bubbles are to be cut with and re adhered. 

Oversized patches using Koster KSK SY15 are to be placed to cover the defect and Koster KBE liquid film used to over coat.


For further information or design assistance, please contact Technical@kosteruk.com and we will be happy to assist.

General information

Color

Black

Finish

Smooth

Guidance for specification option:

A black smooth bitumen sheet membrane with an HDPE top layer. System designed to be buried below ground or encased between concrete layers.

Material

Bitumen

Guidance for specification option:

  • W 815 105 – Koster KSK SY15 – Self-Adhesive Bitumen Rubber membrane.
  • W 815 002 – Koster Fix Tape 15 SY – Self-Adhesive Bitumen Rubber Tape.
  • W 245 024 – Koster KBE Liquid Film – Water-based bitumen Rubber liquid coating.


Shape

Rectangle

Length

1050 mm

Width

20000 mm

Height

1.5 mm

Warranty description

Ten year

Guidance for specification option:

All materials mentioned are covered by the Koster 10-year product warranty.

Uniclass

Ss_32_80_79_75 Self-adhesive bitumen membrane external tanking systemsPrimary

CAWS

J30/110 Cold-applied tanking

Product range

Internal Basement Waterproofing Systems
External Basement Waterproofing Systems
Sealant for Precast Concrete

Specification data - Self-adhesive bitumen membrane external tanking systems

System performance

Conforms to BS EN 13969: 2004.

Substrates

-

Preparation

Required, floated concrete finish to blinding layer.

Pointing and filling mortar

Koster Repair Mortar Plus.

Primer

Koster KBE liquid film – diluted, bitumen primer.

Guidance for specification option:

Koster KBE Liquid Film:

  • Highly elastic water-based bitumen/ rubber liquid waterproof coating.
  • Koster KBE Liquid Film can be diluted 2:1 with water, and applied to a mineral substrate to act as a high-performance primer, and used undiluted as a seam/ overlap sealer and detailing compound. 
  • When used as a primer, it is rolled or brushed onto a prepared substrate.
  • As a detailing coating, it is brush or trowel-applied.


Tanking membranes

-

Waterproof sheets

Koster KSK SY 15, bitumen sheets.

Guidance for specification option:

Koster KSK SY15:

  • This cold-applied self-adhesive bitumen rubber membrane is the core to the overall below slab waterproofing system. 
  • Supplied in large 1.05 x 20 m rolls, it simplifies on site installation and speeds up construction, as it is immediately waterproof, and offers maximum protection against all forms of groundwater and radon gas.

Protection

-

Horizontal protection

Below ground rated insulation.

50 mm screed.

Vertical protection

Delta geo drain quattro, plastics sheets.

Jointing tape

Koster fix tape 15 SY, self-adhesive bitumen tape.

Guidance for specification option:

Koster Fix Tape 15 SY:

  • 200 mm wide cold-applied, self-adhesive sealing strip made from bitumen/ rubber. 
  • This tear-resistant tape is cross-laminated, and once installed, is immediately water-proof and rain-proof. 
  • Used as a perimeter tape, it provides a connection between the vertical and horizontal sections of the basement slab, and a connection for the primary external waterproofing on basement walls.
  • See 'Waterproofing of External Basement Walls using Koster Deuxan 2C'.


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

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

Case studies

Park Plaza Hotel in London

Park Plaza Hotel in London

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