Koster KSK Cold-Applied Self-Adhesive Waterproof Membrane

Koster KSK Cold-Applied Self-Adhesive Waterproof Membrane

Koster Aquatecnic Ltd Third party certifications:
  • QA Certificate

    QA Certificate

    Certificate type

External (Type A) waterproofing system based on cold applied, self-adhesive sheet membrane.

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Exterior basement waterproofing with KÖSTER KSK cold applied, self-adhesive waterproofing membranes is fast, clean, and easy. No drying time, instantly watertight, with a tight control on consumption. Apply a primer coat of KÖSTER KBE Liquid Film diluted 1 to 2 with water on clean, solid substrates. In temperatures below 5°C down to -10°C use KÖSTER KSK Primer SP. Pipe penetrations are sealed using flanges cut to size from KÖSTER KSK Membranes. To avoid stresses in the elastic waterproofing, rounded fillets made of KÖSTER Repair Mortar are installed at all internal corners.

The area waterproofing is generally made with KÖSTER KSK SY 15. It is applied crease-free to the substrate. The membranes are overlapped by 100 mm. All overlaps are overcoated with undiluted KÖSTER KBE Liquid Film. On vertical areas the top edge is mechanically fastened and these fasteners are also coated with KÖSTER KBE Liquid Film. In low temperatures down to -10°C pre-condition the Koster KSK SY15 to a temperature of + 20°C. In this case the overlapped edges, corner details and mechanical fasteners are overcoated with KÖSTER BS 1 Bitumen Paste.

Before backfilling the waterproofing should be protected from mechanical damage and settling with below grade insulation boards, protection boards, or 3 layer drainage sheet.

System Components:

  • Primer: KÖSTER KBE Liquid Film Diluted 1 to 2 with water.
  • Fillet: KÖSTER Repair Mortar – Installed at wall/ floor junctions to prevent stress.
  • Waterproofing layer: KÖSTER KSK SY 15 with (all overlaps overcoated with KÖSTER KBE Liquid Film).
  • Typical Protective layer: Delta Geodrain Quattro 4 layer drainage sheet.

General information

Uniclass 2015

Pr_25_57_08_08 Bitumen sheetsPrimary


J40/180 Self-adhesive bitumen gas retardant damp proofing/ tanking

J40/45 Self-adhesive bitumen gas retardant damp proofing/ tanking

Specification data - Bitumen sheets

Product Reference

Koster KSK Cold-Applied Self-Adhesive Waterproof Membrane


KÖSTER KBE Liquid Film

Diluted 1 to 2 with water for priming of porous substrates prior to waterproofing with KÖSTER KSK.


Designed for application at low temperatures.


Not required

KÖSTER Bikuplan® Special Joint Tape

Waterproofing layer

KÖSTER Bikuplan® KSK AW 15

For main area waterproofing.

KÖSTER KBE Liquid Film

Undiluted for overpainting all overlap joints to give a double seal.

Product Options

Waterproofing layer to BS EN 13969:

- KÖSTER Bikuplan® KSK AW 15:

Cold applied, self adhesive rubber/ bitumen waterproofing membrane, with a double laminated highly tear-resistant polyethylene foil on top. The membrane is highly flexible, immediately waterproof and resistant to driving rain. It is crack bridging and suitable for application on cold substrates. For waterproofing of basements and base slabs. Suitable for application down to 10 °C. Radonproof.

- KÖSTER Bikuplan® KSK SY 15:

As above, suitable for application from 5–30°C.


Third party certifications

  • CE Marking : According to EN 13969:2004 Flexible Sheets for Waterproofing

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