KÖSTER Waterstop 15kg

In stock
£98.60 Ex VAT
£118.32 Inc VAT
Koster Waterstop is a fast setting, repairing mortar and expanding plug.

Rapid Waterstop

This waterstop product is used to quickly solve water leakages in concrete, masonry and natural stone structures. It’s also used to form fillets which are subject to hydrostatic pressure, to seal slotted walls, manholes, cables and pipe penetrations.

Through fast setting and slight expansion capabilities of the curing mortar, intense contact between the existing substrate and the mortar is achieved. This way, even cracks bearing pressurised water and water leakages can be sealed fast.

Koster Waterstop is the perfect solution for:

  • Repairs to existing substrates
  • Repairs to concrete and screeds
  • Detailing to dry pack joints
  • Construction joint detailing
  • For patch repairs
  • Filling tie bolt holes in concrete construction
  • Detailing around service penetrations
  • Plugging the structure prior to cavity drain installation

Using Koster Waterstop

The area to be waterproofed should not be subject to movement and the structure should be sound with a clean surface. Remove loose material from the surface around leakages. For sealing cracks and construction joints, cut them back to a minimum depth and width of 20mm. Dry substrates should be wetted thoroughly with water before application.

Mix Koster Waterstop with approx. 220 ml/kg of clean water homogeneously into a stiff mortar. Mix small amounts at a time due to the fast curing abilities.

In instances of leakages, the pre-stiffened mortar is pressed by hand into the cavity and then pressed on firmly approx 1-2 minutes (until cured). To prevent the escape of moisture around the surrounding area where leakage has occurred, the application of Koster NB 1 Grey is advised.

Waterproof & Dry - Trusted independent suppliers of Delta products

If you have any technical questions about Koster waterstop, call our expert team on 0203 947 2972. Find out more about Koster waterproofing systems or browse our full range of Koster Tanking products.


  • Watertight
  • Fast setting
  • Can be applied to all mineral substrates
  • Can be used internally and externally on concrete, brickwork, blockwork or masonry
  • Easy, seamless application
  • Excellent adhesion
  • Suitable for new construction and repair on existing structures
More Information
Model DMS 172
Manufacturer Delta Membranes
Packaging Loose powder in bucket
Size 15 kilo bucket
Dillution As per technical data sheet
Coverage 2 kg / l void
Colour Grey
CE Mark Yes.
Country of Manufacture Germany

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