13/07/2026
KÖSTER Polyflex 2K is a professional two-component, polymer-modified, rubber-bitumen waterproofing material. Suitable for application on mineral-based substrates, it offers a wide range of applications from foundation and retaining wall waterproofing to terraces and balconies. The product is CE certified and complies with the DIN EN 15814 standard, with an approved fire reaction classification.
KÖSTER Polyflex 2K is a two-component rubber-bitumen waterproofing product consisting of:
Liquid Component: Fiber-reinforced rubber-bitumen emulsion
Powder Component: Cement-based powder blend enhanced with chemical additives
When mixed together, these two components form a highly elastic and durable waterproofing membrane on the applied surface.
According to the technical specifications, KÖSTER Polyflex 2K is suitable for:
Foundation waterproofing systems
Retaining wall waterproofing
Balcony waterproofing
Terrace waterproofing
Mineral-based substrates such as concrete, screed, plaster, and mortar
The product provides excellent adhesion and flexibility on large surfaces, ensuring long-lasting waterproofing performance.
Rubber-bitumen based
Polymer modified
Two-component formulation
Suitable for mineral-based substrates
Complies with DIN EN 15814
Approved fire reaction classification
CE certified
Forms a flexible waterproofing membrane after application
3.0–6.0 kg/m²
(Depending on the substrate condition and application requirements.)
32 kg set
24 kg liquid component
8 kg powder component
It can be applied to mineral-based substrates such as concrete, screed, plaster, and mortar.
Yes. It consists of a liquid rubber-bitumen emulsion and a cement-based powder component.
It is used for foundation waterproofing, retaining walls, terraces, and balconies.
The recommended consumption ranges from 3.0 to 6.0 kg/m².
Yes. It complies with DIN EN 15814, has an approved fire reaction classification, and is CE certified.
