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The waterproofing system for a self-leveling floor begins with the surface preparation of the concrete substrate. Initially, the prepared substrate is primed with KÖSTER Polysil TG 500, which hardens the substrate and reduces the mobility of salts. Once primed and cured, a two-layer application of KÖSTER NB 1 Grey waterproofing slurry follows, (2 x 1.5 kg/m²). It provides a watertight, crystallizing mineral waterproofing suitable for both positive and negative side applications. It is known for its high pressure, abrasion, and chemical resistance. After this, a two-layer waterproofing of KÖSTER NB 4000 (2 x 1.2 kg/m²) is applied, offering elastic, crack-bridging protection that withstands pressurized water after 24 hours and is ideal for various structures including basements and foundations. Optionally, the system is topped with KÖSTER SL Flex, a high-quality, fast-setting, self-leveling underlayment that forms a smooth, high-strength surface suitable for various finishes such as carpet or tiles, and even over-floor heating systems. In this case, KÖSTER SL Flex is designed for application in thicknesses more than 8 mm and a maximum of 15 mm. KÖSTER CT 215 Universal Floor can be used as a final flooring. KÖSTER CT 215 Universal Floor is a solvent-free, water-based epoxy resin, designed to prime and coat concrete surfaces offering not only protection, but also a silky matte finish that enhances aesthetics while ensuring easy maintenance, offering a durable, easy-care, and vapor-permeable finish. Always adhere to the specifications in the respective Technical Data Sheets. For detailed installation guidelines, consult the latest System Data Sheet.
