Koster SL Premium

Koster SL Premium

Koster SL Premium is a unique self-levelling, fast setting, high quality cementitious underlayment.

Koster SL Premium hardens to provide a smooth, level surface for subsequent flooring systems and creates a firm bond to the substrate.

Koster SL Premium’s fibre reinforced, non-shrinking compound can be applied in damp conditions and remain stable.

Koster SL Premium can be applied to a variety of substrates and is compatible with most adhesives.

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Koster SL Premium
  • High quality
  • Fast setting
  • Hardens tension free
  • Provides a smooth, level surface to receive subsequent flooring systems
  • Accepts all major floor coverings
  • Compatible with most adhesives
  • Resistant to abrasion and wear
  • Intended for interior use
  • Self-Levelling
  • Suitable to be pumped or poured
  • Single component
  • Non-Degrading
  • Fibre Reinforced
  • Non-Shrinking
  • Suitable for uneven surfaces
  • Suitable for behind membrane
  • Compatible with VAP 2000 system

Directly after use, tools/machinery must be cleaned with water.

Koster SL Premium can be applied in thickness layers between 5mm and 15 mm.


Depending on temperature Koster SL Premium may take between 24 and 72 hours to dry.

Always wear protective clothing, gloves and safety goggles during the processing and application of Koster SL Premium. Avoid direct skin/eyes contact. If contact does occur rinse area well with clean water and soap, then seek medical advice.

Product Details
Koster SL Premium
Product Code:
Bulk Density (powder):
Application temperature:
Min. +5°C
Compressive strength (28 days):
Approx. 45N/mm²
Pot life:
If stored in original packaging in temperatures between +10 °C and +30 °C the material can last for a minimum of 6 months
Layer Thickness:
Technical Drawings

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