Universal Self Leveling Underlayment

VELOSIT SL 502 is a cementitious self leveling underlayment for concrete substrates. It creates a very smooth surface for coatings and floor coverings.

Typical applications:

  • Interior and exterior use
  • Suitable for permanently water immersed applications
  • Leveling of concrete slabs and floors
  • Cosmetic repair of surface defects on concrete floors
  • Structural repair of concrete 
  • Application thickness from 3 mm (1/8”) to 38 mm (1 ½“)
  • Self leveling screed
  • Floor heating systems
  • As a binder for terrazzo floors


  • Minimal shrinkage/expansion under dry resp. wet curing conditions minimizing the risk of micro-cracking
  • Excellent flow with long slump life
  • Smooth surface profile
  • Fast air release with minimal requirement for agitation
  • Ready for covering with ceramic tiles after 4 hours, for moisture sensitive floor coverings after 16 hours
  • 30 – 40 Min. working time and 16 MPa (2340 psi) compressive strength after 4 hours
  • Final strength of more than 50 MPa (7250 psi) after 28 days
  • Meets the requirements of EN 13813 class CT-C50-F7
  • Open to foot traffic after 3 hours
  • Excellent adhesion to properly prepared concrete
  • Good resistance against CO2 and Chloride penetration duets a very tight pore structure
  • Excellent water resistance, no strength loss under water
  • Good weathering resistance
  • Good sulfate resistance
  • Colors: Light gray, gray, anthracite

Associations & Memberships:

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