Sikalastic®-851 R is a two part, elastic, 100% solids, very fast curing and coloured modified polyurethane liquid applied membrane with good chemical resistance. The product is very fast to apply with large areas being able to install quickly.

Sikalastic®-851 R is ideal for podium type applications requiring fast application, root resistance, and being fully bonded to the substrate, removal of the danger of water migration beneath the membrane if damaged.



As a waterproofing membrane:

  • on flat and pitched roof structures, with additional top coat for UV-protection for exposed roofs
  • underneath planting or hard landscaping on podium areas
  • underneath XPS insulation as part of an inverted or vegetative roof system
  • for other concrete structures and on non-trafficked concrete areas with an additional top coat for UV-protection.



  • Solvent free
  • Fast application with 2-part hot spray equipment
  • Fast curing - top coat possible after approx. 4 mins
  • Seamless waterproofing membrane
  • High Solids - contains no fillers
  • Excellent crack-bridging properties
  • Highly elastic and crack bridging
  • Low viscosity
  • Water vapour permeable – allows the substrate to breath
  • Good adhesion to most substrates
  • 12 months shelf life
  • Root resistant

for more information

If you would like to receive more information regarding Sikalastic®-851 R, please complete the form below and one of our sales team will be in contact: