Application

  • For use as a waterproofing membrane on flat and pitched roof structures with additional top coat for UV-protection for exposed roofs.
  • For use as a waterproofing membrane underneath planting or hard landscaping on podium areas.
  • For use as a waterproofing membrane underneath extruded polystyrene (XPS) insulation as part of an inverted or vegetative roof system.
  • For use as a waterproofing membrane for other concrete structures and on non-trafficked concrete areas with an additional top coat for UV-protection.

Description

A two component, elastic, crack bridging, rapid-curing modified polyurethane/ polyurea-hybrid membrane. For machine application only. Suitable for use in hot and tropical climatic conditions.

Features and benefits:

  • Solvent free.
  • Fast application - application with two-part hot spray equipment.
  • Fast curing - over coating with top coat possible after approximately ten minutes.
  • 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 breathe.
  • Good adhesion to most substrates.

Applications:

  • For use as a waterproofing membrane on flat and pitched roof structures with additional top coat for UV-protection for exposed roofs.
  • For use as a waterproofing membrane underneath planting or hard landscaping on podium areas.
  • For use as a waterproofing membrane underneath extruded polystyrene (XPS) insulation as part of an inverted or vegetative roof system.
  • For use as a waterproofing membrane for other concrete structures and on non-trafficked concrete areas with an additional top coat for UV-protection.

General information

Uniclass 2015

Pr_35_31_68_64 Polyurethane (PUR) waterproof coatingsPrimary

CAWS

J31/353 Waterproof coating

Specification data - Polyurethane (PUR) waterproof coatings

Product Reference

Sikalastic®-851 R

Standard product features

Chemical base:

Modified polyurethane/ polyurea-hybrid.

Colour (mixed):

Grey (RAL 7004, approximate).

Technical properties:

  • Density (mixed, to BS EN ISO 2811-1): 1 kg/L (approximate, at 23°C).
  • Solid content by weight: >99%.
  • Viscosity (component A and B): 2300 mPas (approximate, at 23°C).
  • Tensile strength (to DIN 53504): 11.0 N/mm² (approximate, after 28 days, at 23°C).
  • Elongation at break (to DIN 53504): 350% (approximate, after 28 days, at 23°C).
  • Crack bridging ability (to BS EN 1062-7): Dynamic crack-bridging class B 4.2; static crack-bridging class: A 5.
  • Resistance to root penetration (to DIN 4062): Free of penetration of the roots, free of growth into the ground.
  • Reaction to fire (to BS EN 13501-1 and BS EN ISO 11925-2): Euroclass E.
  • Chemical resistance: Generally resistant to bitumen and alkalis.
  • Thermal resistance: Short term resistant to mastic asphalt (hot poured asphalt) applied at a maximum of 240°C. Elastic properties are maintained at temperatures as low as -30°C.

Application requirements:

  • Ambient air temperature: 8–50°C.
  • Relative air humidity: 85% (maximum).
  • Substrate temperature: 5–55°C (≥3°C above dew point).
  • Substrate moisture content: ≤4% (by weight). No rising moisture.

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