Polyurethane low odour liquid applied membrane for roof waterproofing

Sikalastic®-641 is a 1-part polyurethane, reinforced, low odour, cold-applied liquid membrane. It provides a UV-stable, seamless, elastic, low maintenance, durable, smooth waterproof finish using Sika's unique i-Cure technology. The product is suitable for hot and cold climates.

  • 1-part, no mixing, easy and ready to use
  • Thickness: ~1.50–2.2 mm
  • Resistant to UV exposure
  • Highly reflective (~RAL 9016, available on indent)
  • Resistant to yellowing
  • Cold applied – requires no heat or flame
  • Low odour - suitable for odour sensitive projects
  • High solids content
  • Seamless
  • Easy to detail with Sika® Reemat Premium
  • Easily recoated - no removal required
  • Vapour permeable
  • Applied by brush / roller
  • Elastic and crack bridging
  • Retains flexibility at low temperatures
  • Good adhesion to most construction substrates
  • Fast curing
  • Resistant to common atmospheric conditions
Sikalastic®-641 Sikalastic®-641