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Sikalastic 621 TC (US) is a cold applied, highly elastic, aliphatic, single component, moisture-triggered polyurethane base and top coat designed for easy application as part of Sikalastic RoofPro roofing and waterproofing systems.

Sikalastic 621 Product Data Sheet


Where to Use

Sikalastic RoofPro 10, 15, 20 and 25 year systems, including Sikalastic RoofPro Direct, Recover, Inverted, Green and Built Up systems for both new construction and refurbishment.

  • Ideal for roofs displaying complex details and geometry or when accessibility is limited.
  • Effective and cost efficient life cycle extension of existing roofs.
  • Highly reflective Sikalastic 621 TC (US) in White (RAL 9016) suitable for cool roofs and solar roof assemblies.


  • Proven technology with over 25 year track record
  • Single component - no mixing and ready to use
  • Fully reinforced with highly conformable Sika Reemat
  • Moisture triggered chemistry that is rapidly weatherproof after application
  • Highly elastic and crack bridging
  • Seamless and fully adhered
  • Vapor permeable
  • Resistant to UV and common atmospheric chemicals


  • FM Approval Standard 4470 for Class 1 Roof Covers
  • ASTM E-108-00 Spread of Flame meets Class A at a slope of 1 in 12
  • Simulated wind Uplift pull testing meets Class 1-990
  • Simulated hail damage testing meets rating of SH
  • Miami-Dade County NOA for Roof Maintenance Coating Systems and Roof Systems over Concrete and
  • Steel Decks
  • USGBC LEED rating: Conforms to LEED SS Credit 7.2 for Heat Island Effect - Roof with SRI >/=78
  • Energy Star approval for Sikalastic 621 TC (US) White (RAL 9016)
  • Meets ASTM D7311-07: Standard Specification for Liquid-Applied, Single-Pack, Moisture-Triggered,
  • Aliphatic Polyurethane Roofing Membrane.

Areas of Application

Sound concrete and cementitious screed, metals, wood, modified bitumen, mineralized felt, EPDM, hypalon,TPO, sprayed polyurethane foam, brick and stone, slate and tile, and existing liquid applied membranes.


  • 5 gal. pails

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