FortiFlex® Butyl

Highly conformable for complex curved penetrations

FortiFlex® Butyl

FortiFlex® Butyl is a highly conformable, self-adhering waterproof flashing, making it ideal for sill pans, arched windows, and other curved penetrations. It features a lightwight creped film that resists UV exposure for up to one year and delivers exceptional stretch and minimal bunching. FortiFlex Butyl is made with a unique butyl formulation that maintains high tack even at installation temperatures as low as 10° F.

When used as part of the Henry® 1-2-3 Moisture Control System™, FortiFlex Butyl is backed by an industry-leading 15-year warranty. Repairs are covered for both materials and labor with a single point of contact.


  • Creped film offers exceptional stretch with minimal bunching
  • Can be installed in temperatures as low as 10° F
  • Resists UV exposure for up to one year
  • Self-seals around nails and fasteners for lasting watertightness


  • Roll Length: 50'
  • Roll Widths: 6", 9"

Related products to qualify for the 15 year warranty


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