FortiFlash® 365

High temp peel and stick flashing

FortiFlash® 365

FortiFlash® 365

FortiFlash® 365 Waterproof Flashing Membrane provides truly yearlong performance in harsh environments, including extreme heat and cold. Suitable for use with most exterior claddings, FortiFlash 365 features a metallized surface that provides an aggressive barrier to moisture intrusion.

Advanced block copolymer adhesive technology means FortiFlash® 365 will stick in extreme cold temperatures in which ordinary adhesives fail. Excellent performance at high temperatures makes it the ideal flashing any time of the year. Because it can withstand UV radiation for a full year, it is an unparalleled choice for projects facing extended UV exposure.

Part of the Fortifiber® 1-2-3 moisture control system, FortiFlash® 365 is designed to withstand the rigors of the jobsite and the elements, and is backed by an industry-leading 15-year warranty.


  • Maximum water and leak protection
  • Self-adhesive installation
  • Excellent low temperature adhesion
  • Self-seals around fasteners
  • AAMA 711 compliant
  • Part of a Complete Moisture Control System
  • For best results, use with Moistop® Sealant


  • 4" x 75'
  • 6" x 75'
  • 9" x 75'
  • 12" x 75'


  • Data Sheets

    FortiFlash® 365 Data Sheet Click to download  

    FortiFlash® 365 Safety Data Sheet Click to download  

  • Install Guides

    High Performance System Click to download

    Window Flashing Install Guide for Method A Click to download

    Window Flashing Install Guide for Method A-1 Click to download

    Arched Window Flashing Click to download

    Wood Window Sill Pan Flashing Click to download

    Recessed Window Click to download

    Flashing Installation Guide Package Click to download

  • Warranties

    15 Year Warranty Click to download

    Standard Warranty Click to download