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Fortifiber FortiFlash 12" x 75' 40 Mil Waterproof Flashing Membrane 3/Box

Brand: Fortifiber Mfg#: M706040
Product#: 278FF4012
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FortiFlash® is engineered to deliver lasting protection against water intrusion in the most demanding environmental conditions. It is the premium self-adhesive waterproof flashing membrane for windows. It is also ideally suited for flashing non-roofing horizontal conditions such as pot shelves, parapets, sill pans and recessed windows. Its strong adhesion makes it a perfect choice for sealing around common through-wall penetrations such as hose bibs, vents, electrical boxes and exterior lights.


  • Waterproof flashing membrane
  • Self-sealing core part of complete moisture control system
  • Self-adhesive installation
  • Protects against water intrusion in horizontal applications such as pot shelves, parapets and recessed windows maximum water and leak protection Self-adhesive installation


  • Brand: Fortifiber
  • Product Line: FortiFlash®
  • Material: Polyethylene
  • Thickness: 40 mil
  • Lap Adhesion: 10 lb/in
  • Color: White
  • Type: Premium, Self-Adhesive
  • Temperature Rating: 40 - 120 deg F Application, -40 TO 158 deg F Service
  • Standards: AAMA Specified, ASTM D146/D412/D779/D903/E96/E154
  • Tensile Strength: 71 ASTM D-828 MD, 42 ASTM D-828 CD
  • Length: 75 ft
  • Width: 12 in
  • Usage: Used to Protect Against Water Intrusion In Horizontal Applications Such As Pot Shelves, Parapets, And Recessed Windows.