Henry Fortiflash Butyl Joist Guard Deck Framing

As low as $23.79

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Henry Fortiflash Butyl Joist Guard Deck Framing

FortiFlash delivers carefully engineered, lasting protection against water intrusion in the most demanding environmental conditions. It stands alone as 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. Fortiflash's strong adhesion makes it a perfect choice for sealing around common through-wall penetrations such as hose bibs, vents, electrical boxes and exterior lights. Yet, its price makes FortiFlash the price/performance solution for the most challenging construction requirements.

Reinforced by a strong cross-laminated high-density polyethylene film, FortiFlash can be installed around protrusions and into the tightest corners without delaminating or tearing. Its self-sealing rubberized asphalt core stays in place in the most punishing weather conditions.

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Henry Fortiflash Butyl Joist Guard Deck Framing

Part of the Fortifiber 1-2-3 moisture control system, FortiFlash is designed to withstand the rigors of the jobsite and the elements.


  • Maximum water and leak protection
  • Self-adhesive installation
  • Self-seals around fasteners
  • Exceeds ASTM & AAMA standards
  • Part of a complete moisture control system
  • For best results, use with Moistop sealant and liquid flashing (not included, see "Related Products")

This video shows the use of Henry Fortiflash Butyl as part of a larger window and housewrap installation.

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