DuPont™ FlexWrap™ NF

Building Solutions | DuPont™ FlexWrap™ NF
Commercial | Residential | Multifamily | Wall

A fastener-free way to prevent water intrusion

A self-adhering butyl flashing that integrates with DuPont air and water barriers, FlexWrap™ NF is a one-step solution for keeping water from seeping through window and door sills.


FlexWrap™ NF

DuPont™ FlexWrap™ NF self-adhered flashing does not require mechanical fasteners, even in flexed corner areas around building openings. This allows it to provide easy, one-step insulation for hard-to-seal corners around windows and doors. FlexWrap™ NF is designed to help protect vulnerable corners against air and water intrusion, as part of a complete DuPont Building Envelope Solution. It’s effective across a range of window and door designs and a wide range of typical wall substrates, including OSB, plywood, gypsum, concrete masonry unit (CMU) and other non-nailable sheathing materials.


Features & benefits

Feature Benefit
Helps seal the building envelope
  • Improves durability
  • Increases energy efficiency
  • 9 months of UV resistance
  • High adhesion performance
  • Offers easy one-step installation and protection
  • Performs through extreme temperatures
  • Adheres to most common building materials
  • Extendible flashing material
  • Can be stretched and wrapped
  • Cost- and time-effective
  • Water resistant
  • Keeps air and water out
  • Helps prevent water damage like wood rot, corrosion and mold

    Physical properties

    Method Unit Value
    Water Vapor Permeability ASTM E96 perm <1
    Water Penetration Resistance ASTM E331 Pa No leakage at 300 Pa
    ASTM E331 after thermal aging (0-120°F) - No leakage at 300 Pa
    Application Temperature - - Best when installed above 25°F
    Material Standard - - Class A (no primer)
    - - Level 3 Thermal Exposure (80°C/176°F for 7 days)

    Available sizes


    Thickness Dimenstions
    DuPont™ FlexWrap™ NF 64 mm (1620 microns) 6” x 75’, 9” x 75’, 9” x 15’