Leak Barriers - StormFlash

StormFlash™ Self-Adhering Flashing - Air & Moisture Barrier

Protect Your Windows and Doors From Wind-Driven Rain With A Waterproof Leak Barrier

Self-Adhering Flashing - Air & Moisture Barrier Will:

  • Stop wasting energy by sealing around window and door openings, rooftop penetrations, and roof deck joints
  • Eliminate leaks caused by wind-driven rain, ice, and snow build-up
  • Stop cold drafts

Some leaks aren’t detected until serious damage occurs. Protecting the vulnerable areas of your home with the installation of window and door flashing will help avoid the costly effects of dry rot, decay, and mildew.

Good Housekeeping

StormFlash™ self-adhering flashing has earned the prestigious Good Housekeeping Seal, which means that Good Housekeeping stands behind this product. (Refer to Good Housekeeping Magazine for its consumer protection policy.)

Homeowner’s Best Choice

  • Reliable...

    Fiberglass reinforced for strength and durability

  • Saves Money...

    Eliminates drafts and saves on heating and cooling cost

  • Peace Of Mind...

    Backed by GAF, covered by a 10-year Limited Warranty (See Details)


Professional’s Best Choice

  • Helps Eliminate Waste...

    Special adhesive allows for one-time repositioning, but adheres aggressively over time

  • Saves Time...

    4", 6", and 9" rolls eliminate the need to cut traditional leak barriers when flashing smaller, vulnerable areas

  • Great For Emergencies...

    Can be left exposed for up to 30 days if necessary

  • Dependable...

    Seals around nails


GAF StormFlash™ Flashing – Air & Moisture Barrier Meets the Following Min. Requirements
of ASTM D1970

Property Method Requirement
Thickness (mils) D5147 Min. 40
Tensile strength MD (lbf/in) D2523 Min. 25
Tensile strength CMD (lbf/in) D2523 Min. 25
Elongation at break, modified bitumen; Portion – MD and CMD (%) D2523 Min. 10
Adhesion to plywood at 75°F (lbf/ft-width) D903 Min. 12
Adhesion to plywood at 40°F (lbf/ft-width) D903 Min. 2
Thermal stability (mm) D1204 Max. 3
Low temperature flexibility (–20°F) D1970 Pass
Tear resistance MD (lbf) D4073 Min. 20
Tear resistance CMD (lbf) D4073 Min. 20
Moisture vapor permeance (U.S. Perms) E96 A Min 0.1
Sealability around nail D1970 Pass
Waterproof integrity after low temperature flexibility D1970 Pass
Waterproof integrity of lap seam D1970 Pass

Product Specifications (Nominal)

Roll Length & Width Weight Per Roll Rolls Per Box
4" x 36' (10.2cm x 10.9m) 2.7 lbs (1.2 kg) (12 rolls per box)
4" x 75' (10.2cm x 22.8m) 5.3 lbs (2.4 kg) (9 rolls per box)
6" x 36' (15cm x 10.9m) 4.1 lbs (1.9 kg) (8 rolls per box)
6" x 75' (15.2cm x 22.8m 8 lbs (3.6 kg) (6 rolls per box)
9" x 36' (22.9cm x 10.9m) 6.2 lbs (2.8 kg) (4 rolls per box)

Applicable Standards

  • Meets the performance criteria of ASTM D1970
  • State of Florida Approved FL10626-R8
  • Miami-Dade County Product Control Approved
  • Good Housekeeping Seal of Approval
  • UL Classified. See complete marking on product.

Note: When sealing deck joints in a roofing application, it is particularly important to be sure that the roof assembly/attic is properly ventilated.


All documents are U.S. English unless otherwise noted

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