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Weather Watch® Leak Barrier

Protect Your Home From Wind-Driven Rain And Damaging Ice Dams With A Waterproof Leak Barrier

IMPORTANT NOTE: The product Information Sheet for Weather Watch®  Leak Barrier with a print date of 10/07 listed the incorrect information that Weather Watch Leak Barrier was made with a “high temperature compound” and was “suitable for use with most metal roof applications”. This product is not made with a high temperature compound and it is not suitable for use under any metal roof. The incorrect information was listed on the web site from October 15th -18th  2007 and distributed in hard copy form, October 1st – October 18th  2007. A Quality Leak Barrier Will:
Create a 100% watertight seal that keeps water out at the most vulnerable areas of your roof (at the eaves and rakes, in valleys, around chimneys, etc.).

Weather Watch®, a quality leak barrier, will:
  • Protect your home by preventing costly repairs due to wall or ceiling staining
  • Help prevent leaks due to water damming in your gutters, wind-driven rain, and, in the North, damaging ice dams

Weather Watch® Mineral-Surfaced Leak Barrier is a key part of the GAF Lifetime Roofing System, and has even earned the prestigious Good Housekeeping Seal.

Don’t Put Your Home At Risk
  • The Codes Are Clear...
    North AreaProtection against ice dams isrequired at eaves wherever the January average temperature is 25°F or lower or where there is a possibility of ice forming in the eaves - i.e., the area labeled "North". 
  • But Be Prepared...
    Ice dams can still occur in areas where the average temperature is above 25°F (not to mention wind-driven rain) 
  • Avoid The Risks...
    If you are in an area that requires leak barrier protection – and if there is a leak – you could be putting your insurance coverage at risk by not installing it!
Homeowner’s Best Choice
  • Looks Better...
    Fiberglass reinforcement helps resist wrinkling and buckling – lays flatter under shingles 
  • Meets Building Codes...
    In the North, where a leak barrier MUST be used
  • Peace Of Mind...
    Up to a Lifetime ltd. warranty when used on Lifetime Shingle roofs, up to a 25-year ltd. warranty when used on non-Lifetime Shingle roofs.
Professional’s Best Choice
  • Helps Eliminate Waste...
    Special adhesive allows for one-time repositioning, but aggressively adheres over time 
  • Dependable...
    Self-seals around nails or metal roofing fasteners 
  • Saves Labor...
    Dual-side selvedge and split-back release film speed installation for greater homeowner value 
  • Convenient...
    1.5 and 2.0 square roll sizes
  • Great For Emergencies...
    Can be left exposed for up to 60 days if necessary


GAF Weather Watch ® Leak Barrier EXCEEDS the following 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 Max 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)

Applicable Standards
  • ICC-ES Evaluation Report (ESR 1322)
  • Meets the performance criteria of ASTM D1970
  • Miami-Dade County Approved
  • State of Florida Approved
  • UL Classified. See complete marking on product
Specification 1.5 Square Roll 2.0 Square Roll
Roll length 50 ft (15.2 m) 66.7 ft (20.3 m)
Roll width 36 in (0.9 m) 36 in (0.9m)
Sq. feet per roll 150 sq ft (13.9 sq m) 200 sq ft (18.6 sq m)