Leak Barriers - WeatherWatch

WeatherWatch® Leak Barrier

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

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

Good Housekeeping

Weather Watch® Leak Barrier is a key part of the GAF Lifetime Roofing System, and has even earned the prestigious Good Housekeeping Seal (See Details)

Don’t Put Your Home At Risk

The Codes Are Clear...
North Area Protection against ice dams is required* 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 still occur 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!

* Check Local building codes for specifications in your area.
† Source: International Building Code (IBC) and International Residential Code (IRC).

Homeowner’s Best Choice

Looks Better...
Fiberglass reinforcement helps resist wrinkling and buckling¬—lies 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. (See Details)

† In the “North,” building codes require the use of leak barrier on their eaves.

Professional’s Best Choice

Helps Eliminate Waste...
Special adhesive allows for one-time repositioning, but aggressively adheres over time

Self-seals around nails or metal roofing fasteners

Saves Labor...
Dual-side selvedge and split-back release film helps to speed installation for greater homeowner value

1.5 and 2.0 square roll sizes

Great For Emergencies...
Can be left exposed for up to 60 days if necessary on asphalt shingle roof systems. WeatherWatch® Leak Barriers are excellent vapor retarders exceeding ASTM D1970 requirements with a .05 permanence.


GAF WeatherWatch® 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)

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)

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


All documents are U.S. English unless otherwise noted

Get Automatic Lifetime Protection On Your GAF WeatherWatch® Leak Barriers and Your Entire GAF Roofing System!

  • A Lifetime ltd. warranty... on your shingles and all qualifying GAF accessories! (See Details)
  • Non-prorated coverage for the first 10 years (See Details)

Professional Installation

GAF Roof Wizard
Virtual Home Remodeler

Product Pricing and Where to Buy