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Designer Tool

See how your GAF roof will look on your home before you purchase..!!

Easy to use! Choose a similar house, add your siding product,  select different colors, and styles.



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Weather Watch® XT

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.).

Good Housekeeping Weather Watch® XT, 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® XT Mat-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 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 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 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, and up to a 12-year ltd. warranty when used with other approved roof membranes. 
Professional’s Best Choice
  • Dependable...
    Self-seals around nails or metal roofing fasteners 
  • Safer...
    Specially coated surface with added tack for extra traction under foot 
  • Saves Labor...
    Dual-side selvage and split-back release film speed installation for greater homeowner value 
  • Convenient...
    2.0 square roll size 
  • Great For Emergencies...
    Can be left exposed for up to 60 days (steep-slope applications only) if necessary 
  • Versatile...
    Weather Watch® Leak Barriers are excellent vapor retarders exceeding ASTM D1970 requirements with a .05* vapor permeance (*Based on internal testing)


GAF Weather Watch® XT 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 pending
  • Meets the performance criteria of ASTM D1970
  • UL Classified. See complete marking on product
  • Florida Building Code approved
  • Miami-Dade County Approved
Specification 2.0 Square Roll
Roll length 66.7 ft (20.3 m)
Roll width 36 in (0.9m)
Sq. feet per roll 200 sq ft (18.6 sq m)

Precautionary Note: Due to the added tack in Weather Watch® XT, asphaltic residue may be tracked over exposed surface. Protect walking surfaces to avoid staining, especially in hot weather.
Note: See application instructions for complete information.