WeatherLock® Flex – Flexible Self-Sealing Ice & Water Barrier


WeatherLock® Flex Flexible Self-Sealing Ice & Water Barrier provides excellent roof deck protection against water infiltration resulting from the freeze/thaw cycle, wind-driven rains and normal water flow around eaves, rakes, valleys, vents, chimneys and skylights.

Engineered for asphalt shingles, wood shakes and quarry slate roof assemblies, WeatherLock® Flex also offers:

  • High performance – Flexible and pliable poly surface and modified asphalt combine to adhere around irregular shapes, inside corners and at sharp angles, even in cold-weather applications to 40ºF
  • Added protection – Acts as a waterproof barrier in the most vulnerable sections of the roof, such as valleys and other roof penetrations, to create a second line of defense. For optimal protection, apply to entire roof deck on 2:12 to 4:12 pitch roofs***
  • Aggressive self-adhesive – Exceeds adhesion performance requirements to help prevent water migration
  • Slip-resistant surface – For excellent traction and safe installation
  • Seals tight around nails – Modified asphalt construction for a tight seal around nails to prevent water penetration
  • Contractor convenience – UV exposure up to 30 days without edge curling while continuing to provide high-performance lap seal. Split backer sheet for easy application****

WeatherLock® Flex is an essential part of the Owens Corning™ Total Protection Roofing System§.

*** Ensure proper ventilation is met when applied over the entire roof deck.
**** Full sheet peel-away backer available in the western U.S.
† All values are approximate.
†† Underlayment is tested as part of a roof assembly that includes wood decking, underlayment and shingles.
§ Excludes non–Owens Corning™ Roofing Products such as flashing, fasteners and wood decking.

LEED® is a registered trademark of U.S. Green Building Council.
Technical Documents
Data Sheet
Installation Instructions
Warranty
Roofing System Warranty
LEED® Certification – Roofing Accessories
Safety Data Sheets (SDS/MSDS)
Codes & Certifications
ASTM D1970
ASTM E108, Class A Fire Resistance††
UL 790, Class A Fire Resistance††
UL ER19380-01
Typical Values
Property2.25 sq. roll
Length75 ft. (22.8 m.)
Width3 ft. (0.9 m.)
Area225 sq. ft. (20.2 m2)
Construction
SurfaceHigh-strength cross-laminated poly surface
Adhesive StyreneModified Asphalt
Removable BackingRemovable Backing; Peel-away release liner**
ApplicationEngineered for asphalt shingles, wood shakes and quarry slate roof assemblies
*** Ensure proper ventilation is met when applied over the entire roof deck.
**** Full sheet peel-away backer available in the western U.S.
† All values are approximate.
†† Underlayment is tested as part of a roof assembly that includes wood decking, underlayment and shingles.
§ Excludes non–Owens Corning™ Roofing Products such as flashing, fasteners and wood decking.

LEED® is a registered trademark of U.S. Green Building Council.