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Owens Corning WeatherLock Mat Ice & Water Barrier

- Available in 2 Options. Pricing may vary.

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Product Information


The Owens Corning WeatherLock Mat Ice & Water Barrier is designed to act as a secondary water and ice barrier under shingles, wood shakes, and quarry slate roofs. The WeatherLock creates a water resistant seam at the corners and valleys on the roof. It helps prevent damage due ice dams and resists cracking and breaking during installation. The WeatherLock Granulated Self-Sealing Ice & Water Barrier provides a waterproof barrier, creating a watertight seal over nails and gaps. Do not allow WeatherLock underlayment to remain uncovered more than 30 days.


  • Lighter weight than typical granulated products, making it easy to load, carry and install
  • Effective at reducing slipping, sticking and scuffing – thanks to a patented roughened surface
  • Made of a Polymeric Coating surface
  • Interior Reinforcement: Durable fiber glass mat
  • Adhesive Styrene: Modified asphalt
  • Prevents ice dams and water penetration into roof
  • Self-Sealing for easy application

Applicable Standards

  • ASTM D1970
  • ASTM E108, Class A Fire Resistance and UL 790, Class A Fire Resistance (underlayment is tested as part of a roof assembly that includes wood decking, underlayment, and shingles
  • ICC-ESR 1783
  • CCMC 13403-R


  • Coverage: 2 square roll
  • Area: 200 square ft.
  • Length: 66.7 ft. (21.3 m)
  • Width: 3 ft.
  • Weight of the Roll: 59 lbs

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