Owens Corning Roofing

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WeatherLock® Mat Waterproofing Underlayment

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WeatherLock® Mat Waterproofing Underlayment provides superior roof deck protection for your home. It helps prevent damage caused by freeze/thaw cycling, wind-driven rains, and normal water flow that occurs around valleys, vents, chimneys and skylights.

Its patented mat-faced design provides a consistent surface, reducing slipping, sticking and scuffing. It is 40% lighter than competitive products, making it easier to load, carry and install.

Engineered for asphalt shingles, wood shakes, and quarry slate roof assemblies. It's an essential part of a complete roofing system.

Area 1.5 sq. roll - 150 sq. ft.
Area 1 sq. roll - 100 sq. ft.
Area 2 sq. roll - 200 sq. ft.
Thickness 42 mils.
Length 1.5 sq. roll - 50 ft.
Length 1 sq. roll - 33.3 ft.
Length 2 sq. roll - 66.7 ft.
Width 3 ft.

Applicable Standards

  • ICBO ES ER 4991
  • UBC 15B-1
  • UBC 15B-2
  • UBC 15D-1
  • UBC 15D-2
  • UL 790, Class A
  • UL 790, Class C
  • ASTM D1970
  • Miami-Dade County Approved

Documentation