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Validated Products
  • Listee
    • Owens Corning
  • Manufacturer Location
    • Brentwood, NH
    • Houston, TX
  • Category
    • Roofing Material
  • SubCategory
    • Underlayment
  • Certification(s)
    • ASTM D1970
    • ASTM E108 Class A

WeatherLock Mat

WeatherLock Mat is a polymer modified bituminous sheet material intended for use as underlayment. Underlayment is manufactured as a fiberglass mat surface impregnated and coated with a self-adhering modified asphalt. Underlayment rolls have approximate dimensions of 66.7ft x 3ft. Underlayment is self-adhered.


ASTM D1970
Product has met specification requirements of ASTM D1970.

ASTM E108 (Fire)
Product has met Class A requirements of ASTM E108 when installed over minimum 15/32in thick APA-rated plywood decks with allowable roof covers of asphalt shingles (ASTM D3462) or slate shingles (ASTM C406). Slope is unlimited.