WeatherLock® Mat Self-Sealing Ice & Water Barrier

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WeatherLock® Mat Self-Sealing Ice & Water Barrier is designed to act as a secondary water barrier under shingles, wood shakes and quarry slate roofs. It helps prevent damage due to shingles being blown off, as well as wind-driven rain – which can get under shingles – and ice damming.

It also:

  • Acts as another line of defense when used on the entire roof deck, part of best practices for roof deck coverage on 2:12 to 4:12 pitch roofs*
  • Is effective at reducing slipping, sticking and scuffing – thanks to a patented roughened surface
  • Is lighter weight than typical granulated products, making it easy to load, carry and install

WeatherLock® Mat Self-Sealing Ice & Water Barrier is an essential part of the Owens Corning™ Total Protection Roofing System§. 

* Ensure proper ventilation is met when applied over the entire roof deck.
† 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
MSDS
Applicable Standards
ASTM D1970
ASTM E108, Class A Fire Resistance††
UL 790, Class A Fire Resistance††
ICC-ESR 1783
CCMC 13403-R
Typical Values†
PropertyModel: 1 sq. roll Model: 2 sq. roll 
Length33.3 ft. (10.2 m.)66.7 ft. (21.3 m.)
Width 3 ft. (0.9 m.) 3 ft. (0.9 m.)
Area100 sq. ft. (9.3 m2)  200 sq. ft. (19.4 m2)                   
Physical Properties†
Slip ResistancePassed
PliabilityPassed
Tensile Strength 
Longitudinal (md)48 lb./in.
Transverse (cd)35 lb./in.
Elongation at Break250%
(modified bitumen portion) 
Permeance.05 max
Adheasion to Plywood, 40ºF1.0 lb./in
Adheasion to Plywood, 75ºF4.2 lb./in.
Tear Resistance 
Longitudinal90 lb.
Transverse90 lb
Sealability around NailPassed
Waterproofing Integrity after Low Temperature FlexPassed
Waterproofing Integrity of LapPassed
Construction
SurfacePolymeric Coating
Interior ReinforcementDurable fiber glass mat
Adhesive StyreneModified asphalt
Removable Backing Split-sheet peel-away poly backerSplit-sheet peel-away poly backer
ApplicationEngineered for asphalt shingles, wood shakes and quarry slate roof assemblies

* Ensure proper ventilation is met when applied over the entire roof deck.
† 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.