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§. 

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)                   

* 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.

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
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
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.