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Owens Corning WeatherLock G Pro Grade Granulated Self-Sealing Ice & Water Barrier, 3 ft. x 66.7 ft. Roll, 200 sq. ft.
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Owens Corning WeatherLock G Pro Grade Granulated Self-Sealing Ice & Water Barrier, 3 ft. x 66.7 ft. Roll, 200 sq. ft.
This is an Owens Corning WeatherLock G Pro Grade granulated self-sealing ice and water barrier, a 3 ft. wide roll covering 200 sq. ft. (2 squares). The self-adhesive, granulated membrane creates a waterproof second line of defense under asphalt shingles, wood shakes and quarry slate. It is an essential part of the Owens Corning Total Protection Roofing System.
Key Features:
- Waterproof barrier: Helps create a waterproof barrier in vulnerable roof areas such as valleys and around penetrations.
- Self-adhesive seal: Adheres to the roof deck and seals watertight around nails to help prevent water migration.
- Granulated surface: Granulated top surface provides slip-resistant traction for safer installation.
- Split backer sheet: Split backer sheet allows easy application and positioning on the roof deck.
- Selvage edge: Selvage edge improves the seal between courses.
- Tear resistant: Resists cracking and breaking during installation.
- Full deck option: May be applied to the entire roof deck on 2:12 to 4:12 pitch roofs with proper ventilation.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Owens Corning |
| Sell unit | 1 roll, 3 ft. x 200 sq. ft. |
| Product line | WeatherLock G Pro Grade |
| Profile / style | Granulated self-sealing ice & water barrier |
| Color | Granulated |
| Dimensions | 3 ft. width; 200 sq. ft. per roll |
| Coverage per unit | 200 sq. ft. (2 squares) |
| Allowable roof pitch | 2:12 to 4:12 (full deck application) |
| Material | Self-adhesive modified membrane |
| Finish / texture | Granulated slip-resistant surface |
| Warranty | Limited Warranty (30 Year) |
| Weight | 86 lb per roll |
| Approvals | ICC-ES ESR 1783; ASTM D1970; UL Class A & C; ASTM E108/UL 790 Class A Fire Resistance (under asphalt shingles); CCMC 13403-R; Miami-Dade County Approved; Florida Product Approval; Texas Department of Insurance; CSA A123.5; LEED |
Coverage & How Much You Need:
One roll covers 200 sq. ft. (2 squares) at 3 ft. width. For full deck coverage on 2:12 to 4:12 pitches, divide roof area by 200 sq. ft.; laps and selvage edges reduce net coverage, so order slightly extra.
Fit and Compatibility:
Engineered for use under asphalt shingles, wood shakes and quarry slate, and is an essential component of the Owens Corning Total Protection Roofing System. UL Class A fire resistance applies when installed under asphalt shingles and quarry slate. Install per Owens Corning's WeatherLock G installation instructions.
Frequently Asked Questions (FAQ):
Q: How much does one roll cover?
A: One roll is 3 ft. wide and covers 200 sq. ft. (2 squares).
Q: Can it be applied over the whole roof?
A: Yes, it can be applied to the entire roof deck on 2:12 to 4:12 pitch roofs when proper ventilation is ensured.
Q: What makes it seal around nails?
A: The self-adhesive membrane adheres to the deck and forms a watertight seal around nail shanks.
Q: Is the surface slippery?
A: No, the granulated surface provides a slip-resistant surface with excellent traction.
Q: Which codes does it meet?
A: It carries ICC-ES ESR 1783, ASTM D1970, Miami-Dade County approval, Florida Product Approval, Texas Department of Insurance listing, and UL Class A fire resistance under asphalt shingles, among others.
Q: What warranty applies?
A: The item carries an Owens Corning limited warranty of 30 years as listed.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Use WeatherLock G at eaves, valleys, penetrations and other water-critical areas as a second line of defense, or over the entire deck on low-slope 2:12 to 4:12 pitches with adequate attic ventilation. Prime the deck per instructions, use the split backer for accurate positioning, and let the selvage edge overlap the next course for a continuous seal. Pair with Owens Corning shingles and system components for full Total Protection Roofing System coverage.
The granulated surface improves traction, but always wear fall protection and follow the manufacturer's installation instructions and local code when working on a roof.
Add the Owens Corning WeatherLock G Pro Grade 2-square roll to seal your roof's most vulnerable areas.
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