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225 sq. ft. WeatherLock Flex Flexible Self-Sealing Ice and Water Shield Leak Barrier

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  • Flexible ice and water shield for vulnerable sections of roof
  • Slip-resistant surface for great traction and safe installation
  • Strong self-adhesive barrier and seals tightly around nails
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Product Details

Owens Corning roof beauty shot

Protection Made Simple

Owens Corning created the Total Protection Roofing System to make it simple to get everything you need in one complete system.

Owens Corning Total Protection Roofing System roof diagram

Total Protection Simplified

The Total Protection Roofing System gives assurance that all the roofing components are working together to help increase the performance of the roof–and enhance the comfort for those who live beneath it.

Image of roof layers calling attention to ProArmor synthetic underlayment and Weatherlock ice and water barrier

SEAL. Roofing Components

Powerful two-part protection helps keep moisture away from the roof deck by creating a barrier against ice and water infiltration.

Man installing ice and water barrier

A Waterproof Barrier for Vulnerable Areas

Helps protect the roof where water has a tendency to collect or flow, including valleys, eaves, chimneys and skylights.

close up of WeatherLock Ice and Water barrier

Exceeds Adhesion Performance Requirements

Helps prevent damage associated with shingle blow-off, wind-driven rain and ice damming.

Image of man rolling our Owens Corning ProArmor Synthetic Underlayment

The New Standard for Deck Protection

Provides a water shedding barrier under shingles as the last line of defense for the roof.

Close up of roll of Owens Corning ProArmor Synthetic Underlayment

Strong, Durable and Repels Water

ProArmor Synthetic Roof Underlayment helps guard against damage from wind-driven rain.

Close up of Owens Corning WeatherLock Ice and Water barrier

Creates A Waterproof Barrier

Helps prevent damage associated with shingle blow-off, wind-driven rain and ice damming.

Close up of Owens Corning ProArmor Synthetic Underlayment

Create a Last Line of Defense

Create a water shedding barrier under shingles with the protection of synthetic underlayment.

Image of man installing Owens Corning Starter Strip at eaves

Helps Protect Against Nature’s Elements

Starter shingles ensure a straight edge and effective seal along the eaves and rake–areas that are vulnerable to high winds.

image of hip and ridge shingles on the roof ridge line

Protection to Vulnerable Areas

Add style and extra protection with starter and hip and ridge shingles designed to match.

Ventilation at the ridge line on a roof

Balanced Ventilation

Install proper roof and attic ventilation to create balance throughout the home.

man measuring AttiCat loosefill insulation in an attic

Optimize Performance

Optimize value, comfort and performance by adding attic insulation.

WeatherLock Flex Self-Sealing Ice and Water Barrier provides excellent protection against water infiltration resulting from freeze/thaw cycles wind driven rains and normal water flow around eaves, valleys, vents, chimneys and skylights. Plus it can be applied over existing poly surface ice and water barriers so re-roofing is easy and less costly. For optimal protection, apply to entire roof deck on 2:12 to 4:12 pitch roofs. Ensure proper ventilation is met when applied over the entire roof deck.
  • High performance-flexible and pliable poly surface
  • Aggressive self-adhesive helps prevents water migration
  • Slip-resistant surface for excellent traction and safe installation
  • Seals tight around nails
  • UV exposure up to 30 days
  • Weatherlock G does not replace the starter shingle strip. Owens Corning Starter Shingle Roll can be installed over Weatherlock Leak Barrier products.
  • WeatherLock Specialty Tile and Metal Self-Sealing Waterproofing Underlayment should be used with a metal roof.
  • Shop Owens Corning Total Protection Roofing System
  • Step 1: seal - Ice and water barrier and underlayment properly seals your roof and helps prevent rot and mold
  • Step 2: defend - Owens Corning roofing shingles add a tough, yet beautiful layer of defense with strong adhesion that resists blow offs and helps shed water away
  • Step 3: breathe - proper ventilation reduces heat and moisture buildup to prevent ice damming, roof deterioration and mold infestation
  • Step 4: comfort - add comfort and energy performance with proper attic insulation
  • In order to meet the requirements for the Total Protection Roofing System Limited Warranty, Owens Corning shingles, Owens Corning Hip & Ridges shingles and two additional Owens Corning roofing accessories must be installed.
  • Click Drip Edge Flashing to view our assortment, if applicable to your project.
  • Click Lumber or Plywood to see our assortment, if applicable for your project.
  • For an extra seal, check out our Roof Cement page for additional products.
  • Return Policy
  • California residents

Additional Resources

From the Manufacturer




Coverage Area (sq. ft.)225 sq ftProduct Thickness (in.).048 in
Product Width (in.)36 inUnrolled length (ft.)75


Application MethodPeel & Stick, Self AdheredColor FamilyBlack
FeaturesWaterproofFire Rating (UL 790)Class A
MaterialAsphaltProduct Weight (lb.)71.5 lb
Returnable90-DayRoofing Product TypeUnderlayment
Squares (100sq. Ft)/Roll2.25Surface RecommendedWood
TextureSmoothUnderlayment/Barrier TypeLeak Barrier

Warranty / Certifications

Manufacturer WarrantyN/A

Questions & Answers

Q:Can this be placed on top of synthetic underlayment before the addition of shingles?
by|Sep 7, 2022
2 Answers
Answer This Question

A:  NO, this is meant to go UNDER the roofing underlayment! It is for the purpose of dealing with ice and protecting the 3' of roof edge BEFORE the roofing underlayment goes on. It is also "self-sticking" to the bare decking material.

by|Sep 7, 2022

    A:  Hello Anthony, WeatherLock product should be installed directly to the wood deck, roofing underlayment should not be installed beneath the product. Thank you for your inquiry!

    by|Sep 7, 2022
      Q:Can this be used under a steel roof?
      by|Jan 17, 2022
      1 Answer
      Answer This Question

      A:  Hello Curious, Owens Corning WeatherLock Flex is engineered for asphalt shingles, wood shakes and quarry slate roof assemblies. It is not designed or tested for use under steel roofs. Thank you for your inquiry!

      by|Mar 28, 2022
        1 found this answer helpful
        Q:How long can the product be exposed to the weather before shingles are applied? I will be doing a 700 sf roof solo so it will take some time
        by|Feb 27, 2021
        2 Answers
        Answer This Question

        A:  Mine was exposed for 3-4 months with no signs of degrading. Seems to be working fine so far.

        by|Feb 27, 2021

        A:  Hello Joe, Owens Corning WeatherLock Flex should not be left exposed for more than 30 day. Prolonged exposure to wind, sun and weather will adversely affect this products installation and performance. Thank you for your inquiry!

        by|Mar 1, 2021
          Q:Will this product adhere to FOAMULAR 150 Extruded Polystyrene (XPS) Rigid Foam Insulation???
          by|Jul 24, 2020
          2 Answers
          Answer This Question

          A:  Yes it will. But I did not use the foam on my roof.

          by|Dec 14, 2021

            A:  Hello Kent, we do not have recommendations for installing WeatherLock Flex directly to Foamular. Thank you for your inquiry!

            by|Jul 28, 2020
              Showing 1-4 of 34

              Customer Reviews

              4.6 out of 5
              • 4.6
                out of 28 reviews
              • 67% recommend this product
              Filter by:
              Showing 1-10 of 28 reviews
              • Verified Purchase
              This stuff is awesome a bit tricky to install but...
              This stuff is awesome a bit tricky to install but we got the hang of it
              • Verified Purchase
              High quality product. Difficult installation.
              Once the product is installed, it appears to be very high quality. My only issue is the difficulty of installation. The product sticks like mad, so be very careful to get it where you want it the first time. Unlike other ice and water barriers I have used, the backing material is one solid piece instead of two halves, which I do not like as well. Lastly, if the product sits on the roof in the sun for even a short period of time, the backing material becomes extremely difficult to get off.
                • Recommended
                1 found this review helpful
                • Verified Purchase
                Rating provided by a verified purchaser...
                Rating provided by a verified purchaser
                    Absolutely great stuff. I have it on the outside roof...
                    Absolutely great stuff. I have it on the outside roof exposed to weather and sunlight and it is great going into the third winter . . . and I use it under carpet instead of vinyl and I can put it down cheaply.
                      Product is very good once down. Unfortunately product was difficult...
                      Product is very good once down. Unfortunately product was difficult to lay by not being able to lay half at a time like other brands. and paper backing sometimes stuck to ice shield. I would choose a different brand next time only because of this.
                      • Verified Purchase
                      recommended it to all my customers very easy to put...
                      recommended it to all my customers very easy to put down. I will definitely get it a five-star.
                      • Verified Purchase
                      • Verified Purchase
                      Showing 1-10 of 28 reviews

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