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WeatherMaster® Ice & Water products are self-adhesive composite underlayments. The adhesive layer is composed of a proprietary, SBS-modified asphalt reinforced with a fiberglass mat.The granule and sand surface provides excellent traction and protection from UV degradation and weathering. The self-adhesive side is covered with a split-release sheet that is removed during installation.WeatherMaster® Ice & Water provides a secondary layer of waterproofing protection needed to help prevent damage from ice dams and wind-blown rain. These self-adhering modified-bitumen underlayments create a watertight barrier by sealing to the deck and around nails to provide continuous protection year after year. WeatherMaster® Ice & Water helps protect the entire deck of a properly ventilated roof or just those problem areas where water collects or drainage is slow.
WeatherMaster® Ice & Water underlayment is self-adhesive and cold-applied. No special adhesives, heat, or equipment are necessary to install under normal dry conditions of 45°F or warmer.
Technical & Installation Details
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Get It Installed
For maximum protection and warranty coverage, install an Atlas Signature Select® Roofing System with components designed and backed by an Atlas Warranty.
1Atlas WeatherMaster®Ice & Water Underlayment
2Atlas PremiumUnderlayment
3Atlas Pro-Cut®Starter Shingles
4Atlas Roof Shingles
5Atlas Pro-Cut®Hip & Ridge Shingles
Length: 65’ Width : 36" Square Per Roll Coverage: 2
Meets ASTM D-1970
UL Classified as a Prepared Roofing Accessory Florida Building Code Approved - FL 14008 UL Class A and Class C Fire Rating Miami-Dade County Product Control Approved, Miami-Dade County, Florida
Learn and observe safe roofing practices according to OSHA and local building code requirements. Always use caution when walking on sloped roof decks and WeatherMaster® Ice & Water underlayment. Do not walk on unsecured WeatherMaster® Ice & Water or any other loose material lying on sloped roof decks. Dust, dew, water and debris create unsafe conditions on the roof. The presence of any foreign matter may drastically change the coefficient of friction (traction) on WeatherMaster® Ice & Water or any other material on a sloped roof deck. Failure to always use proper safety equipment and footwear can result in serious injury or even death.
To begin, remove any dust, dirt, loose nails or other protrusions from the roof deck. Remove all shingles, roofing felt and nails from the deck of existing roofs. Sweep thoroughly to remove any dust and dirt. Apply WeatherMaster® underlayment only in fair weather when air surface temperatures are above 45°F and rising. Apply to dry surfaces only.
Apply sheet parallel to the roof edge, extending over 1/4". Overlap edge seams 3", so that laps will shed water. End seams should be overlapped 6" and staggered. On steep slope applications it may be necessary to spot nail the top edge of the membrane temporarily during the installation process. For wrinkle-free application, cut WeatherMaster® underlayment into 10 to 15 foot lengths and reroll in reverse direction.
Peel back 1 to 2 feet of release paper. Align the sheet on the lower edge of the roof and adhere the first 1 to 2 feet. Pull the release paper from under the sheet and continue to peel it while pressing the sheet into place. Roll lower edges firmly with a wallpaper roller or other hand roller. For ice dam protection, WeatherMaster® underlayment must be applied to reach a point above the highest expected level of ice dams (minimum application at least to a height of 24" beyond the interior wall line). End laps should be overlapped 6" and staggered. When installing at temperatures below 45°F and on slopes above 8" in 12"—face nail in the overlap area at the top of the sheet at 12" OC. Priming the deck may be necessary below 45°F.
Cut WeatherMaster® underlayment into 4 to 6 foot lengths. Peel the release paper and center sheet over valley or ridge. Drape and press sheet into place, working from the center of the valley or ridge in each direction. For valleys, apply the sheet starting at the lowest point and work upward. WeatherMaster® underlayment should not be left permanently exposed to the weather. It must be covered by shingles, metal valley flashing or other roofing materials within 30 days. Overlap horizontal overlaps at least 6" in valleys.
Smooth shank galvanized nails are recommended for fastening shingles. Do not overdrive nails or break the surface.
Mechanically fasten “back nail” membrane into position until it has bonded to the roof deck to provide safe walking conditions on the roof.
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