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WeatherMaster® Ice & Water 100 is a composite roof underlayment designed to provide a secondary waterproofing barrier needed to prevent ice dams and damage caused by wind-blown rain.
A proprietary fiberglass mat reinforced, SBS-modified asphalt makes WeatherMaster® Ice & Water 100 ideally suited for continuous waterproofing protection against ice dams and wind-blown rain year after year. The self-adhesive underlayment creates a watertight barrier by sealing to the roof deck and around nails. WeatherMaster® Ice & Water 100 provides excellent traction and protection from UV degradation and weathering thanks to its granule surface.
WeatherMaster® Ice & Water 100 provides an extra layer of waterproofing protection and peace of mind when the weather gets rough.
Technical & Installation Details
Where To Buy
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
3Atlas Pro-Cut®Starter Shingles
4Atlas Roof Shingles
5Atlas Pro-Cut®Hip & Ridge Shingles
Length: 33.3’ Width : 36" Square Per Roll: 1
Meets ASTM D-1970, Standard Ice Dam Underlayment
UL Classified as a Prepared Roofing Accessory Florida Building Code Approved - FL 17322 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 100 underlayment. Do not walk on unsecured WeatherMaster® Ice & Water 100 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 100 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® Ice & Water 100 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® Ice & Water 100 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® Ice & Water 100 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® Ice & Water 100 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® Ice & Water 100 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.
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