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WeatherMaster® Flexible Ice & Water is a film-faced, high-temperature roof underlayment suitable for use under any type of roofing material.
The plastic film surface of WeatherMaster® Flexible Ice & Water self-adhesive underlayment provides skid resistance, allowing for better traction and safer installation. An SBS-modified, self-adhesive coating creates a watertight seal around nails. Because of its flexibility, WeatherMaster® Flexible Ice & Water is ideal for critical area protection, such as eaves, rakes and valleys.
The versatility of WeatherMaster® Flexible Ice & Water makes it an ideal underlayment for any type of roof.
Technical & Installation Details
Where To Buy
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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: 66.8’ Width : 36" Square Per Roll Coverage: 2
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
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® Flexible Ice & Water underlayment. Do not walk on unsecured WeatherMaster® Flexible 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® Flexible 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.
WeatherMaster® Flexible Ice & Water should be installed only when ambient and substrate temperatures are 45°F (7.2°C) or higher. Prime wood or metal surfaces at temperatures below 45°F. Remove all dirt, dust, loose nails and debris prior to installing WeatherMaster® Flexible Ice & Water. Decking must be dry.
When WeatherMaster® Flexible Ice & Water is to be adhered to any metal surfaces, priming with asphalt primer meeting ASTM D 41 is recommended.
WeatherMaster® Flexible Ice & Water underlayment shall be applied to dry surfaces during fair weather when air surface temperatures are above 45°F. In temperatures below 45°F, deck surfaces will need to be primed prior to application. Before getting started, be sure the roof deck is free of dust, dirt, loose nails, and any other protrusions.
Begin by cutting WeatherMaster® Flexible Ice & Water into 10 to 15 foot lengths and re-roll for wrinkle-free application. Apply sheet parallel to the roof edge, extending over 1/4". Overlap edge seams 3" minimum, so that laps will shed water. On steep slope applications, it may be necessary to nail the top edge of the membrane temporarily during the installation process. For ice dam protection, underlayment must be applied to a point at least 24" beyond interior wall line or above the expected level of ice dams.
Peel back one to two feet of release paper. Before peeling further, align the sheet on the lower edge of the roof and adhere the areas you have peeled. Pull the release paper from under the sheet and slowly continue to peel, pressing the sheet into place as you go. Use a hand roller to firmly roll lower edges. End laps should be overlapped 6" and staggered. When installing at temperatures below 45°F and on slopes above 8 in 12, face-nail the top overlap at 12" OC.
Cut WeatherMaster® Flexible Ice & Water 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. Horizontal overlaps should be at least 6" in valleys.
WeatherMaster® Flexible Ice & Water 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. Galvanized roofing nails are recommended for fastening WeatherMaster® Flexible Ice & Water. Do not overdrive nails or break the surface.
When used as flashing tape, cut tape to manageable 8 to 12 foot lengths, center the tape over the roof deck panel joints and roll into position. In temperatures below 45° F deck panels will need to be primed prior to tape application.
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