WeatherMaster® SE Granular Surfaced Peel & Stick SBS Reinforced Underlayment

Atlas WeatherMaster® Granular SE is a reinforced Peel and Stick underlayment designed for maximum ice and water protection under any roofing material. This composite underlayment is self-adhering and reinforced with a fiberglass mat.

With SBS technology, WeatherMaster® Granular SE helps protect the entire deck of a properly ventilated roof, especially problem areas where water collects or drainage can be slow. It provides a secondary layer of waterproofing protection to help prevent damage from ice dams and wind-driven rain.

Its surface of opaque granules provides excellent traction plus protection from UV degradation and weathering. This self-adhering modified bitumen underlayment creates a watertight barrier by sealing to the deck and also around nails to provide continuous protection year after year.

Among the numerous benefits of WeatherMaster® Granular SE is a UV Protected Surface that can withstand a 45-day exposure. It is 55 Mil Thick, 38 percent above industry requirements and has a self-adhesive backing that seals directly to the roof deck. With dual modified asphalt this Peel and Stick underlayment provides superior granular adhesion for better traction. It remains stable in temperatures as high as 240°F. Its fiberglass mat provides better tear resistance than saturated felt.

An Atlas Roofing representative can fully detail Atlas WeatherMaster® Granular SE. Reach out to your Atlas representative today to find out how you can unroll the protection of Atlas SBS Peel and Stick underlayment on your roof. Whatever your peel and stick underlayment needs are, Atlas Roofing has you covered.

WeatherMaster Granular SE peel and stick underlayment

Benefits

  • UV Protected Surface – 45 Day Exposure
  • High Temperature Stability – 240°F
  • Self-Adhesive Backing Seals Directly To The Deck
  • 55 Mil Thick, 38% Above Industry Requirement
  • Dual Modified Asphalt Provides Superior Granular Adhesion
  • Increased Granule Adhesion For Better Traction
  • Fiberglass Mat Provides Better Tear Resistance Than Saturated Felt

SPECIAL INSTRUCTIONS

Granular SE 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 Granular SE. Decking must be dry.

When Granular SE is to be adhered to any metal surfaces, priming with asphalt primer meeting ASTM D 41 is recommended.

GENERAL INSTRUCTIONS

For Roof Decks (Rakes and Eaves):

WeatherMaster® Granular SE 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® Granular SE 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.



For Valleys and Ridges:

Cut WeatherMaster® Granular SE 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® Granular SE 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® Granular SE. Do not overdrive nails or break the surface.

Granular SE Flashing Tape

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.

Safety, Storage, and Handling

Pallets of WeatherMaster® Granular SE underlayment shall not be triple stacked. Provide a weather cover on top and sides, allowing for adequate ventilation. Consult the Material Safety Data Sheet for best available information on safe handling, storage, personal protection, health and environmental considerations.

CAUTION: Do not walk on surfaces unless it is completely dry. Always learn and observe proper safety practices according to OSHA and local building code requirements.