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General Instructions
For Roof Decks (Rakes and Eaves)
To begin, remove any dust, dirt, loose nails or other protrusions from the deck of new roofs. Remove all shingles, roofing felt and nails from the deck of existing roofs. Sweep thoroughly to remove any dust and dirt. Apply AC TileSeal Underlayment only in fair weather when air surface temperatures are above 45°F. Apply sheet parallel and flush to the eave edge. Overlap horizontal laps 4" so that laps will shed water. End laps 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 AC TileSeal Underlayment into 10- to 15-foot lengths and reroll. Peel back 1 to 2 feet of release paper. Align the sheet on the lower eave 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, AC TileSeal 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). Apply asphalt cement in a 1" line top to bottom on all overlaps.
For Valleys and Ridges
Cut AC TileSeal 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. Overlap all laps a minimum of 6 inches. AC TileSeal Underlayment should not be left permanently exposed to the weather. It must be covered
by shingles, metal valley flashing or other roofing materials within 180 days of installation. Place metal drip edge AC TileSeal Underlayment. Smooth shank galvanized nails are recommended for fastening shingles. Do not overdrive nails.
Application
- The deck must be clean, dry and free from loose materials and contaminants. WeatherMasterTM AC TileSeal should be installed when ambient and substrate temperatures are 45°F (4.4°C) or higher.
- Some codes require an additional base sheet course under WeatherMasterTM AC TileSeal. Check your local building codes and use a base sheet that meets ASTM D 226, Type II, ASTM D 4869 Type IV or ASTM D2626 if one is required. Apply the base sheet parallel to and abutting the eave. Apply the metal drip edge over the deck eave edge and nail 9” on center. End laps should be 6” and side laps a minimum of 4”. Mechanically fasten the base sheet to deck with approved nails, staples or cap nails 6” on center at the laps and two staggered rows 12” on center in the field of the roll. Cover entire roof with the base sheet. Coat the top of the drip edge with a 2” wide troweling of modified bitumen adhesive.
- If an additional course is not used under WeatherMasterTM AC TileSeal, place the metal drip edge directly on the deck and seal the leading edge as described above.
- Install WeatherMasterTM AC TileSeal in all valleys. Follow the National Tile Roofing Association Sealed System guidelines with the added step of nailing 9” on center, 1” in from edge on all end laps.
- Once WeatherMasterTM AC TileSeal has been installed in the valley, apply WeatherMasterTM AC TileSeal to the main roof, starting at the eave. The first course of WeatherMasterTM AC TileSeal should be parallel to and abutting the eave.
- All metal flanges shall be primed with asphalt primer prior to installation of WeatherMasterTM AC TileSeal.
- For steep slope roofs (above 7” in 12”), secure WeatherMasterTM AC TileSeal with either nails, staples or cap nails, placed 6” (150mm) on center only in the black selvedge and overlap areas.
- Overlap each succeeding course 3” (75mm) and 6” (150mm) on the endlaps.
- When applying any WeatherMaster roofing underlayment, proper roof deck ventilation is required.
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