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6. Stagger joints of gypsum overlayment/overlayment insulation one (1') foot <br />(vertically and laterally) to ensure that joints do not coincide with joints from the <br />previous or adjacent layer. <br />7. Crickets, saddles and tapered edge strips shall be installed before the overlayment <br />insulation. <br />8. Adhere cant strips and tapered edge strips at transitions, terminations and/or <br />penetrations as detailed or required in ribbons of foam adhesive or a full mopping <br />of hot asphalt to ensure smooth transitions are provided for the roof membrane and <br />flashings. <br />9. Provide necessary modifications to insulation system or nailers at roof edges as <br />required to ensure a flush and smooth transition is provided for the roof membrane <br />and flashing. <br />10. Field modifications of insulation, tapered edge strips and cants shall be made by <br />the Contractor where required to accommodate roof and flashing conditions, <br />prevent water dams and ponding water. Ponding water at scuppers and cricket <br />valleys shall not be accepted. <br />11. Provide necessary modifications to prevent standing water which is defined as 1/4" <br />of water in a 4 -square foot or larger area 24 hours or more after precipitation. <br />B. Self -Adhered Vapor Retarder <br />1. Install in accordance with manufacturer's recommendations. <br />2. Primer Application: The substrate must be clean, dry and free of dust, grease or <br />other contaminants. Shake well before using. Apply to clean and dry surfaces <br />with a paint brush, roller or sprayer. Application rates will vary depending on <br />substrate. Vapor retarder must be installed on the same day as the primer <br />application. Acceptable substrates for primer application include wood, concrete, <br />gypsum boards and decks. Allow primer to dry completely. <br />3. Vapor Retarder Application Over Steel, Wood or Concrete Deck: Install over a <br />clean and dry substrate. In concrete applications allow concrete to cure for at least <br />7 days. Do not install when it is raining, snowing, or on wet/humid surfaces. <br />Install in temperatures 32 -degree F (0 degree C) and above. The use of a primer <br />is required on the following substrates: wood, concrete, lightweight concrete, <br />gypsum boards and decks. On metal decks use a metal plate (6 x 42 inches - 15 x <br />106 cm) to support the membrane end lap between metal flutes ensuring a complete <br />end lap seal. <br />a. Begin application at the bottom of the slope. Unroll vapor retarder onto <br />the substrate without adhering for alignment. Overlap each preceding <br />sheet by 3 inches (75 mm) lengthwise following the reference line and by <br />6 inches (150 mm) at each end. Stagger end laps by at least 12 inches (300 <br />mm). Do not immediately remove the silicone release sheet. <br />b. Once aligned, peel back a portion of the silicone release sheet and press <br />the membrane onto the substrate for initial adherence. Hold tight and peel <br />back the release sheet by pulling diagonally. <br />c. Use a 75 Ib. (34 kg) roller to press sheet down into the substrate including <br />the laps. Finish by aligning the edge of the roller with the lower end of the <br />side laps and rolling up the membrane. Do not cut the membrane to <br />remove air bubbles trapped under the laps. Squeeze out air bubbles by <br />pushing the roller to the edge of the laps. <br />C. Roof Crickets: <br />Indian River County North RO Plant <br />Roof Replacement 07 22 16-5 Revision 1 Roof Insulation <br />