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C. Polyurethane Sealant: One -component elastomeric gun grade polyurethane sealant <br />conforming to ASTM C 920, Type S, Grade NS, Class 25, and use NT, M, A, G, or O as <br />required by substrate conditions.. Color to match adjacent materials. <br />D. Silicone Sealant: Shall be a one -component, non -sag, neutral cure, low -modulus, UV <br />resistant, high performance silicone sealant. Shall meet ASTM C 920, Type S, Grade <br />NS, Class 100, Use M, G, A or O. Color to match adjacent materials. <br />E. Sealant Tape: Minimum ''/z" wide non -skinning butyl sealant tape. <br />F. Aluminum Tape: Pressure -sensitive, 2" wide aluminum tape used as a separation layer <br />between small areas of asphalt contamination and the membrane and as bond breaker <br />under the metal edge cover plates. <br />G. Backer Rod: Closed -cell polyethylene or polyurethane rods sized approximately 25% <br />larger than joint opening. <br />H. Non -Shrink Grout: High early strength, non -rusting non -shrink grout conforming to <br />ASTM C 1107 Grade C (modified for rapid -setting grout) such as 747 Rapid Setting <br />Grout as manufactured by ThoRoc (ChemRex), Multi -Purpose Non -Shrink Grout as <br />manufactured by US Mix, or Sikagrout 212 as manufactured by Sika. <br />I. Pourable Sealer: Two-part pourable polyurethane sealant conforming to ASTM D 429, <br />and designed to seal around penetrations. <br />PART 3 EXECUTION <br />3.01 EXANIINATION <br />A. Coordinate with other work for correct sequencing of items which make up the entire <br />system. <br />B. Ensure substrates are installed, secured and modified to accommodate sheet metal <br />flashings. <br />C. Deficiencies associated with the sheet metal substrates shall be reported to Engineer <br />before beginning sheet metal work. All such deficiencies shall be corrected before <br />installing sheet metal flashings. <br />3.02 INSTALLATION <br />A. General: <br />1. All joints to be locked and sealed or soldered. <br />2. Provide for thermal movement (expansion and contraction) of all exposed sheet <br />metal. <br />3. Where dissimilar metals contact, galvanic action shall be prevented by means of <br />heavy coat of asphalt paint. <br />4. Prime all metal surfaces (top and bottom) to receive bituminous materials. Allow <br />primer to dry thoroughly before application of bituminous materials. <br />5. All metal flanges shall be installed on top of membrane and adhered as indicated <br />in detail drawings. Metal flanges connected to the roof shall be installed per <br />membrane manufacturer's specifications and the requirements herein. <br />Indian River County West WWTP <br />Roof Replacement 07 62 00-4 Sheet Metal Flashing and Trim <br />