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Orange County Solid Waste <br />Scalehouse Building 07 54 00 -10 THERMOPLASTIC SINGLE PLY <br />ROOFING <br />H.At expansion joints,extend flashing membrane over joint and dip into cavity to allow for <br />expansion. <br />I.Soil Pipe/Pipe Penetration: <br />1.Provide field wrapped pipe penetration flashing or manufacturer's prefabricated <br />pipe boot as shown in detail drawing. <br />2.Apply aluminum tape to penetration if asphalt contamination is present. <br />3.Hot-air weld horizontal flashing membrane a minimum of four inches onto the <br />membrane. <br />4.Adhere vertical flashing membrane adhered to pipe penetration and extend a <br />minimum of 1.5 inches horizontal at the base of penetration. Hot-air weld vertical <br />flashing membrane to horizontal flashing membrane. <br />5.Install stainless steel draw band and sealant or hot-air weld flashing cap to <br />terminate top edge of pipe flashing. <br />3.6 HOT-AIR WELDING OF SEAM OVERLAPS <br />A.General <br />1.Hot-air weld seams. <br />a.Minimum 3-inch-wide membrane overlap when automatic machine- <br />welding. <br />b.Minimum 4-inch-wide membrane overlap when hand-welding,except for <br />certain details. <br />c.Minimum width of hot-air weld is 1-1/2 inches. <br />d.Provide wider membrane overlaps or width of welds as required by the <br />roof membrane manufacturer. <br />2.Provide welding equipment by or approved by the membrane manufacturer. <br /> Mechanics intending to use the equipment to have successfully completed a <br />training course provided by a membrane manufacturer's technical representative <br />prior to welding. <br />3.Clean and dry membrane to be hot-air welded. <br />B.Hand-Welding <br />1.Complete hand-welded seams in two stages. Allow hot-air welding equipment to <br />warm up prior to welding. <br />2.Weld the back edge of the seam with a narrow but continuous weld to prevent <br />loss of hot air during the final welding. <br />Docusign Envelope ID: FA2D0569-6BCE-4E38-B3EE-9B3EFD09A753