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Orange County Solid Waste <br />Scalehouse Building 07 54 00 -11 THERMOPLASTIC SINGLE PLY <br />ROOFING <br />3.Insert nozzle into the seam at a 45-degree angle to the edge of the membrane. <br /> Once the proper welding temperature has been reached and the membrane <br />begins to "flow,"the hand roller is positioned perpendicular to the nozzle and <br />pressed lightly. For straight seams,the 1-1/2 inch wide nozzle is recommended <br />for use. For corners and compound connections,the 3/4 inch wide nozzle is <br />recommended for use. <br />C.Machine Welding <br />1.Machine welded seams are achieved by the use of automatic welding equipment. <br /> When using this equipment,follow instructions from the manufacturer and local <br />codes for electric supply,grounding and over current protection. Dedicated <br />circuit house power or a dedicated portable generator is recommended. Do not <br />operate other equipment off the generator. <br />2.Metal tracks may be used over the deck membrane and under the machine <br />welder to minimize or eliminate wrinkles. <br />D.Quality Control of Hot-Air Welded Seams <br />1.Check hot-air welded seams for continuity using a rounded screwdriver. Visible <br />evidence that welding is proceeding correctly is smoke during the welding <br />operation,shiny membrane surfaces,and an uninterrupted flow of dark grey <br />material from the underside of the top membrane. Provide on-site evaluation of <br />welded seams daily and to locations as directed by the Engineer or membrane <br />manufacturer's representative. <br />2.Take 1-inch-wide cross-section samples of hot-air welded at least three times a <br />day. Correct welds display failure from shearing of the membrane prior to <br />separation of the weld. Patch test cut areas. <br />3.7 WALKWAY PAD INSTALLATION <br />A.Check membrane seams that are to be covered by walkway pad with rounded <br />screwdriver and repair deficiencies prior to walkway pad installation. <br />B.Clean and dry roof membrane to receive walkway pad. <br />C.Place chalk lines on sheet to indicate location of Walkway. <br />D.Apply a continuous coat of membrane adhesive to the sheet and the back of walkway <br />pad in accordance with membrane manufacturer's technical requirements and press <br />walkway pad into place with a water-filled,foam-covered lawn roller. <br />E.Clean the membrane in areas to be welded. Hot-air weld perimeter of the walkway to the <br />roof membrane. <br />F.Check welds with a rounded screwdriver. Repair deficiencies. <br />G.Provide walk pads where indicated in Contract Drawings and at the following locations: <br />1.Around roof hatches. <br />2.At base and top of fixed wall access ladders. <br />3.Around HVAC units. <br />Docusign Envelope ID: FA2D0569-6BCE-4E38-B3EE-9B3EFD09A753