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<br />076200.5 – FLASHING AND SHEET METAL <br /> <br />Project Manual for Motor Pool Main Building Roof Replacement <br />Orange County, Hillsborough, NC <br />Prepared by Atlas Engineering, Inc., 551-A Pylon Drive – Raleigh, NC 27606 <br />August 2021 <br /> <br /> <br />J. Panel Closures: Provide sheetmetal closures/supports along cut edges of panels. <br /> <br />K. Cleats: Continuous cleats, offset cleats: Cleat materials shall match the type of the flashing <br />material that will be attached to them and shall be one gauge heavier than the material they are <br />securing unless otherwise noted herein or on the design details. Where cleats may be visible, <br />match the pre-finished color of the metal they are securing. <br /> <br />L. Support Plates/Angles/Closures: Minimum 20 gauge G90 galvanized steel unless otherwise noted <br />in the design details. Angles provided as part of the parapet wall assembly shall be as specified in <br />the structural steel sections of this Project Manual. <br /> <br />2.02 FASTENERS AND ACCESSORY MATERIALS <br /> <br />A. Fasteners: Shall be type and size as required by construction. Specific fastener types and sizes <br />should be noted on roofing shop drawings for approval by the Designer. When fasteners will be <br />covered by membrane flashings or sheet metal, head profiles should be selected to minimize <br />pressure on the backside of covering materials or fasteners should be countersunk slightly. <br /> <br />B. For metal to metal fasteners, use self-tapping, self-drilling, no. 12 stainless steel sheet metal <br />screws. When exposed use fasteners with integral EPDM washers. <br /> <br />i. For concealed fastening into wood, use No. 10, stainless steel, self-drilling wood screws. <br />Minimum embedment shall be 1-1/2”. <br />ii. For exposed fastening into wood, use stainless steel self-drilling screws with integral <br />EPDM washers. <br />iii. For fastening into concrete, use ¼” diameter, masonry/concrete anchors with neoprene <br />washers. Use all metal stainless steel anchors only, no plastic or nylon anchors allowed. <br />Minimum embedment shall be 1”. Do not use drive pins without advance approval, provide <br />pre-drilled fasteners to prevent damage/spalling to the substrate. <br /> <br />C. Pop Rivets: Shall be 1/8 inch to 3/16 inch diameter with stainless steel mandrels and washers, <br />color to match pre-finished metal. <br /> <br />D. Tape Sealant: Shall be a 7/8" x 3/16" butyl tape sealant with a double bead. Tape sealant shall be <br />non-curing, non-skinning, non-staining, non-corrosive, non-shrinking, non-oxidizing, non-toxic <br />and non-volatile. Composition shall be 99% minimum solids with a butyl base meeting <br />performance standards in Federal Specification TT-C-1796A; Type II, Class B. Service <br />temperature shall be -60 degrees F to +212 degrees F. Tape sealant will not be used at exposed <br />locations. <br /> <br />E. Gunnable Sealant: Elastomeric sealant shall be low modulus, non-staining, non-sag, one-part <br />urethane-based sealant of gun-grade consistency. Sealant shall be easily workable and shall be <br />capable of producing a smooth attractive finish. For joints in vertical surfaces, provide ASTM C <br />920, Type S or M, Grade NS, Class 25, Use NT. For joints in horizontal surfaces, provide ASTM <br />C 920, Type S or M, Grade P, Class 25, Use T. Sealant shall be Dynatrol I, by Pecora <br />Corporation; Sikaflex 15LM, by Sika Corporation, or approved equal. <br />DocuSign Envelope ID: 9514E4EC-C3C9-4752-8A7F-22E83B22BB8E