Attachment 1: Specifications - Metropolitan Washington Airports ...

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DCA TERMINAL A IMPROVEMENTS (NEAR TERM) 10 AUGUST 2012 TASK ORDER 03: LOBBY IMPROVEMENTS – PKG 4 - CURBSIDE CHECK-IN RONALD REAGAN WASHINGTON NATIONAL AIRPORT PROJECT DT1203 2.2 MISCELLANEOUS MATERIALS A. Gaskets: As required to seal joints in decorative formed metal and remain weathertight; as recommended in writing by decorative formed metal manufacturer. B. Sealants, Exterior: ASTM C 920; elastomeric silicone sealant; of type, grade, class, and use classifications required to seal joints in decorative formed metal and remain weathertight; and as recommended in writing by decorative formed metal manufacturer. C. Filler Metal and Electrodes: Provide type and alloy as necessary for strength, corrosion resistance, and compatibility in fabricated items. 1. Use filler metals that will match the color of metal being joined. D. Fasteners: Fabricated from same basic metal and alloy as fastened metal unless otherwise indicated. 1. Provide tamper-resistant flat-head machine screws for exposed fasteners unless otherwise indicated. 2.3 FABRICATION, GENERAL A. Shop Assembly: Preassemble decorative formed metal items in shop to greatest extent possible to minimize field splicing and assembly. Disassemble units only as necessary for shipping and handling limitations. Clearly mark units for reassembly and coordinated installation. B. Fold back exposed edges of unsupported sheet metal to form a 1/2-inch- wide hem on the concealed side, or ease edges to a radius of approximately 1/32 inch and support with concealed stiffeners. C. Increase metal thickness or reinforce with concealed stiffeners, backing materials, or both, as needed to provide surface flatness and sufficient strength for indicated use. 1. Support joints with concealed stiffeners as needed to hold exposed faces of adjoining sheets in flush alignment. D. Where welding or brazing is indicated, weld or braze joints and seams continuously. Grind, fill, and dress to produce smooth, flush, exposed surfaces in which joints are not visible after finishing is completed. 2.4 FILLER PANELS A. Stainless-steel Laminate: 1. Laminate 0.0375-inch-thick, stainless-steel sheets to outside face of core and frames at locations and to comply with details indicated. Use adhesive recommended by metal fabricator that will fully bond metal to core and that will prevent telegraphing and oil canning. DECORATIVE FORMED METAL 05 75 00 - 2
DCA TERMINAL A IMPROVEMENTS (NEAR TERM) 10 AUGUST 2012 TASK ORDER 03: LOBBY IMPROVEMENTS – PKG 4 - CURBSIDE CHECK-IN RONALD REAGAN WASHINGTON NATIONAL AIRPORT PROJECT DT1203 B. Corrugated Stainless-steel Panels: 1. Corrugated 0.0375-inch-thick, stainless-steel sheets in stainless-steel frame and to comply with details indicated. a. Corrugation pattern to match existing ticket-counters. C. Metal Reveals and Edges: 1. Fabricate metal reveals for ticket counters from brake-formed, stainless-steel channels and barstock as indicated in Drawings. Drill for mounting screws 6 inches from ends of channels and not more than 24 inches o.c. Locate mounting screws at same heights for all channels. Provide hex-socket, wafer0head screws for mounting reveals. D. Fastener Materials: Unless otherwise indicated, provide the following: 1. Stainless-steel Items: Type 304 stainless-steel fasteners. E. All stainless-steel materials shall be #4 brushed finish unless otherwise indicated. F. All Metal Materials: Remove burrs and ease edges to a radius of approximately 1/32 inch unless otherwise indicated. Remove sharp or rough areas on exposed surfaces. 2.5 GENERAL FINISH REQUIREMENTS A. Comply with NAAMM's "Metal Finishes Manual for Architectural and Metal Products" for recommendations for applying and designating finishes. 2.6 STAINLESS-STEEL FINISHES A. Surface Preparation: Remove tool and die marks and stretch lines, or blend into finish. B. Brushed: No. 4. PART 3 - EXECUTION 3.1 INSTALLATION A. Locate and place decorative formed metal items level and plumb and in alignment with adjacent construction. Perform cutting, drilling, and fitting required to install decorative formed metal. B. Use concealed anchorages where possible. C. Form tight joints with exposed connections accurately fitted together. Provide reveals and openings for sealants and joint fillers as indicated. DECORATIVE FORMED METAL 05 75 00 - 3
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