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Orange County Architectural Renovations Smith Sinnett / 2023036 <br />Hillsborough, NC Orange County Asset Management Services <br />METAL FABRICATIONS 05 50 00 - 6 <br />B. Preparation for Shop Priming: Prepare uncoated ferrous-metal surfaces to comply with minimum requirements <br />indicated below for SSPC surface preparation specifications and environmental exposure conditions of installed <br />metal fabrications: <br />1. Exteriors (SSPC Zone 1B) and Items Indicated to Receive Zinc-Rich Primer: SSPC-SP 6/NACE <br />No. 3, "Commercial Blast Cleaning." <br />2. Interiors (SSPC Zone 1A): SSPC-SP 3, "Power Tool Cleaning." <br />C. Shop Priming: Apply shop primer to uncoated surfaces of metal fabrications, except those with galvanized <br />finishes and those to be embedded in concrete, sprayed-on fireproofing, or masonry, unless otherwise indicated. <br />Comply with SSPC-PA 1, "Paint Application Specification No. 1: Shop, Field, and Maintenance Painting of <br />Steel," for shop painting. <br />D. Stripe paint corners, crevices, bolts, welds, and sharp edges. <br />E. Powder Coating: Powder Coat items as indicated to comply with applicable standard listed below: ASTM <br />D3451 06 (2012) <br />1. D2967-07(2013) Standard Test Method for Corner Coverage of Powder Coatings <br />2. D3451-06(2012) Standard Guide for Testing Coating Powders and Powder Coatings <br />3. D4217-07(2013) Standard Test Method for Gel Time of Thermosetting Coating Powder <br />4. D4242-07(2013) Standard Test Method for Inclined Plate Flow for Thermosetting Coating Powders <br />5. D5382-02(2013) Standard Guide to Evaluation of Optical Properties of Powder Coatings <br />6. D5861-07(2013) Standard Guide for Significance of Particle Size Measurements of Coating Powders <br />7. D5965-02(2013) Standard Test Methods for Specific Gravity of Coating Powders <br />8. D6441-05(2010) Standard Test Methods for Measuring the Hiding Power of Powder Coatings <br />9. D7378-10 Standard Practice for Measurement of Thickness of Applied Coating Powders to Predict <br />Cured Thickness. <br />2.16 ALUMINUM FINISHES <br />A. Class I, Clear Anodic Finish: AA-M12C22A41 (Mechanical Finish: nonspecular as fabricated; Chemical <br />Finish: etched, medium matte; Anodic Coating: Architectural Class I, clear coating 0.018 mm or thicker) <br />complying with AAMA 611. <br />PART 3 - EXECUTION <br />3.1 INSTALLATION, GENERAL <br />A. Cutting, Fitting, and Placement: Perform cutting, drilling, and fitting required for installing metal fabrications. <br />Set metal fabrications accurately in location, alignment, and elevation; with edges and surfaces level, plumb, <br />true, and free of rack; and measured from established lines and levels. <br />B. Fit exposed connections accurately together to form hairline joints. Weld connections that are not to be left as <br />exposed joints but cannot be shop welded because of shipping size limitations. Do not weld, cut, or abrade <br />surfaces of exterior units that have been hot-dip galvanized after fabrication and are for bolted or screwed field <br />connections. <br />C. Field Welding: Comply with the following requirements: <br />1. Use materials and methods that minimize distortion and develop strength and corrosion resistance of <br />base metals. <br />2. Obtain fusion without undercut or overlap. <br />3. Remove welding flux immediately. <br />4. At exposed connections, finish exposed welds and surfaces smooth and blended so no roughness shows <br />after finishing and contour of welded surface matches that of adjacent surface. <br />D. Fastening to In-Place Construction: Provide anchorage devices and fasteners where metal fabrications are <br />required to be fastened to in-place construction. Provide threaded fasteners for use with concrete and masonry <br />inserts, toggle bolts, through bolts, lag bolts, wood screws, and other connectors. <br />Docusign Envelope ID: 52FACC74-DA96-491B-B0B8-04AC3961737D