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Conspectus News Bulletin Oct. 28, 2009
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Regular News Bulletin of Conspectus Inc. addressing design & construction technical issues
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Conspectus News Bulletin Oct. 28, 2009
1.
NEWS BULLETIN
www.conspectusinc.com Vol 09.10.01 ©2009 Conspectus Inc. Experience, Quality, & Value Beyond Words Page 1 of 2 Providing: Specifications, Quality Assurance, Zinc Coatings and Metal Studs Inspections & Investigations for your Construction Projects By Justin Lane, CSI, SCIP ABSTRACT: Introduction The zinc coating selection and There are many different types of The steel passes into the heating thickness for metal studs requires zinc coatings available. The major or annealing furnace to soften the knowledge of the corrosiveness of galvanized types are batch hot-dip steel and impart the desired the environment in which the galvanizing, continuous sheet strength and formability. product will be used and the code galvanizing, zinc plating, requirements for the proper In the furnace, the steel is coating type and weight. electrogalvanizing, mechanical maintained under a reducing gas plating, zinc spraying, and zinc atmosphere to remove any oxide FILING: painting. that may be on the steel surface. UniFormat™ This article will discuss continuous The steel then passes through a B2010 - Exterior Walls sheet galvanizing which is the vacuum chamber to the molten C1010 - Partitions predominant method used on zinc coating bath to prevent any sheet steel for structural and air from re-oxidizing the heated MasterFormat™ nonstructural steel studs. steel. The steel sheet is sent 05 54 00 - Cold-Formed Metal The hot-dip process for around a submerged roller, which Framing. continuous sheet galvanizing reacts with the molten metal to 09 22 16 - Non-Structural Metal produces four different types of create the bonded coating. Framing coated products, including The steel is then removed in a (G)-zinc, (A)-zinc-iron alloy, KEYWORDS: vertical direction and high (AZ)-55% aluminum-zinc alloy, pressure air is used to remove any Stud, Coating, Continuous Sheet and (GF)-zinc-5% aluminum alloy. excess molten zinc to create a Galvanizing, Hot-Dip, Zinc, Galvanized In North America there were controlled coating thickness. approximately 85 hot-dip lines in The steel is then cooled to allow REFERENCES: 2004. Each could apply at least the zinc to solidify onto the steel one of the coatings listed above. ASTM A653 - Standard surface before the steel contacts Specification for Steel Sheet, Zinc- another roller to avoid transferring Coated (Galvanized) or Zinc-Iron or damaging the coating. Alloy-Coated (Galvannealed) by Continuous Sheet the Hot-Dip Process Galvanizing Process Selecting the Correct The molten coating is applied onto Coating Thickness ASTM A1003 – Standard Specification for Steel Sheet, the steel surface by passing a Although hot-dipped galvanizing Carbon, Metallic, and Nonmetallic continuous ribbon of steel through is available in a variety of coating – Coated for Cold Formed Framing a bath of molten zinc at speeds up weights ranging from G01 to Members to 600 feet per minute. Sheet size G360, the steel stud industry can range from 0.010 to 1.70 typically offers three standard zinc ASTM C645 - Standard inches thick, and up to 72 inches coatings G40, G60, and G90 with Specification for Nonstructural wide. 0.40, 0.60, and 0.90 total ounces Steel Framing Members The coating process begins by of zinc per square foot, cleaning the steel with alkaline respectively, applied to both sides ASTM C955 - Standard of the sheet metal. The standard Specification for Load-Bearing liquid combined with brushing and followed by rinsing, and drying of coatings requirements for (Transverse and Axial) Steel Studs, the steel. structural products are listed in Runners (Tracks), and Bracing or Bridging for Screw Application of ASTM C955 and nonstructural Gypsum Panel Products and Metal products are found in ASTM C645. Plaster Bases
2.
NEWS BULLETIN
www.conspectusinc.com Experience, Quality, & Value Beyond Words Vol 09.10.01 ©2009 Conspectus Inc. Page 2 of 2 The metallic coating requirements Figure 1 shows the estimated for structural studs can be found service life for the various coating Conclusion within ASTM C955 Table 1. The thicknesses, assuming full table lists three coating exposure during the life cycle. Understanding what galvanized designators CP40, CP60, and CP90 (Illustration used with permission coatings are available is the first that permit coatings using any one from www.galvinfo.com.) step in selecting what coating is of the four galvanizing types. right for your product and project. ASTM C955 states that structural Identifying Studs in We suggest the following as the minimum coatings based on use: studs must have a minimum the Field protective coating CP60. The CP60 Exterior Walls: G90; Interior Wet designator requires G60 as the Most Architects don't carry Areas: G60; and Interior Dry Areas: minimum zinc coating or A60, micrometers to the field to check G40, the default by ASTM C645. AZ50 or GF30, the equivalent of metal thicknesses. A disk the other permitted coatings. micrometer is required for use on Be sure to take advantage of your dimpled studs produced by many product reps to assist in selecting For ASTM C645 nonstructural manufacturers today and will also the correct coating thickness for studs, a minimum G40 zinc work on flat studs. your metal studs, especially for coating conforming to ASTM A653 unusual conditions. For additional is required. The standard also The International Building Code information to help select coating allows other protective coatings (IBC) 2006 and 2003, for both thicknesses, refer to the GalvInfo with an equivalent corrosion structural and nonstructural Notes series of documents. resistance. products, by referencing ASTM C955 and ASTM C645, require that When extreme humidity, salt spray all studs and tracks be labeled at a or corrosive environments are maximum 96 inches on center. anticipated, a G90 coating weight The marking must show the is recommended, which most manufacturer's identification, manufacturers offer as a special minimum uncoated metal purchase item. It is important to thickness, minimum yield strength The information contained in this remember that for all continuously document is offered for educational (ksi) and coating type and weight. purposes, only, and not as technical galvanized sheet materials, the advice suitable for any particular coating weight is given as the total Therefore, if the product is not project or specific condition. Technical marked, it is not code consulting is unique to the facts of a zinc weight for both sides of the compliant material and should particular condition, and Conspectus sheet. This coating weight is not not even be allowed on the recommends that a specialist be necessarily evenly divided between jobsite. consulted to determine solutions for both sides of the sheet. each specific condition.