For structural steel that is required to be shop

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For Structural Steel that is required to be shop painted, the require- ments in Sections 6.5.1 through 6.5.4 shall apply. Commentary: Extended exposure of unpainted Structural Steel that has been cleaned for the subsequent application of fire protection materials can be detrimental to the fabricated product. Most levels of clean- ing require the removal of all loose mill scale, but permit some amount of tightly adhering mill scale. When a piece of Structural Steel that has been cleaned to an acceptable level is left exposed to a normal environment, moisture can penetrate behind the scale, and some “lifting” of the scale by the oxidation process is to be expect- ed. Cleanup of “lifted” mill scale is not the responsibility of the Fabricator, but is to be assigned by contract requirement to an appropriate contractor. Section 6.5.4 of this Code is not applicable to weathering steel, for which special cleaning specifications are always required in the Contract Documents. 6.5.1. The Fabricator is not responsible for deterioration of the shop coat that may result from exposure to ordinary atmospheric conditions or corrosive conditions that are more severe than ordinary atmos- Code of Standard Practice for Steel Buildings and Bridges , March 7, 2000 AMERICAN INSTITUTE OF STEEL CONSTRUCTION 35
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APPENDIX PAGE 74 pheric conditions. Commentary: The shop coat of paint is the prime coat of the protective system. It is intended as protection for only a short period of exposure in ordi- nary atmospheric conditions, and is considered a temporary and provisional coating. 6.5.2. Unless otherwise specified in the Contract Documents, the Fabricator shall, as a minimum, hand clean the Structural Steel of loose rust, loose mill scale, dirt and other foreign matter, prior to painting, by means of wire brushing or by other methods elected by the Fabricator, to meet the requirements of SSPC-SP2. If the Fabricator’s workmanship on surface preparation is to be inspected by the Inspector, such inspection shall be performed in a timely manner prior to the application of the shop coat. Commentary: The selection of a paint system is a design decision involving many factors including: (a) The Owner’s preference; (b) The service life of the structure; (c) The severity of environmental exposure; (d) The cost of both initial application and future renewals; and, (e) The compatibility of the various components that comprise the paint system (surface preparation, shop coat and subsequent coats). Because the inspection of shop painting must be concerned with workmanship at each stage of the operation, the Fabricator provides notice of the schedule of operations and affords the Inspector access to the work site. Inspection must then be coordi- nated with that schedule so as to avoid delay of the scheduled oper- ations.
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  • Fall '19
  • Structural steel

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