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Chapter 6 Structural Steel

properly implementing the fabrication and quality control procedures outlined above. Verification may be on a job basis or by inspection within the previous twelve months.


SICC-604.1 Material receiving. The SIER shall inspect steel elements, welding material, and high strength bolts for conformance with NCSBC -Table 1704.3.

SICC-604.2 Steel elements. The SIER shall inspect steel elements in accordance with NCSBC-1704.3.

NCSBC -1704.3 Steel construction. The special inspections for steel elements of buildings and structures shall be as required by Section 1704.3 and Table 1704.3. Where required, special inspection of steel shall also comply with Section 1715.

Exceptions: 1. Special inspection of the steel fabrication process shall not be required where the fabricator does not perform any welding, thermal cutting or heating operation of any kind as part of the fabrication process. In such cases, the fabricator shall be required to submit a detailed procedure for material control that demonstrates the fabricator's ability to maintain suitable records and procedures such that, at any time during the fabrication process, the material specification, grade and mill test reports for the main stress-carrying elements are capable of being determined. 2. The special inspector need not be continuously present during welding of the following items, provided the materials, welding procedures and qualifications of welders are verified prior to the start of the work; periodic inspections are made of the work in progress; and a visual inspection of all welds is made prior to completion or prior to shipment of shop welding.

    • 2.1.

      Single pass fillet welds not exceeding 5/16 inch (7.9 mm) in size.

    • 2.2.

      Floor and roof deck welding.

    • 2.3.

      Welded studs when used for structural diaphragm.

    • 2.4.

      Welded sheet steel for cold-formed steel framing members such as studs and joists.

    • 2.5.

      Welding of stairs and railing systems.

NCSBC-1704.3.1 Welding. Welding inspection shall be in compliance with AWS D1.1. The basis for welding inspector qualification shall be AWS D1.1.

NCSBC -1704.3.2 Details. The special inspector shall perform an inspection of the steel frame to verify compliance with the details shown on the approved construction documents, such as bracing, stiffening, member locations and proper application of joint details at each connection.

NCSBC-1704.3.3 High-strength bolts. Installation of high strength bolts shall be periodically inspected in accordance with AISC specifications.

NCSBC-1704.3.3.1 General. While the work is in progress, the special inspector shall determine that the requirements for bolts, nuts, washers, and paint; bolted parts; and installation and tightening in such standards are met. For bolts requiring pretensioning, the special inspector shall observe the pre-installation testing and calibration procedures when such procedures are required by the installation method or by project plans or specification; determine that all plies of connected materials have been drawn together and properly snugged; and monitor the installation of bolts to verify that the selected procedure for installation is properly used to tighten bolts. For joints required to be tightened only to the snug tight condition, the special inspector need only verify that the connected materials have been drawn together and properly snugged.

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