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29 CFR 1926.758 Systems-engineered metal buildings

Metal Buildings
More than 50 percent of industrial buildings in steel erection are systems-engineered. These metal structures use different types of steel members and a different erection process than typical steel erection. They also present certain unique hazards, such as those associated with anchor bolts, construction loads, and double connections.



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(Field-assembled building: See picture at right)
  • All structural columns must be anchored by at least four anchor bolts [29 CFR 1926.758(b)].

  • Rigid frames must have 50 percent of their bolts, or the number of bolts specified by the manufacturer (whichever is greater) installed and tightened on both sides of the web adjacent to each flange before the hoisting equipment is released [29 CFR 1926.758(c)].

  • Construction loads are prohibited from:

  • When girts or eave struts share common connection holes [29 CFR 1926.758(e)]:

    • at least one bolt must remain securely in place for the connection of the first member;

    • a field-attached seat or similar connection device supplied by the manufacturer may be used in lieu of the bolt; and

      Girt
    • both ends of all cold-formed or steel joists must be fully bolted/welded to the support structure before [29 CFR 1926.758(f)]:
      • releasing the hoisting cables, 

      • allowing an employee on the joists, or

      • allowing any construction loads on the joists. 
  • Purlins and girts are prohibited from:

    • being used as an anchorage point for a fall-arrest system, unless written approval is obtained from a qualified person [29 CFR 1926.758(g)];

    • being used as a walking/working surface when installing safety systems, until:
      • all permanent bridging is installed, and

      • fall protection is provided [29 CFR 1926.758(h)].
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