How often should a special inspector observe the turn of the nut method of bolt installation?

The choice of “periodically” for the observation of the turn of the nut method of bolt installation aligns with industry standards and best practices in structural steel construction. Special inspectors are tasked with ensuring that the installation of bolts meets the specified requirements in both the contract documents and relevant standards, such as those outlined by the American Institute of Steel Construction (AISC).

Observing the installation periodically allows the inspector to verify that the torque requirements and the installation techniques are being adhered to without necessitating constant supervision. This approach balances thoroughness with operational practicality, as continuous observation is not always feasible and could detract from the efficiency of the construction process.

A periodic observation enables the inspector to check not just the adherence to installation procedures but also to intervene if any issues arise, ensuring that the integrity of the connection is maintained throughout the construction phase. The inspector can review the installation process at critical points, such as when the bolts are first being installed, or during significant intervals that allow for substantial verification without hindering work progress.