When should plumbing up guys be installed to plumb up a structure?

Plumbing up guys should be installed after all steel is erected to ensure that the structure is properly aligned and supported. This step is crucial because it allows for the final adjustments to be made to ensure the verticality and stability of the steel framework. At this stage, the ironworkers can assess the complete structure and make necessary adjustments, using the plumbing up guys to pull any out-of-alignment components back into their correct positions. This procedure is vital in ensuring the integrity of the structure before proceeding with additional construction phases, such as installing flooring or other elements.

Other options would not be suitable because installing plumbing up guys before all steel is in place might not provide a complete picture of the necessary adjustments, and doing so during earlier stages can lead to misalignments, necessitating additional corrections later on.