Direct Answer
When a field condition (anchor bolt misplacement, as-built dimension mismatch, site obstruction) makes the design unworkable, document the condition immediately with photos and measurements, stop the affected work, and submit an RFI with the documentation attached. Field conditions are among the most time-sensitive RFIs because an iron crew and crane may be waiting on the answer.
Full Explanation
Field condition RFIs require faster responses than shop drawing RFIs. The erection crew is typically on overtime, crane costs are running, and the delay cascades to the GC's critical path. To get a fast response: (1) Submit the RFI with photos, measurements, and a clear description of why the design cannot be installed as detailed. (2) Propose 1–2 practical solutions for the engineer to evaluate — a proposed solution cuts response time dramatically. (3) Escalate immediately through the GC if no response within 24 hours. (4) Document all costs of the work stoppage from the moment it begins.
What This Means for Your Shop
Every hour of erection crew time lost to an unresolved field condition RFI is a compensable cost event. Keep a daily cost record during any field work stoppage: crew hours, crane hours, equipment standby. This documentation is your change order basis.
Common Mistakes
Attempting to field-modify a member to fit the unexpected condition without submitting an RFI. If the modification isn't approved, you've created a non-conformance that must be disclosed — and may be directed to restore the member at your own cost.
Recommended Process
Establish a field RFI process before erection begins: who submits, who tracks, what the escalation path is if no response within 4 hours. Brief the ironwork foreman so they know to call you, not modify steel, when they encounter a fit-up problem.