The Drawing Hold Cascade
Each open RFI places a hold on every drawing that depends on its answer. A question about a column section at gridline C3 holds: the column base plate detail, the column cap plate, all beams framing into that column, the erection drawing for that bay, and the CNC file for every affected member. If that column is in the early erection zone, the hold delays the entire Phase 1 release. If the mill order was waiting on that column piece mark, the order is delayed as well.
The Mill Order Window
Heavy wide-flange sections and HSS in non-standard sizes have lead times of 8–12 weeks from service centers and 16–20 weeks from the mill. If an RFI delays the confirmation of a column section for three weeks, the mill order shifts by three weeks, and the delivery date shifts by three weeks. If the erection start date does not move, the fabricator now has three fewer weeks to fabricate — which means overtime, expedited shipping, or erection delay. All of these have real cost.
Documenting RFI Schedule Impact
Every open RFI should carry an explicit schedule impact statement: 'This RFI holds drawing release PKG-02, currently planned for November 15. Each week of delay to this RFI pushes that release by one week.' This language makes the impact concrete and communicable to the GC and owner without requiring them to understand the detailing workflow.
How RFI Clusters Create Non-Linear Schedule Damage
A single RFI that holds one drawing is manageable. A cluster of five to ten open RFIs that each hold different drawings in the same release package creates non-linear schedule damage — the package cannot be released until every RFI in it is resolved, so the entire package's delay equals the delay of the last RFI answered, not the average. This clustering effect is most severe on projects where detailing starts with incomplete design documents, generating a burst of RFIs in the first two weeks of detailing. When ten RFIs open simultaneously and each requires a two-week response, the drawings for those members are effectively on hold for two weeks regardless of how many are answered early. Project teams that understand this dynamic prioritize resolving all RFIs in a zone before the zone's package release date — not just most of them.
The Fabrication Start Date as the Hard Constraint
Every upstream delay — incomplete input documents, slow RFI responses, extended EOR review cycles — ultimately collides with the fabrication start date, which is fixed by the erection schedule, the GC's critical path, and often a penalty clause. When the detailing timeline compresses, the fabricator faces three choices: accept a later start, pay for accelerated fabrication (overtime, additional shifts), or accept a phased delivery that may not cover the erection crew's first two weeks of work. Each of these choices has a cost. The fabricator who can quantify that cost in terms of delay weeks times specific dollar rates — using the RFI log as evidence — is positioned to recover those costs from the responsible party. The fabricator who cannot document the RFI delay chain has no recovery basis.
Proactive RFI Strategies That Protect the Schedule
Experienced detailing PMs use several strategies to reduce the schedule impact of RFIs before they accumulate:
- Pre-detailing RFI sweep — review all input documents before modeling begins and submit a batch RFI covering all known gaps at kickoff, starting the response clock as early as possible
- Zone-based RFI sequencing — prioritize RFIs in the first erection zone so Phase 1 drawings can be released without holds even if later-zone RFIs remain open
- Parallel detailing around holds — model and detail members that are not blocked by open RFIs while waiting for responses, minimizing idle production time
- Weekly RFI status reports to the fabricator PM — giving the fabricator visibility to escalate slow responses through the GC before the damage compounds
- Pre-submittal coordination call with the EOR — a 30-minute call before the first RFI batch often resolves 40-50% of anticipated questions informally, reducing formal RFI volume
Recovering Schedule Lost to RFI Delays
When RFI delays push the drawing release date past the planned date, recovering the lost schedule requires a coordinated plan between the detailer, fabricator, and GC. Acceleration options available to the detailer include: assigning additional modelers to run parallel drawing production on resolved sections; running extended hours on the detailing team during the peak; and pre-populating CNC files for all unaffected members so the shop can start cutting immediately upon drawing release. On the fabrication side, recovery options include: adding a second shift for cutting and drilling; pre-ordering steel to the service center before final drawing release based on confirmed section sizes; and reserving capacity on the paint line. Each of these costs money — the fabricator's PM should be tracking which party's delay caused the compression and ensuring those costs are directed to the correct cost account.