Subcontractor Transition Left Critical Gaps
A case study on how a mid-project trade transition led to missing MEP slab penetrations and how to implement robust coordination handoffs.

The Handoff Failure
During the structural phase of a mixed-use commercial development, the primary concrete subcontractor faced financial distress. This situation forced the general contractor to terminate their contract and rapidly onboard a replacement trade to keep the project on track.
Although the transition occurred over a two-week period, the incoming crew received only the latest IFC (Issued for Construction) drawing set. Critical information was missing from this handover: informal field notes, RFI responses, and coordination emails detailing custom mechanical sleeve locations remained with the outgoing subcontractor.
When the new subcontractor poured the level three slab, they omitted twelve critical MEP penetrations. This oversight resulted in a solid concrete block blocking the scheduled riser pipes, which went unnoticed until the mechanical trade arrived on site to install the vertical risers.
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