Clash Detection
The process of finding physical conflicts between disciplines in a federated BIM model before they hit site.
What is Clash Detection?
Clash detection is the core value proposition of BIM coordination. Before BIM, architects, structural, and MEP teams worked on separate 2D drawings — and the conflicts (a duct hitting a beam, a pipe through a column) only appeared once construction had started, costing weeks of rework.
In modern BIM, clash detection happens in Navisworks (or BIM 360 Coordinate cloud). The Coordinator federates all discipline models, runs automatic clash tests with configurable tolerances, then triages: **hard clashes** (real physical conflicts), **soft clashes** (spatial conflicts like access clearance), and **workflow clashes** (sequence issues).
A typical large project starts with 5,000+ clashes after first federation. Through weekly coordination, the count drops to under 100 before construction starts. The BIM Coordinator owns this process.
Clash detection skill is exactly what UAE BIM hiring panels probe for. Indian fresh graduates without coordination experience cap out at ₹4–5 LPA; coordinators reach ₹8–12 LPA quickly.
A BIM Coordinator at Tata Projects runs Navisworks clash detection on a Mumbai metro station model — 8,200 initial clashes drop to 47 critical ones after 6 weeks of weekly RFI cycles. The on-site contractor reports zero MEP rework needed during installation.
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