Clash detection is not a substitute for design review
Teams often run Navisworks or ACC clash tests as soon as federated models exist — then drown in thousands of hits, many of which are tolerance noise, incomplete LOD, or unresolved design decisions masquerading as geometry conflicts. Design verification is the disciplined step that asks: Is the building designed correctly before we ask if the models intersect?
What design verification includes
Verification is a structured QA pass across disciplines — typically before the first formal clash cycle:
- Spatial alignment — Grids, levels, and core locations consistent across models.
- Design criteria — Ceiling heights, plenum depths, structural bays, and egress widths match the basis of design.
- System routing logic — Major duct, pipe, and conduit paths feasible in allocated zones.
- LOD readiness — Elements modeled to the depth clash tests assume; see LOD guidance.
- Sheet vs. model parity — Key plan dimensions match modeled extents.
Recommended coordination sequence
- Publish federated models with agreed origin and shared coordinates.
- Run design verification checklist (internal or third-party QC).
- Resolve major design conflicts in live coordination meetings.
- Configure clash tests with realistic tolerances and scoped selection sets.
- Track issues to closure with owner, discipline, and target date.
Verification shrinks the clash list to conflicts that matter — not models that were not ready to be compared.
Cutting false positives
Most “clashes” at early phases are false positives: insulation overlaps, generic placeholders, or linked models at wrong elevations. Verification catches these in hours; clash meetings spent on them burn trust and schedule. Tune tests by zone (shafts, corridors, equipment rooms first) and by discipline pair — architecture vs. structure before MEP density is finalized.
For a deeper dive on clash workflow economics, read BIM clash detection best practices.
Production QC for verification
External BIM partners can run verification checklists against your BEP, flagging issues in ACC or BIM Track before your internal team invests in clash resolution. This is especially valuable when in-house coordinators are spread across multiple active permits.
FAQ
How long should verification take?
For a typical mid-rise core-and-shell, budget 2–4 days of focused QC at DD and again at 75% CD — far less than rework from skipped checks.
Who signs off on verification?
Lead designer or PM for design criteria; BIM manager for model integrity; MEP lead for routing feasibility.
Need third-party BIM verification or coordination? Request a quote or see BIM services.
Cadeonn delivers federated Revit models, clash coordination, and LOD-controlled BIM for architects and engineers serving the U.S. market. Extend BIM capacity without long hiring cycles: request a quote or see BIM services.