Curtain wall systems in Revit carry significant coordination risk. The architectural model typically shows design intent, while the facade contractor requires fabrication-level detail. Structural connections, slab edge positions, and drainage routes all depend on accurate curtain wall geometry.
Why This Matters
Curtain wall offset from the structural frame, mullion alignment with floor slabs, and drainage routing through the facade all create multi-discipline clashes that are expensive to resolve after construction documents are issued.
Practical Guidance
Grid and Panel Configuration: Define curtain grid layout based on the structural bay grid. Misalignment between architectural mullion spacing and structural column positions creates aesthetic and connection coordination problems.
Slab Edge Coordination: Structural slab edges must be modeled accurately for curtain wall attachment. The architectural Revit model should reference structural levels and slab offsets rather than assuming a nominal edge position.
Drainage Integration: Curtain wall drainage routes through slab penetrations to internal drainage points. Coordinate drainage sleeve positions with structural and plumbing models before facade shop drawing submission.
LOD for Coordination vs Fabrication: The architectural model typically delivers LOD 300 curtain wall geometry. Facade contractors require LOD 400 with connection details. Confirm handoff responsibilities and model LOD in the BIM Execution Plan.
Checklist
- Align curtain grid to structural bay spacing
- Mark slab edge positions in coordination model before facade design freeze
- Confirm drainage sleeve positions with plumbing before structural casting
- Agree LOD handoff point with facade contractor in BEP
LUA BIM LABS Insight
The gap between architectural curtain wall intent and facade contractor fabrication is where projects lose money — close it with early coordination, not RFIs.
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