Industry Foundation Classes (IFC) is the open international standard for sharing BIM data between software applications and between project stakeholders. Every BIM discipline — architectural, structural, MEP, civil — produces and consumes IFC files at some point in a project lifecycle.
Why This Matters
Proprietary BIM formats (RVT, DWG, NWD) cannot be reliably exchanged between different software tools without data loss. IFC provides a neutral format that preserves geometry, properties, and relationships regardless of what software created or receives the file.
Practical Guidance
What IFC Contains: An IFC file contains building elements (walls, beams, ducts), their geometric representations, spatial structure (site, building, floor, space), properties (material, fire rating, quantity), and relationships between elements (contained in floor, connected to system).
IFC Versions: IFC2x3 is the most widely supported version in current tools. IFC4 adds improved geometry, 4D and 5D support, and better property handling. IFC4.3 extends IFC to infrastructure. Check software support before specifying an IFC version in a BIM Execution Plan.
Who Uses IFC: Architects export IFC for regulatory submission and structural coordination. Structural engineers export IFC for MEP clash detection. MEP engineers export IFC for commissioning and FM handover. Contractors receive IFC for site management and quantity takeoff.
Common Misconceptions: IFC is not a replacement for native BIM models in design workflows. It is a delivery and coordination format. Editing an IFC file and re-importing it into Revit does not work reliably — native model updates should originate in the authoring tool.
Checklist
- Specify IFC version in BIM Execution Plan before first issue
- Confirm software IFC support before requiring IFC delivery
- Validate IFC files in a viewer before distribution
- Do not use IFC as the primary design working format
LUA BIM LABS Insight
IFC is the language buildings speak when disciplines need to understand each other — learn it as a professional communication skill, not just a file format.
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