Error · IFC Schema
How to fix Broken aggregate
in IFC files
Fix the broken aggregation relationship — this is almost always an export/interop artefact, so re-export from the authoring tool.
Check your IFC file — free
No account · No upload · Runs in your browser · 38 validation checks
What it means
The Broken aggregate check
IfcRelAggregates points to a non-existent entity
The fix
How to fix Broken aggregate in your authoring tool
Concrete, tool-specific steps. The check itself is schema-agnostic and works for IFC2x3, IFC4, IFC4x1 and IFC4x3.
| Authoring tool | How to fix |
|---|---|
| Revit | Re-export with an up-to-date IFC exporter. If it persists, audit the model (Manage ▸ Purge Unused) and check for corrupt groups or assemblies. |
| ArchiCAD | Re-export with the latest ARCHICAD IFC add-on; run a model check if corruption persists. |
| Tekla | Re-export from Tekla — broken aggregates indicate an interop fault, not a modelling error. |
| Allplan | Re-export from Allplan with an up-to-date IFC interface. |
How it works
Find and fix it in the browser
The whole flow runs client-side — your IFC file never leaves your machine.
01
Open your IFC file
Open IFC Viewer Online and drag & drop your IFC file. It is parsed locally in your browser via WebAssembly — nothing is uploaded.
02
Run the Health Score validation
Run validation. The "Broken aggregate" check (RULE_BROKEN_AGGREGATE) flags every affected element and pinpoints it in the model tree.
03
Fix in Revit
Re-export with an up-to-date IFC exporter. If it persists, audit the model (Manage ▸ Purge Unused) and check for corrupt groups or assemblies.
04
Fix in ArchiCAD
Re-export with the latest ARCHICAD IFC add-on; run a model check if corruption persists.
05
Fix in Tekla
Re-export from Tekla — broken aggregates indicate an interop fault, not a modelling error.
06
Fix in Allplan
Re-export from Allplan with an up-to-date IFC interface.
07
Re-validate
Re-export from your authoring tool and re-run validation to confirm the issue is resolved and your Health Score improved.
Related checks
Other IFC Schema checks →
Check your whole model, not just one rule.
Broken aggregate is 1 of 38 checks. Run the full IFC Health Score to see every issue and a single 0–100 number — free, no account, no upload.
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