Warning · Clash detection
How to fix Element clash
in IFC files
Resolve the geometric clash between elements in the authoring tool — move, trim, or join the conflicting elements.
Check your IFC file — free
No account · No upload · Runs in your browser · 38 validation checks
What it means
The Element clash check
Two structural elements have overlapping bounding boxes
The fix
How to fix Element clash 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 | Run Collaborate ▸ Interference Check to locate clashes, then move/trim/join the elements to resolve the overlap. |
| ArchiCAD | Use Design ▸ Collision Detection to find overlaps, then adjust the conflicting elements. |
| Tekla | Use Manage ▸ Clash Check to find and resolve overlapping parts. |
| Allplan | Use the collision check to locate overlaps and adjust the conflicting elements. |
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 "Element clash" check (RULE_ELEMENT_CLASH) flags every affected element and pinpoints it in the model tree.
03
Fix in Revit
Run Collaborate ▸ Interference Check to locate clashes, then move/trim/join the elements to resolve the overlap.
04
Fix in ArchiCAD
Use Design ▸ Collision Detection to find overlaps, then adjust the conflicting elements.
05
Fix in Tekla
Use Manage ▸ Clash Check to find and resolve overlapping parts.
06
Fix in Allplan
Use the collision check to locate overlaps and adjust the conflicting elements.
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 Clash detection checks →
Check your whole model, not just one rule.
Element clash 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.
Run the free Health Score →