Revit Tip: Link vs Import CAD in Revit

Choosing whether to link or import CAD can make or break your Revit model’s health and coordination.

Default rule: Link CAD files for coordination; import only when you absolutely must embed or trace 2D details.

When to link

• External references need to update as consultants issue new DWGs.
• You want to keep file size small and model performance high.
• You need per-view visibility control (via Visibility/Graphics > Imported Categories).
• You plan to unload/replace files easily through Manage Links.

When importing is acceptable

• View-specific 2D details that will never update from the source.
• Short-term tracing where you’ll delete the CAD after converting to native Revit elements.
• Minimal, lightweight linework (e.g., a logo) that won’t bloat the model.

Clean the CAD before bringing it into Revit

• Purge multiple times and AUDIT in AutoCAD; remove regapps and unused blocks.
• Explode proxy/AEC objects to basic primitives; bind or remove external references.
• Flatten to Z=0 for 2D details; delete annotation scales and wipeout frames you don’t need.
• Standardize layers, colors, and linetypes (ByLayer) to simplify Revit overrides.
• Confirm units and drawing origin; ensure geometry is near 0,0,0.

Link/Import settings that matter

• Positioning: use Origin to Origin when you control both files; use By Shared Coordinates only when coordinates are established.
• Current View Only: check for 2D details; uncheck for 3D/plan underlays you’ll need in multiple views.
• Colors: Invert to avoid light-on-light linework; Preserve if your office standard expects native colors.
• Layers: Import all, then manage with Query and view overrides; or prefilter to a clean layer set for speed.
• Import Units: set explicitly—don’t rely on Auto-Detect.

Post-placement best practices

• Pin the CAD link immediately and exclude it from selection in the status bar.
• Place links on a dedicated “CAD Links” workset to unload/toggle quickly across the project.
• Use Visibility/Graphics > Imported Categories to control layers, lineweights, and halftone per view.
• Map DWG lineweights: Manage > Additional Settings > Import Line Weights (DWG/DXF) for consistent plotting.
• Use Manage Links to Reload with each consultant update; avoid re-linking to preserve overrides.

Converting CAD to native Revit (only when needed)

• Avoid full explode; it spawns many Line Styles, Patterns, and families—ballooning file size.
• If you must, Partial Explode in a sacrificial drafting view, clean line styles, then Copy/Paste only what’s needed.
• Prefer Pick Lines, detail components, and model elements to “trace” intelligent geometry instead.

Performance tips:

• Keep large CAD links unloaded by default workset; load only in coordination views.
• Use Section Boxes and view filters to limit what’s processed.
• Replace persistent 2D underlays with native Revit detail lines as the design stabilizes.

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