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    By John Flanagan 



    Linking a CAD file is a physical link – so that should the file change you can reload the CAD file and it will update accordingly.

     Any CAD files linked into Revit must follow a careful process:

    1- Bind XRefs: Xrefs can cause problems. Open the Xref dialog box and bind them all,

        preventing duplicate layers.

    2- Run "Purge": This removes unused layers, linetypes, blocks, etc.

    3- Run "Setbylayer": All lines settings should be set to layers, ignoring any colour, linetype

        or lineweight overrides. Use the Setbylayer command to quickly resolve this problem.

    4- Freeze Useless Layers: Freeze all layers not required in Revit.

    5- Save A Copy: Keep the original DWG file just in case. Save the modified file in a Revit

        "CAD Links" subfolder.


    Now that your DWG file is ready, you can bring it to Revit. You will notice that there are two options to bring the DWG file: Import and Link. Avoid using Import CAD. It makes your model heavier, causing performance issues.

    Link CAD is better: it loads the latest version of the DWG each time you open Revit and is more efficient to manage the files.