Best Practice: Working with multiple disciplines

Working in MEP engineering often feels like juggling chainsaws. Unlike our architectural counterparts, we aren’t just managing one model; we’re typically balancing Mechanical, Electrical, and Plumbing—each with its own unique requirements—while trying to keep them all synced with the latest architectural and structural updates.

When you have three separate MEP models all trying to link in five different “background” models (Core/Shell, Interiors, Structural, Civil, etc.), you aren’t just designing; you’re spending half your week in the Manage Links dialog.

So, how do we maintain coordination without losing our minds? Enter: The Federated Model.

What is a Federated Model?

Think of the Federated Model (FM) as your project’s “Control Center.” Instead of linking the Architect’s model directly into your Mechanical, Electrical, and Plumbing files, you link everything into one central “shell” model first.

We like to use the analogy of AutoCAD XREFs. In the CAD days, you’d have a clean set of backgrounds ready to be referenced. The Federated Model is the Revit evolution of that “Clean Set.”

The Workflow: How to Set It Up

1. Create the FM: Start a new Revit project named [Project]_Federated_Backgrounds.rvt.
2. Link the World: Link in every background model you need (Architecture, Structure, Landscape, etc.).
3. Clean & Configure: Create specific views for each level (e.g., “BG – Level 1”). In these views, do the heavy lifting: turn off those annoying architectural room tags, hide the furniture you don’t need, and apply View Filters.
4. The Secret Sauce (Attachment vs. Overlay): For this to work, you must set the Reference Type of your background links within the FM to Attachment. This ensures that when you link the FM into your MEP models, the backgrounds “nested” inside it come along for the ride.

Why This Wins (The Benefits)

Once your FM is linked into your MEP production models, the benefits are immediate:

• One Link to Rule Them All: Need to update the Architect’s file to the latest version? Do it once in the FM. Every MEP discipline model will update automatically.
• Consistency is King: If your team decides to hide the Architect’s roof drains (as mentioned in your original draft), you create one View Filter in the FM. By setting your MEP views to “By Linked View,” that change propagates across all disciplines instantly. No more “Why is Plumbing showing the drains but Mechanical isn’t?”
• Reduced File Bloat: Your MEP production models stay leaner because they aren’t bogged down by the overhead of managing half a dozen external links.

The Professional “Gotcha”

While the Federated Model is powerful, it does require a bit of discipline. Because the links are set to “Attachment,” you have to be careful not to create a circular reference (where Model A links Model B, which links back to Model A). Keep your Federated Model strictly as a “container” for backgrounds, and you’ll avoid the dreaded Revit warning loops.

Final Thoughts

In a multi-disciplinary MEP firm, coordination isn’t just a buzzword—it’s the difference between a profitable project and a change-order nightmare. By moving to a Federated Model approach, you stop managing links and start managing the design.