BIM-Driven Prefabrication

Prefabrication only pays off when the model behind it is right. A spool that arrives a half-inch long, a hanger that lands on a beam, a fitting that does not match the specification — each one turns shop-built efficiency back into field labor. AET produces the coordinated models, spool drawings, and fabrication bills of material that let mechanical contractors prefabricate with confidence, across the U.S. and Canada.

This is not design-intent modeling handed off with the hope that someone downstream resolves it. These are fabrication-level deliverables, built to LOD 400, checked against the project specification, and produced under the responsible charge of a licensed Professional Engineer.

Who This Service Is For

• Mechanical contractors moving work into the shop who need models accurate enough to fabricate from.
• Fabrication shops that need spool drawings and cut lists their fitters and welders can build from directly.
• Design-build teams pursuing prefabrication as a schedule and labor strategy.
• Contractors who tried prefabrication, had pieces that did not fit, and need the modeling layer corrected.

What AET Delivers

• LOD 400 fabrication models for piping, ductwork, and mechanical equipment, built in Revit and CADmep.
• Individual spool drawings with dimensions, fittings, cut lengths, and joint types — the sheets your shop builds from.
• Spool maps that index every fabricated piece to its install location, so the shop, the field, and the delivery truck work from one reference.
• Fabrication bills of material with true linear footage, fittings itemized by type and size, and every line traceable to the model.
• Clash-free coordination against structure and the other trades, resolved in the model before anything is cut.
• Hanger and support coordination, including inserts and embeds where required.

Why Prefabrication Fails — And What AET Does About It

Most prefabrication problems are not fabrication problems. They are modeling problems that were not caught.

• Model-driven, not drawn twice. Every sheet and every BOM line is extracted from a single coordinated model, so the spool drawings, the spool map, and the purchase order cannot drift out of agreement.
• Checked against the specification. AET verifies fitting types and materials against the project specification rather than accepting whatever the fabrication catalog was configured with — a class of error that is easy to miss and expensive to find in the field.
• Built for the shop floor. Dimensions, cut lengths, and joint types are what a fitter needs, not what a design set implies.
• PE-accountable. The work is produced and reviewed by a licensed Professional Engineer. It is not routed offshore.
• Consistent job to job. Deliverable formats are governed by AET’s internal standard operating procedures, so the second job looks like the first.

See an Actual Deliverable

AET publishes a complete sample prefabrication package — the coordination model, the spool map, individual fabrication spool sheets, and the purchasing bill of materials. No form, no email required. Download it and judge the work directly.