Building Information Modeling is the practice of designing and coordinating a building in a data-rich 3D model. Each element (a duct, a beam, a fire damper) is an object with properties like size, system, manufacturer and location. Teams use the model for clash detection, quantity takeoffs, sequencing (sometimes called 4D) and cost (5D), and hand it to the owner for operations.
Why it matters
Clashes found in the model are cheap. Clashes found in the field become RFIs, change orders and schedule hits. BIM also gives estimators and project managers quantities they can trust, if the model is maintained.
Worked example
Illustrative: if the mechanical model on Riverside Medical Center had included fire dampers at every rated wall penetration, a clash or model check would have flagged the gap before the ductwork went up. Instead, the super found it in the field, which led to RFI-212 and CO #14 for $86,400.
Common mistakes
- Treating the model as a design deliverable and letting it go stale during construction.
- Assuming “BIM” means the model is coordinated; many models are 3D drawings with little data.
- Disconnecting the model from cost and schedule, so its quantities never reach the budget.
How os.construction handles it
We’re not building a modeling tool. We’re designing the data core so model-derived records like RFIs, quantities and locations can link to the same job cost and schedule records, working this out with founding contractors.