I finally saw BIM software fail live at a job site in Austin

Was on a remodel job last Tuesday, crew was all set to cut a chase for new ductwork based on the model. Foreman pulls up the tablet, coordinates look perfect, then the actual wall turns out to be 4 inches thicker than the scan showed. We had to stop everything and redo the layout on paper. Three hours lost and the project manager just laughed saying, 'garbage in, garbage out.' Has anyone else had a model that was way off from reality and how do you catch it before it costs you a whole morning?

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