http://mobile.bloomberg.com/news/2013-05-31/ipads-supplanting-blueprints-boosts-builder-productivity.html As the wind whips through the top floor of an unfinished eight-story office building a block west of the White House, Steven Denbow points to metal air ducts as an example of work that wouldn’t need to be redone. The 29-year-old senior project engineer for Balfour Beatty Plc (BBY) ran three-dimensional simulations before construction began, finding hundreds of clashes, or design elements that interfered with each other. When the software indicated water pipes would intersect the ducts, he requested changes so workers didn’t have to rebuild parts of the $29 million project. Armed with iPads linked to the newest plans, work orders and information requests, specialists such as Denbow…