There was a time when installing the mechanical systems of a building might have involved multiple welders, electricians and others working in a confined space on a crowded construction site. U.S. Engineering is working to change that. Instead of building projects one piece at a time, the company is building larger components, such as chiller plants, off-site. CEO Tyler Nottberg said the result is less congested job sites and faster, safer work. "We're building more and more off-site in controlled...