Window and door installation
We install windows and exterior doors into the openings we framed, as part of the same package. That matters because the rough opening and the unit that goes into it are the same problem: openings sized correctly, sills sloped and flashed, units shimmed square, plumb and level, fastened to the manufacturer’s schedule, and sealed to the wall assembly.
When the framer frames the opening and a separate contractor installs the window three weeks later, every discrepancy becomes an argument. When it is one crew, the opening is right because the same people are installing into it.