Imagine you're in a Brobdingnag dental office, and the dentist is going at a tooth with a 3-foot drill. That's pretty much what it sounds like at work, where workers are repairing crumbling concrete on our building's facade. The first part of the process is to drill through the weakened concrete to reach the rebar below. The noise reverberates all through the concrete structure of the building, but is worst on the adjacent floors.