Such a difference, the rooms take shape for real, and the whole project takes on the feel of a house undergoing work, instead of a construction zone. Drywall installation companies work in specialized crews…one to deliver the drywall and load it into the house, one to hang it on the walls with drywall screws, and one to mud and tape which creates the smooth finished look of an actual wall. Some of our crews were the same for up and downstairs, others were different.