If a drywall ceiling is called for, we glue and screw drywall directly to the underside of the roof panels prior to flying them in. Once again, this provides the cleanest possible look for the same reasons mentioned with the walls. It is important to note that most of our roof-systems are designed with purlins or minor rafters placed on 4-foot centers, which means that the vast majority of the drywall seams in the ceiling will be hidden behind the timbers.