An arch for a ceiling structure having a first vertical wall stud and a second vertical wall stud. The arch includes an arcuate center section having opposed ends and an arcuate under surface with a first radius of curvature. The arcuate center section is sized and configured such that the opposed ends thereof abut respective ones of the first and second wall studs. The arch further includes a first and second arcuate side section attached to the center section and respective ones of the first and second vertical wall studs. Each of the first and second side sections has an arcuate under surface with a second radius of curvature less than the first radius of curvature. Accordingly, the first and second side sections create a continuous transition between the under surface of the arcuate center section and respective ones of the first and second vertical wall studs.
