Greenboard is the pejorative term for a type of drywall that is used for walls in damp areas. Experts and industry professionals debate whether greenboard should be used in high-moisture areas. Some believe that cement board such as Durock is best used for tile in highly wet applications such as shower stalls, with greenboard and other water resistant drywall panels kept only to damp or dry areas.
Others believe that water resistant drywall is an effective base material for walls in even the wetter places.
Greenboard's paper facing alone does not inhibit mold growth. It must be treated with mold-resisting agents. Greenboard is still manufactured and sold, but it is slowly being supplanted by paperless drywall that resists moisture and can be used in either dry or moisture conditions.