Gypsum is a naturally occurring mineral. Gypsum board is factory-manufactured from gypsum with water and a few additives, sandwiched between paper. They are lightweight, heat-insulating and fire-retardant. Gypsum boards or panels come in a prefabricated ready-to-install form. They are fixed with screws to a metal frame that is attached to the ceiling slab or soffit (the underside of a structure).