Ceilings serve to cover the upper interior structure of an enclosed space like rooms. They hide flooring or roofing above and can be constructed to be fire resistant or decorated. Ceilings help reduce room height and air conditioning needs while concealing fixtures. The main types of ceilings are false/dropped ceilings and structural ceilings. False ceilings include thermocol, gypsum, wood and PVC ceilings. Structural ceilings form the actual roof structure. The document also discusses various window treatments like curtains, drapes, blinds, shutters and valances.