ceilings
A ceilings is the overhead surface or surface covering a room; the underside of a floor or a roof. It is often used to conceal the floor and roof construction. The height of the ceiling, that is, clear height from floor to ceiling must be determined by a designer. High ceilings (nine or ten feet high) make houses airy and cool in summer, but now there is a tendency to make the ceilings lower In modern architecture ceilings may be divided into two main classes:1) the hung ceiling.
2) the exposed ceiling.
The hung ceilings (hung at some distance below the structural members) conceal much mechanical and electrical equipment such as electrical conduits, air-conditioning ducts, water pipes, sewage lines and lighting fixtures. This kind of a ceiling may be smooth plaster applied to metal lath or translucent plastics. The exposed ceiling does not conceal the mechanical and electrical equipment, but many architects like the aesthetics of the exposed structural system.
