The development of suspended ceiling systems in the early 1950s produced a shift in thinking about the function of a ceiling in construction. A ceiling simply had been regarded as a single-plane, fire-protective, finished element overhead. Suddenly, with the introduction of a suspension system, the ceiling also offered access to plumbing, electrical and mechanical components in overhead runs. Today’s suspended ceiling systems offer even more advantages for building construction, including a range of acoustical control options, fire protection, esthetic appearance, flexibility in lighting and HVAC delivery, budget control and optional use of overhead space.
CGC Construction Handbook