![]() ![]() dropped ceiling patents to September 8, 1958įirst fully developed grid system conceptįirst integration of tiles and grid. Brown has sometimes been credited as being the inventor of the dropped ceiling even though other patents preceded his as shown in the table below. Patent Number US 2,984,946 A was granted on May 23, 1961. This invention provided suspended ceiling construction in which access may readily be obtained at any desired location. Brown of Westlake, Ohio, filed for a patent for Accessible Suspended Ceiling Construction. This process could be time-consuming and expensive. Once the repair or inspection was completed, the tiles had to be reinstalled. Initially modern dropped ceilings were built using interlocking tiles and the only way to provide access for repair or inspection of the area above the tiles was by starting at the edge of the ceiling, or at a designated "key tile", and then removing contiguous tiles one at a time until the desired place of access was reached. Hall on May 28, 1919, and granted on October 16, 1923. 1,470,728 for modern dropped ceilings was applied for by E. Blackfriars Theatre in London, England, built in 1596, had dropped ceilings to aid acoustics. These could be made with simple planks, or coffered. It may also be referred to as a drop ceiling, T-bar ceiling, false ceiling, suspended ceiling, grid ceiling, drop in ceiling, drop out ceiling, or ceiling tiles and is a staple of modern construction and architecture in both residential and commercial applications.ĭropped ceilings and ceiling tiles were used in Japan for aesthetic reasons as early as the Muromachi Period (1337 to 1573). In addition, there is a separate standard for suspended systems in seismic zones: ASTM E580 Standard Practice for Installation of Ceiling Suspension Systems for Acoustical Tile and Lay-in Panels in Areas Subject to Earthquake Ground Motions.Secondary ceiling hung below a main ceilingĭropped ceiling featuring ceiling tiles, lights, air diffusers, smoke detector, and more Dropped ceiling with ceiling tile light fixtureĪ dropped ceiling is a secondary ceiling, hung below the main (structural) ceiling. ![]() Refer to to the codes of your jurisdiction for more detailed information. Some of these considerations include wider edge moldings, limits on size of ceiling or weight of ceiling, additional attachment requirements, additional bracing requirements, and additional inspection requirements. 12" x 12"įor suspended ceilings in seismic zones, special considerations must be made. Standard sizes are listed below in inches. Ceiling panels can be made in virtually any shape. In addition to the standard panels, custom panels are available from most manufacturers. Lay-In ceiling panels come in a wide variety of shapes and sizes. Finally, ceiling panels are dropped into the grid to finish the ceiling. Edge molding shapes are attached to the walls around the perimeter of the room. Shorter cross T segments connect to the main beam T shapes to make a rigid frame. The continuous main beam T shapes are suspended from the structure above by hanger wires. The diagram below identifies the major components of a suspended lay-in ceiling. The most common sizes are 24" x 24" or 24" x 48". The come in various shapes and sizes and are laid into an exposed grid. Lay-In Ceiling Panels are more common today. Tiles were popular in the 1980s, but are not used as often anymore. The effect was to create a monolithic look while still providing access to services above the ceiling. In reality, these are actually ceiling panels.Ĭeiling Tiles are mechanically fastened to a concealed suspension grid. However, ASTM C636 Standard Practice for Installation of Metal Ceiling Suspension Systems for Acoustical Tile and Lay-In Panels makes a distinction between tiles and panel. We often refer to the ceilings you see below as an "ACT ceiling", meaning acoustic ceiling tiles. Acoustic Ceiling Tilesįirst, we have to address the nomenclature for suspended ceiling systems. Ceiling TilesĪcoustic Lay-In Ceiling Panels vs. ![]()
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