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  2. Dropped ceiling - Wikipedia

    en.wikipedia.org/wiki/Dropped_ceiling

    Approved drop out (or drop-out) ceilings allow the installation of a dropped ceiling beneath existing fire sprinklers because the tiles, sometimes called melt-out ceiling tiles, are heat-sensitive and are designed to fall from the dropped ceiling suspension grid during a fire, allowing the sprinklers to spray their water.

  3. Waffle slab - Wikipedia

    en.wikipedia.org/wiki/Waffle_slab

    Waffle slabs are preferred for spans greater than 40 feet (12 m), because, for a given mass of concrete, they are much stronger than flat slabs, flat slabs with drop panels, two-way slabs, one-way slabs, and one-way joist slabs. [2] Section of a waffle slab including beam, ribs, and column head

  4. Plenum space - Wikipedia

    en.wikipedia.org/wiki/Plenum_space

    In all such cases, discovery, and repair of such problems to eliminate unintended plenums is difficult due to the hidden nature, limited space, and difficult access of most installed drop ceilings. For highest fire safety, it is best to assume all drop-ceiling and raised-floor airspaces are plenums, whether or not they are officially designated ...

  5. Soffit - Wikipedia

    en.wikipedia.org/wiki/Soffit

    curvature of e.g. plasterwork to fill the space above the kitchen cabinets, at the corner of the ceiling and wall: coving (interior design) underside of office ceiling of tiles (often gypsum) suspended, fastened or bonded to a grid system attached to the walls and/or ceiling: false/suspended ceiling (tiles/grid) or dropped ceiling

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  7. Ceiling - Wikipedia

    en.wikipedia.org/wiki/Ceiling

    A ceiling can also be the upper limit of a tunnel. The most common type of ceiling is the dropped ceiling, [citation needed] which is suspended from structural elements above. Panels of drywall are fastened either directly to the ceiling joists or to a few layers of moisture-proof plywood which are then attached to the joists. Pipework or ducts ...