The basic flush ceiling panel system has similarities to the cover plate clamped basic flush wall panel system and can generally employ all the same materials, though usually favoring lighter weight materials and often employing a sound insulation backing. 1m square panels are simply held in place by grid of pre-finished 10mm thick 55-60mm wide cover strips using either ‘U’ channel snap-lock strips or a select set of countersunk screws or cross-point screw clamps much like those used with the floor finishing strips. Long continuous ceiling panels can also be held in place by just parallel cover strips. This is used where, instead of a ceiling frame grid, only the flush bottom edges of the upper floor deck joists are used. In some cases a conventional ceiling grid may only need support from one set of joists, thicker spacer cover strips with a 50mm divider held in place by recessed tabs like the ceiling panels along the main cover strips. This basic ceiling system is suited to a very large assortment of materials, including traditional office ceiling tile, and can even host lighting fixtures using translucent panel materials or integral recessed lighting with lamp and junction boxes supported on the upper deck frame slots.
When the ceiling panel material is particularly thin and opaque, cover strips can be much reduced in thickness as the underlying frame members are concealed. This may even be used with fabric, where the cover strip is reduced to a continuous polymer tensioning wedge that pushes and stretches the fabric into the profile slots and between the two parallel lines of the main frame joists.
Pop-in panels offer the option of a much thinner and optional cover strip that is only cosmetic. Employing semi-rigid materials, these panels either employ a 10mm thickness and 1020mm width, flexing to pop-in directly along the inner profile frame slots, or use raised edge spring alloy angle tabs to let them rest flush to the ceiling surface. Those with raised edge tabs can use them along all four sides. Folded alloy or vacuum-formed plastic panels are also possible, the pop-in tabs integrated into the folded or formed shape. Long continuous panels may also be used between main floor joists. When no cover strip is used, slots may be filled by press-fit profile covers or, in some cases, a slot-less profile may be used. Pop-in panels are generally limited to very light materials.
For heavier panel materials, a bolt-on attachment is employed using thin alloy tabs, possibly fashioned as angles, with screw holes that allow attachment to the facing center profile slots by T-nut. The panel tabs are designed to interleave so that adjacent panels can share a common profile slot. The tabs are then covered by a snap-in finishing strip, which can be quite small, thin, and flush to the panel surface as this approach only needs enough space to conceal the tabs and screws.