Fitted ceiling panels are similar to their floor panel counterparts and are used to completely conceal the ceiling framing in order to eliminate cover strips and appear nearly seamless. As with floor panels, three sizes must be used to accommodate the varying space along the ceiling grid; 1025mm square corner panels, 1025x1050mm perimeter side panels, and 1050mm square inner panels. The overlap surface is usually 5-10mm thick over any thicker material. Several possible attachment schemes may be used.
For light materials, fitted ceiling panels can be fashioned like pop-in flush panels employing perimeter folded spring alloy raised edge tab strips that pop into place in the inner ceiling frame slots. By bowing the panels slightly, their tabs can be disengaged for removal. This approach can accommodate rectangular as well as square panels shapes for various decorative tiling schemes.
A similar method, suited to somewhat heavier materials, would employ perimeter spring lock tabs that engage the edges of the facing surface profile slots. These would feature a folded edge that latches to the ridge of the profile slots, hanging the panel from them. Removal would require both lifting and flexing the panels.
Heavier materials may demand a bolt-on attachment of some sort. This is most simply achieved using tapped battens or angles and countersunk screws as with bolt-on wall panels. However, a quick-connect method can be employed by using quick-lock clamps which, though visible, can be exploited as an architectural detail that conceals corners. The quick-locks feature a fixed self-locking T-nut and a compressible polymer sleeve under a clamp plate and head. Panels are fashioned with a trimmed corner to make space for the quick-lock. When panels are placed, the quick-lock is inserted in the profile slot between their corners and pushed upward to compress the polymer sleeve and free the T-nut so it can be turned 90 degrees and engage the slot with some friction. Now locked, the clamp plate holds the four panel corners in place. This attachment method will also accommodate rectangular panels in various tiling schemes. The clamp plates, which can be made of many materials, can also be cut into decorative shapes. This approach is also well suited to textile ceiling covering, the quick-locks used to hold in place large fabric sheets with a compressible backing to created a quilted appearance.