The basic floor drop panel is similar in nature to the drop panels of raised flooring systems used in large computer and telecommunications installations. It is a 1m square finished surface panel 20-30mm thick, 25mm the most commonly used. It is supported by four 30mm square wedge battens made of wood, recycled HDPE, or aluminum milled with a 10mm flange along the upper edge to fit into the inside perimeter profile slots in an overlapping arrangement so they wedge each other tightly in place. The flange edges are notched in some cases to accommodate the bolts of tension plugs at corners of the Primary frame (the Secondary interior deck grid profiles use tension plug bolts positioned along top and bottom slots) or to allow routing of cables or radiant heat tubing and similar infrastructure features. With 100mm thick floor decks the battens are additionally supported by inset underfloor panels installed in the lower profile slots as the floor deck grid frame is assembled.
Stronger floor panel support battens are possible by milling in a T-rail into the batten shape or by using a continuous milled alloy or HDPE inset frame piece. These, however, require installation during initial floor grid assembly and they cannot be changed without frame disassembly, though this is less of a complication as all floor panels are usually supported the same way and so this batten replacement without changes to the frame itself is unlikely.
The basic drop floor panel is used in combination with finishing strips of matching or complimentary surface material that match the remaining thickness of the floor panel above the floor grid surface (5-10mm), providing a fully flush floor surface. These are usually attached using a ‘U’ channel snap-lock strip attached to their back, countersunk screws, or a cross-point clamp plate which holds down four tabs at the ends of the strips with one screw. Some surface-mount snap-in profile covers -plastic or alloy- may also be used as a finishing strip. Along intervening exposed Primary frame members much wider finishing strips are employed.
In some cases a thinner 20mm thick floor panel is employed and the top surface of the profiles left exposed as an architectural detail. A slot-less profile may then be used (the tension plug bolts moved to the sides) or the slots covered with a snap-in cover strip as available with many profile lines.
An endless array of materials can be used for these drop floor panels, from every type of wood and laminate to plastics, metals, stones, ceramic, and finished cement. Common materials are plywood topped with Masonite, Linoleum, cork, stone veneer, or finished hardwoods.