Raised floors, mainly for use in interior construction, are regulated in DIN EN 12825. As industrially produced modular floor elements, they usually consist of a base layer (panels) and a substructure of height-adjustable supports. A cavity is formed between the base course and the raw ceiling, which can be used for technical installations (e.g. heating, ventilation, electrical). They are always installed "dry" (i.e. without flowing screed), so there are no drying times that delay construction. Together with hollow floors, they belong to the system floors. In contrast to hollow floors, the base course of raised floors, including the wear layer, is modular. The cavity is thus freely accessible at any time and at any point.
There are also raised floors with a perforated wear layer, e.g. made of a perforated sheet, where the cavity can be used to supply or remove the room air, e.g. in clean rooms. There are also raised floors with heating and/or cooling functions. The base course and substructure of raised floors form a jointly tested and approved system. If the approval provides for this, the load-bearing structure of raised floors can/must in certain cases also be supplemented by load-bearing capacity increasing or horizontally stiffening components such as support elements, trusses or grid bars.
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