System floors are floor structures that form a cavity between the base and wear layer of the floor and the raw ceiling, which can be used, for example, for technical installations. System floors are divided into hollow floors, with a homogeneous seamless base layer, and raised floors, which consist of individually removable modular elements that allow free access to the cavity at any time and at any point.
In contrast to solid floor constructions with prefabricated or construction site screeds, the cavity of system floors remains largely usable for technical installations, which can also be laid later with little effort, especially in the case of raised floors. Another benefit of raised floors is their use as an air-conducting layer for room ventilation: as a supply air duct in the event of a vertical displacement flow from below (as a displacement air system), e.g. in an open-plan office, or as an exhaust air duct in the event of a vertical displacement flow from above, e.g. in an industrial cleanroom.
Hollow floors, on the other hand, combine the possibility of free underfloor installation with a closed, continuous surface and represent the more cost-effective option for producing a system floor compared to raised floors. The combination of hollow floors with raised floor routes combines free accessibility in the raised floor route area with the economic advantages of hollow floor surfaces.
Compared to solid floor constructions, system floors can have economic advantages in the medium and long term, as, for example, the conversion costs for raised floors are about 30% lower and thus amortize the investment costs of a new construction project, which are about 7% higher (Source: Leaflet of the Federal Association of System Floors e.V. No. 022-Vergleichmodellrechnung-003; December 2013).
Screed duct systems are not regulated as system floors by DIN EN 13213 or DIN EN 12825 and are not part of this bauwion knowledge page.
grid grids: The column grid of system floors (and additionally the modular grid of the base course of raised floors) is usually 600 x 600 mm, different grids are possible in consultation with the respective manufacturer. Especially in peripheral areas, there are often deviating (usually smaller) grid elements.
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Timing of installation: The installation of a system floor must only be carried out after the raw concrete ceiling and the building structure have dried out in order to prevent the formation of fungi. After installation, no moisture may be introduced into the building by subsequent trades that could have an impact on the climatic conditions in the ceiling cavity, see also ►Leaflet No. 3, of the Federal Association of System Flooring e.V.
Application of VOB C: If VOB C is part of the contract during execution, system floors fall under VOB C DIN 18340 (drywall construction work). Built-in parts must be structurally suitable and must not reduce the required load-bearing capacity of the system floor. For raised floors, VOB C DIN 18340 also stipulates the following:
Raised floor renovation: A special topic is the renovation of raised floors. In this process, the damaged or worn raised floor covering is peeled off and replaced by a new floor covering, even during operation. The entire load-bearing substructure can be retained unchanged, and the renovation does not result in any major noise, odor or dust development.
DIN 18340, VOB Procurement and Contract Regulations for Construction Services - Part C: General Technical Contract Conditions for Construction Services (ATV) - Drywall Construction Work
DIN EN 12825, Raised Floors
DIN EN 13213, Hollow Floors
DIN EN 13318, Screed Mortars and Screeds - Terms
►Application guideline for DIN EN 12825 raised floors (pdf), published by the Bundesverband Systemböden e.V.
►Application guideline for DIN EN 13213 Hollow floors (pdf), published by the Bundesverband Systemböden e.V.
►Leaflet No. 3 (pdf), Hygiene requirements in the field of system floors, published by the Bundesverband Systemböden e.V.
MSysBöR, Model Directive on Fire Protection Requirements for System Floors (Model System Flooring Directive), published by the Conference of Ministers and Senators of the Länder responsible for urban development, construction and housing (Conference of Building Ministers, ►IS Argebau). Introduced in the individual German federal states in a legally binding manner, e.g. via the respective list of technical building regulations
BIV Merkblatt 1.06, Natural stone on dry hollow floors, published by the Federal Association of German Stonemasons
ZDB leaflet Pipes, cables and cable ducts on raw ceilings, Notes for Screed Layers and Planners, Publisher: Bundesverband Estrich und Belag e.V. (BEB); Zentralverband des Deutschen Baugewerbes e.V. (ZDB), as of 08/2003
►Bundesverband Systemböden e.V.
►SFE (System Flooring EEIG), European Economic Interest Grouping for System Flooring Conformity
Certificates Source: bauwion
