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Health & Fit cavity floor: What is it?

17:40  15 september  2021
17:40  15 september  2021 Source:   haus.de

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cavity floors have been established since the seventies especially in office space and data centers. With such a system floor, all cables and electrical lines can be released invisibly and lead through the floor openings to the respective computers. This prevents so-called "cable salad".

Bei Hohlraumböden tragen Stahlstützen die obere Schalung. In dem Zwischenraum lassen sich Kabel und Lüftungssysteme verlegen. © Provided by the house in cavity floors wear steel supports the upper formwork. The space can be used to lay cables and ventilation systems. What is a cavity floor?

A cavity floor (also called hollow bottom) is a system floor mounted using steel supports (often support feet) on the substructure. This creates a cavity between the upper support layer and the rough floor, which is used to accommodate electrical installations, ventilation systems and heating tubes.

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Compared to the flush-mounted installation, which corresponds to the standard in private houses, can be carried out quickly and easily in a hollow bottom changes and maintenance work on the lines.

How is a cavity floor built up?

The support layer of the cavity floor consists of a thin formwork of cement fiber, gypsum fiber, or plasterboard plates forming a closed surface. For wet hollow floors, an additional layer flow screed is added on the plates. Almost all floor coverings can be moved to the carrier plates, for example, parquet, laminate, PVC or tiles.

What types of hollow floors are there?

Depending on the version, a distinction is made between:

wet hollow floors (cast cavity floors)

are made of formwork elements made of gypsum fiber plates, to which a layer of anhydrite flow screed ( calcium sulfate flow screed ) is poured. Between the screed and the carrier plates there is a separation layer (usually a PE foil).

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dry cavity floors (surface hollow floors)

The multilayer gypsum fiber plates are prefabricated and are pushed on the construction site only with a groove spring connection. This avoids waiting times for dehydrating the screed as well as moisture in the building.

What is the difference between a double floor and a hollow bottom?

also double-floors are among the system floors because the support layer is stored on the raw floor using support feet. However, in case of cavity floors, the support layer consists of a continuous surface. For this reason, they are also known as surface hollow floors. Access to the installations in the intermediate space takes place only by revision openings or double floor roads.

In den Flächenhohlboden gelangt man nur durch integrierte Revisionsrahmen, deren Position man im Vorfeld gut berechnen sollte. © terra Raumtechnik GmbH / Terra Raumtechnik GmbH In the surface hollow floor one gets only by integrated revision frames, whose position should be calculated in advance.

The modular elements of a double bottom system can be removed individually. This simplifies maintenance in the cavity. On the other hand, the individual plates must move freely to each other to compensate for strains. For this reason, sheet goods is unfavorable as a covering. Tiles are possible, but must be relocated jointly to the floor grid so that no mortar penetrates into the separating joints of the double bottom plates.

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What advantages does a cavity floor offer?

In addition to the flexibility in choosing the covering points of surface hollow floors by other amenities:

cavity floors hold high loads stand, their load-bearing capacity is excellent. As ground systems are cavity floors cheaper for the client than, for example, double floors. Other than double floors can not creak area hollow floors when running Base layer is continuous. Especially wet hollow floors ensure good sound insulation. With pre-refined grooves can be easily integrated in the ground in the floor. Cavory floor systems have very good fire protection properties, since all elements belong to the building material classes A1 and A2. For the construction of dry hollow floors is not a waiting time for drying out necessary from screed surfaces. They are thus suitable for buildings where fast completion is important. The light and thin support layer leaves plenty of space for installations.

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