Four different concrete ceilings and their construction in comparison

The construction of a concrete ceiling depends on the ceiling system, concrete and steel are always involved. Sometimes cavities or insulating materials are added, often also cable ducts. Read here how the prestressed precast floor, the in-situ concrete floor, the concrete hollow stone ceiling and the filigree ceiling are constructed - and which properties result from this.

Construction of a precast prestressed concrete floor

The standard molded parts of the prestressed precast concrete slab have cavities inside, which reduce their own weight and enable better thermal insulation. In the cavities and heat-insulating materials can be introduced. Prestressing steels are firmly integrated between two concrete slabs in a kind of sandwich construction.

The steel inserts are made of high-strength prestressing steel, which keeps the ceiling tensioned. In this way, even large rooms without intermediate pillars can be bridged. The prestressed precast ceiling normally has visible joints, which, however, may optically disappear in the course of a subsequent treatment.

Building a ceiling of in-situ concrete

In-situ concrete is poured on site, ie directly at the construction site, into the formwork. This method enables a precise production of all individual parts. An in-situ concrete floor consists of solid, steel-reinforced concrete without cavities. It is not suitable for thermal insulation.

The reinforcement can be very different, it is calculated by a structural engineer and poured directly into the concrete. The casting takes place mostly in several layers, fitting for the respective floor plan.

Construction of a concrete hollow stone ceiling

This ceiling type consists of prefabricated hollow stones on metal girders with concrete base. It is placed on the building by crane and then poured with concrete. Floor slabs usually have wooden slats on the underside that carry a later ceiling cladding.

Building a filigree corner

A filigree corner is a semi-finished ceiling made of reinforced concrete. Each semi-finished part has on its underside a reinforcement of lattice girders and steel mesh mats. In addition, the elements delivered to the site included a visible upper flange, two submerged bars and connecting diagonals.

On the construction site, the concrete ceiling elements are usually provided with a transverse reinforcement and cast with in-situ concrete. The concrete cover should be at least 1 cm thick.

Tips & Tricks

In order to subsequently provide a concrete floor with thermal insulation, dressing with plasterboard is recommended. In the substructure, the insulation boards are simply clamped.