Balconies precast balcony slabs

A precast balcony slab is a ready-made balcony in concrete of class C35/45 or higher: an element up to 3.0 × 9.0 m and over 18 cm thick, with the fall built into the mould and the drainage components cast in. It is separated thermally from the building structure with proven support systems, which removes the thermal bridge at the slab — including at step-free thresholds.

High manufacturing precision guarantees that every part of the slab surface has a precisely designed fall, which prevents puddles from forming. The quality of the concrete surface helps rainwater drain away.

We produce almost every shape and variant — symmetrical and asymmetrical, rectangular, polygonal, rounded and trapezoidal, including angled sections. On request we supply compatible balustrades and concrete installation props.

We make them as solid slabs: the element arrives on site at its final thickness and needs no structural topping — unlike semi-precast (filigree) balcony slabs, which are reinforced and concreted only on site.

In designs this element is called a balcony slab; in enquiries it also appears as a concrete balcony or a precast balcony slab.

Balconies are installed by crane using cast-in lifting anchors. The threaded holes left after installation are closed with caps.

A balcony slab arrives on site with the fall already built in, the edge finished and the drainage positions prepared. The screed to falls is gone, and the geometry repeats on every storey — on a multi-family building that is several days per floor.

Maximum element size is 3.0 × 9.0 m at a thickness above 18 cm, in concrete class C35/45 or higher. We produce rectangular, polygonal, rounded and trapezoidal shapes, in straight and skew sections — selected shapes need a dedicated mould, which we agree at the quotation stage.

The connection with the structure uses thermal break connectors, which transfer forces while interrupting the continuity of the concrete. This is the standard way of limiting the thermal bridge and the risk of condensation at the junction with the floor.

Installation is by crane, using cast-in lifting anchors. The threaded openings left after installation are closed with caps.

An access walkway and a stair landing are the same type of product as a balcony slab: a flat reinforced concrete element lifted into place by crane, with its finish and details formed in the mould. The Formee tolerance document treats them the same way, covering balconies, walkways and stair landings together.

We supply the landing as a separate element or combined with the stair flight — the choice follows the geometry of the stairwell, the available lifting capacity and whether the stairwell is to serve as the site access route from the first storey. Stair flights are covered by their own product page.

Surfaces can be formed or power-floated. Requirements for falls, texture, slip resistance, drip edges and which surfaces are to be the final finish are set in the design documentation or in the contract — for external walkways this matters exactly as much as it does for a balcony.

Dimensional tolerances are common to the whole group: ±12 mm on length and width, +10/−5 mm on thickness, flatness ±2 mm on a 0.2 m straightedge. The full set is on the manufacturing tolerances page.

The surface type is chosen to meet slip-resistance requirements and the character of the facade. Not every variant is available for every balcony type.

Precast elements are not priced from a per-metre price list — every element is designed for a specific project, and the difference between two projects of the same floor area can reach several tens of percent. So instead of a rate, we explain what actually determines the figure in your offer.

We prepare a quote within about a week of receiving complete documentation: dimensioned floor plans, sections, elevations and the site location with a postcode. The offer covers production, transport and installation — each item is priced separately, so you can see where there is room for savings.

The questions investors and contractors ask most often. Yours is not here? Write to us — we'll give you a straight answer.

Sections and connection details to scale — the same drawings that go into the technical catalogue. Numbers on the drawing refer to the list beside it.

Technical catalogue, installation manual, declaration of performance and FPC certificate — what design and handover call for.

Send us dimensioned floor plans, sections and elevations — we will prepare an element selection, a schedule and a quote. Preparing a quote takes around a week on average. We deliver and install across Poland as well as in Germany, Czechia, Slovakia, Denmark and Sweden.