Stairs precast reinforced concrete

Precast concrete stairs are flights and landings ready for installation, in concrete of class C35/45 or higher. The riser is 15–22 cm, the going 21–32 cm, the flight slab 20–35 cm thick and the flight up to 160 cm wide. The flight is cast in a mould at the factory and, once installed from the first storey up, serves the site crews as the access route for the whole build.

As standard we produce precast stairs with smooth, as-struck surfaces in natural concrete grey. To special order we make them with sandblasted surfaces or in anthracite.

Safety in use is improved by sandblasted strips and anti-slip inserts. Edge trims protect the step nosings from damage and further reduce the risk of slipping.

The production method determines which surfaces remain exposed. In the vertical method, one stringer face is smoothed and the remaining surfaces are as-struck from the mould. In the horizontal method, the underside is lightly smoothed.

They are most often searched for as concrete stairs or ready-made concrete stairs. Precast means the flight is produced in a mould rather than cast on site.

Stair elements are covered by Declaration of Performance 04/26 and produced under Factory Production Control.

DoP 04/26 · Factory Production Control

In the stairwells of residential and office buildings we install single and multi-flight stairs, with or without a landing. The geometry follows the stairwell plan: riser height from 15 to 22 cm, going from 21 to 32 cm, flight width up to 160 cm. The stair slab is 20 to 35 cm thick, in concrete class C35/45 or higher.

We set the flight from the first storey and it immediately becomes the access route for the crew — the element has full strength on delivery, so formwork, reinforcement and weeks of curing on site all disappear. A single flight is placed in under a quarter of an hour, a whole stairwell in a multi-family building usually in one day.

The standard bearing is on a corbel in the floor slab — you will find the detail drawing in the section below. Other bearing arrangements and the design of the connections are agreed with the structural engineer during design.

Inside a building the most common choice is the smooth as-struck surface, ready for a covering. Where the steps are to remain exposed, we produce them in the vertical variant with a smoothed string side, and to special order with a sandblasted surface or in anthracite.

Entrance stairs, terrace stairs and links between site levels are made in the same geometry as an internal flight — what changes is the concrete mix and the surface finish, because the element works through freeze-thaw cycles.

We select the exposure class to suit the environment, in the range XF1 to XF4. Two things decide: how strongly the surface absorbs water, and whether de-icing agents will be used in winter. Steps are horizontal surfaces and collect water differently from vertical elements, and road salt at a building entrance raises the demands on the concrete.

Exposure class, cover to reinforcement and the founding arrangement are agreed with the structural engineer during design — as are the falls on the steps and the drainage, which depend on the geometry of the entrance and the treatment of the ground around the building.

Outdoors it is the safety features that earn their place: a sandblasted surface across the full width of the step or in strips, slip-resistant inserts cast in at the edge zone, and edge protection profiles that shield the nosing from mechanical damage.

A stairwell consists of flights and landings. We supply them as a set or as individual elements — the split depends on the geometry of the stairwell, the available crane capacity and whether the landing is to be combined with the flight or borne separately on the wall.

A flight combined with its landing reduces the number of site connections but is heavier and calls for greater crane reach. Splitting into separate elements gives lighter lifts at the cost of extra joints. We agree the choice with the structural engineer before production starts.

Stairwell walls are supplied as wall elements from the same production run — so the openings for bearing the flights are formed in the mould rather than cut on site. Landings as a product are covered by the balcony page, because they belong to the same tolerance group.

A complete stairwell in a multi-family building normally goes up in a single day of installation. From the first storey it becomes the access route for the crew, which matters in the programme: the following trades do not wait for temporary stairs.

The standard is a smooth, as-struck surface. Additional features improve safety and protect the nosings.

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.