Precast concrete interlocking stairs

prefabricated concrete staircase

Intervention stairs are prefabricated concrete structures characterized by changing the direction of the run through wedge or fan steps. They are manufactured from concrete class C35/45 in industrial prefabrication technology, ensuring the precise execution of the complex geometry of the interval steps. They are used in staircases of residential, office and industrial buildings as an economical solution for optimal use of space.

For each staircase project, the price is calculated individually based on the dimensions, radius of the staircase, number of steps and surface finish. We guarantee comprehensive technical advice, static calculations and professional installation of prefabricated products. We invite you to get a free quote tailored to the parameters of your staircase.

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Prefabricated staircases – the optimal transportation solution

Intermediate wedge stairs provide an advanced design solution for changing the direction of a staircase run without the need for intermediate landings. Prefabricated concrete elements manufactured under controlled factory conditions guarantee precise execution of the complex geometry of the wedge steps. The prefabrication system allows for precise reproduction of the radius of the treatment and preservation of ergonomic performance.

The production of concrete procedure stairs is based on the use of concrete of minimum class C35/45 with a compressive strength of 45 MPa. The main reinforcement of A-IIIN steel laid according to the distribution of stresses in the treatment zone. Special molding technology makes it possible to obtain perfectly smooth surfaces of the steps without additional finishing.

Types of construction of interlocking stairs

Modular interval stairs consist of individual prefabricated steps mounted on cheek beams or brackets. The modular system allows any shaping of the running line – quarter-turn (90°), half-turn (180°) or full turn. Each step individually made with precise wedge geometry.

A popular solution is a self-supporting interval staircase in the form of monolithic prefabricated runs. The entire run with a treatment cast as a single element with a length of up to 4 meters. The system eliminates the need to assemble individual treads, significantly speeding up implementation. Slab or beam construction adapted to the load of use.

Geometry and parameters of treatment steps

The design of a tread staircase with a tread rest requires the precise layout of wedge steps in the tread zone. The width of the step measured at the run line (30 cm from the inner handrail) is 27-30 cm as a standard. The height of the step 16-18 cm maintained along the entire length of the run. The minimum width of the step at the post 10 cm in accordance with the regulations.

The system of millwork staircase procedure is characterized by an increased angle of inclination of 45-60° while maintaining the procedure. Used in technical rooms and attics with limited space. Special grooving of the surface of the steps provides safety at a steep incline.

Modern prefabrication technologies

Modern interval stairs use advanced technologies of architectural and self-compacting concrete. The possibility of obtaining a variety of textures – from perfectly smooth to structural imitation of natural stone. Concrete coloring in the mass with iron oxide pigments for durable color.

Innovative solutions on how to calculate a treatment staircase use BIM modeling and FEA analysis. Computer simulations allow optimization of reinforcement distribution in stress concentration zones. Automatic generation of detailed documentation from the 3D model.

Advantages of prefabricated interlocking stairs

Save space with a treatment staircase

Intermediate st aircases reduce the area of the staircase by 20-30% compared to straight stairs with treads. Elimination of the intermediate landing allows better use of the building plan. The system is ideal for narrow plots and compact urban development.

Precision of concrete staircases for interventions

The prefabricated concrete interval stairs maintain dimensional tolerances of ±3 mm due to production in steel molds. The ideal geometry of the wedge steps ensures user comfort. The even usable width of the steps on the running line eliminates tripping.

The speed of installation of modular staircase procedure

Modular interlocking stairs assembled at a rate of 1-2 flights per day by a 3-person crew. Prefabrication eliminates time-consuming formwork and concrete on site. Immediate load bearing capacity after installation allows for communicative use.

Durability of the construction of self-supporting stairs of the procedure stairs

Self-supporting interlocking stairs made of C35/45 concrete have a lifespan of more than 100 years. Monolithic construction eliminates play and creaking typical of wooden stairs. Resistance to dynamic and time-varying loads.

Aesthetics of a staircase with a landing

The staircase with a tread rest creates an elegant, flowing running line in the space. Can be made in architectural concrete without additional finishing. The system allows integration of LED lighting in the treads.

Functionality of the millwork staircase of procedure stairs

The miller’s procedure staircase makes it possible to overcome a large height in a small area. The procedure allows for ergonomic guidance despite the steep incline. Ideal for technical rooms and attics.

Innovation of the modern staircase

Modern interval stairs use UHPC concrete with 150 MPa strength for slender structures. Steps as thin as 3-4 cm can be made. Integration of heating systems eliminates icing on outdoor stairs.

Accuracy of the calculation of the staircase of the procedure dimensions

Precision staircase zabieg dimensions designed in CAD/BIM system guarantee perfect fit. Automatic generation of treatment step development. Computer simulations verify user comfort before production.

The use of interlocking stairs in construction

Interval stairs are widely used in all types of building structures, where a change of direction of vertical communication is required with limited space. Prefabricated intervening structures work well in both residential and public buildings. The modular system allows adaptation to a variety of architectural layouts.

Multi-family housing construction

In multifamily buildings, concrete interlocking st airs are the standard solution for staircases. The quarter-run (90°) system is most often used in the corner staircases of point buildings. Prefabricated construction ensures uniform quality in all floors.

Modular procedure stairs allow individual adaptation to unusual cage projections. The possibility of making treatments of different radii in a single flight. The system is particularly appreciated in the revitalization of tenement houses with preservation of the historical layout.

Single-family homes

In private homes, the self-supporting intercalating staircase provides an elegant solution for internal communication. The cantilever design without intermediate supports creates a lightweight effect. The procedure allows the staircase to run smoothly in the limited space of the hall.

The solution of how to lay out a staircase for a house requires taking into account the ergonomics of use by the family. The width of the run a minimum of 90 cm for comfortable passing. The possibility of integrating storage compartments under the stair run.

Public facilities

In schools, offices and hospitals, treatment stairs with a restroom must meet increased safety requirements. Run width of 140-150 cm for free evacuation. Non-slip surface and contrasting marking of the edges of the steps.

The system calculator for intercalated stairs takes into account normative loads of 5 kN/m² for public buildings. Increased reinforcement in dynamic load zones. Construction resistant to intensive use.

Industrial and warehouse buildings

In production halls, the mill stairs are used as access to mezzanines and technical platforms. The structure is adapted to carry small equipment. The procedure makes it possible to bypass installations and technological equipment.

Exterior staircase procedure modern steel and concrete for evacuation from halls. Resistant to weather conditions and snow loads. Perforated steps prevent water and ice accumulation.

Multi-storey parking lots

In underground garages, how to calculate the interval st aircase takes into account fire protection requirements. Interval staircases as escape routes every 60 m. REI 120 reinforced concrete structure made of C35/45 concrete.

Prefabricated intervening staircase dimensions adapted to the 2.5×5.0 m parking module. Minimal interference with parking spaces. Treatment system in the corners of the parking lot for optimal use of space.

Historic and revitalized facilities

In modernized townhouses, how to make a treatment staircase often requires recreating the historic layout. Prefabricated concrete elements imitating stone steps. Possibility of making unusual radii and angles of the treatment.

Communication infrastructure

At train stations and subway stations, treatment stairs connect different levels of platforms. Construction resistant to vibrations from passing trains. Width of 2.5-3.0 m for large passenger streams.

Sports and recreational facilities

In sports halls, concrete procedure stairs lead to stands and mezzanines. It is possible to integrate seating in the construction of the steps. Modular system allows expansion when increasing the capacity of the facility.

High-rise buildings

In high-rise buildings, modular staircases procedure in escape and technical staircases. Prefabrication allows advance installation relative to the main structure. System resistant to deformation of the building under the influence of wind.

Technical parameters of the staircase of the staircase of procedure

Intervention stairs are designed and manufactured in accordance with PN-EN 14843:2009 for precast concrete products – stairs. Static calculations according to PN-EN 1992-1-1 (Eurocode 2) for reinforced concrete structures. All the elements have a CE declaration of performance and a safety B mark.

Material parameters of the structure

Prefabricated concrete interval stairs are made of concrete of minimum class C35/45, standard C40/50. The characteristic compressive strength fck = 40 MPa. Modulus of elasticity Ecm = 35 GPa. Exposure class XC3/XF1 for interior stairs, XC4/XF3 for exterior stairs.

Modular procedure stairs reinforced with steel of class A-IIIN (B500B) with yield strength fyk = 500 MPa. Degree of main reinforcement 1.2-2.0% in the treatment zone, 0.8-1.2% in the straight parts. Reinforcement cover: 25 mm from the usable surface, 30 mm from the rest.

Geometry of treatment steps

The dimensions of the steps in how to draw the staircase of the procedure: height 160-180 mm (optimally 170 mm), width at the line of the run 270-300 mm. Minimum width at the inner post 100 mm. Internal treatment radius minimum 200 mm for comfort.

The calculator system of the intercalated stairs takes into account: the angle of inclination of the run 27-38° (max 42° for technical stairs), the usable width of the run 900-1500 mm, the height of the handrail 900-1000 mm. The number of steps in the run without a treadle max 18 pieces.

Gear design parameters

Self-supporting procedure stairs – the thickness of the running board 120-180 mm, depending on the span. Maximum span of the procedure run 4.5 m. Limit deflection L/250 under service load. Natural frequency > 5 Hz.

Cheek beams in intermediate stairs with tread: cross section 200×400 to 300×600 mm. Thickness of cantilever steps 60-100 mm. Overhang of the step from the beam axis max 1.5 m. Anchoring of the step in the beam min 150 mm.

Standard loads

Loads for milling procedure stairs: service load 3.0 kN/m² for residential buildings, 5.0 kN/m² for public buildings, crowd load 5.0 kN/m², concentrated load 2.0 kN. Dynamic coefficient of 1.4 for prefabricated stairs.

Modern procedure stairs designed for a horizontal handrail load of 1.0 kN/m, vertical load of 0.5 kN/m. Exceptional load (impact) 3.0 kN on an area of 0.1 m². Safety factors according to Eurocode.

Acoustic parameters

Sound insulation how to calculate the staircase of a staircase of a staircase procedure: impact level index Ln,w ≤ 53 dB with lining, Ln,w ≤ 78 dB without lining. Reverberation time in the staircase T ≤ 1.3 s. Airborne sound attenuation Rw ≥ 52 dB.

Fire resistance

Fire resistance class of the staircase intercalation standard dimensions: REI 60 for a thickness of 120 mm, REI 120 for 150 mm, REI 240 for 180 mm. Reinforcement lagging increased to 40 mm for REI 120. reaction to fire class A1 – non-flammable product.

Surface finish

The surface of the steps how to make a staircase of procedure: anti-slip class R10-R11 for interior, R11-R13 for exterior. Roughness Ra = 6-25 μm depending on the texture. It is possible to make 20×5 mm anti-slip grooves.

Dimensional tolerances

Accuracy of manufacturing of staircase running: run length ±10 mm, width ±5 mm, step height ±3 mm. Straightness of edges 3 mm/2m. Flatness of the step surface 3 mm. Radius of the treatment ±10 mm.

Transportation and installation

Transport parameters of concrete interval stairs: weight of run 1,5-3,5 tons, length up to 4,5 m, width up to 1,8 m. Transport in the assembly or vertical position. Sling points in the axis of gravity. Minimum concrete strength at installation 70%.

Installation of the intercalated staircase – instructions for implementation

Correct installation of prefabricated interlocking stairs requires precise preparation of supports, accurate alignment of the geometry of the interlocking, and ensuring stability during installation work. The process is carried out using a crane with the appropriate capacity and overhang. The prefabricated system allows rapid installation of the entire staircase in a few days.

Preparation of support sites

Before the installation of concrete interval stairs, a check is made on the dimensions and levels of the supports. The resting beams or wall supports must reach min. 70% of the design strength. Support surfaces leveled with low-shrinkage mortar with an accuracy of ±5 mm.

For modular procedure stairs, sockets are prepared in the walls of the staircase. Depth of embedment min. 120 mm for steps, 150 mm for cheek beams. Elastomeric pads 10-20 mm thick distribute pressure.

Internal transport and lifting

Elements how to lay out the staircase of the procedure indicate the points of slings for balance. Treads lifted in the installation position with traverses or chain slings. Sling opening angle max 60° to avoid excessive compressive forces.

The system calculator of the staircase procedure determines the weight of the elements: 80-120 kg/modular tread, 1500-3500 kg/monolithic run. Minimum lifting capacity with a 20% margin. Lifting speed of max 2 m/min with intervening elements.

Embedding of treatment gears

Installation of self-supporting procedure stairs begins with the lower flight with precise setting of the angle of the procedure. Geometry control with templates and geodetic measurements. Adjustment tolerance ±5 mm horizontally, ±10 mm vertically.

Successive flights of stairs with a tread rest assembled with the continuity of the line of the flight. The width of the joints between the elements 10-20 mm filled with shrinkage-free mortar. Control of the usable width of the steps in the treatment zone.

Assembly of modular steps

In the system of millwork staircase procedure individual steps arranged from bottom to top. Each step leveled individually with height control. Temporary stabilization with stamps until mortar sets.

Wedge treads of modern treatment stairs require special precision in installation. Preservation of the radius of the treatment controlled by an arch template. Equal distribution of steps in the treatment area for user comfort.

Making structural connections

Connecting reinforcement in how to calculate the stairs of the procedure according to the project – bars φ12-16 mm in sockets. Pouring the joints with C30/37 concrete or expansive mortar. Vibrating for accurate filling of all spaces.

Expansion joints between the treads and the walls of the procedure stairs dimensions 10-20 mm filled with elastic material. Stainless steel expansion profiles on the edges of the steps. The system compensates for thermal deformation and building settlement.

Installation of railings and handrails

After the installation of how to make a staircase of the procedure, system or individual balustrades are installed. Chemical anchors M12-M16 in prefabricated holes or drilled on site. The height of the railing 90-110 cm according to the regulations.

In the treatment area of the treatment stairs, the handrail led smoothly in an arc. Balustrade posts spaced evenly every 10-12 cm for the safety of children. Inner handrail at the wall at a height of 90 cm.

Quality control of the assembly

Acceptance of concrete interval stairs includes: checking the geometry (width of the steps on the running line ±5 mm), checking the height of the steps (±3 mm), measuring the radius of the procedure (±10 mm), verifying the verticality and levels.

Load test of modular procedure stairs with a test load of 5 kN/m² for 24 hours. Measurement of deflections must not exceed L/250. Visual inspection of the formation of cracks. Checking the patency of drains and expansion joints.

Finishing work

Surfaces of self-supporting procedure stairs prepared for laying cladding or painting. Replenish cavities and irregularities with joint compound. Priming with preparations that increase adhesion.

Finishing of interval stairs with a tread can include: stone or ceramic cladding with adhesive, non-slip resin flooring, ground terrazzo, painting with concrete paints. Marking the edges of the steps with a contrasting color.

prefabricated interlocking stairs

Stairway staircase price – comprehensive stair construction calculation

The price of a staircase is shaped by the complexity of the geometry, the dimensions of the structure, the class of concrete and the type of surface finish. The quote includes the cost of custom design, prefabricated production, transportation and installation. Concrete interval staircase price significantly depends on the radius of the interval and the number of wedge steps requiring precise construction.

Cost structure of the treatment stairs

The main component affecting the price of modular treatment stairs is the cost of manufacturing prefabricated elements, which accounts for 55-65% of the value. The price of a single treatment step 250-450 zloty, depending on the width and geometry. How to draw the staircase treatment staircase price of individual design is 5-10% of the total cost.

Transportation and installation calculator of the intercalated stairs price is 25-35% of the outlay. The cost of the crane is 800-1500 PLN/day plus the installation team. Surface finishing is an additional 10-15% with non-slip coatings or cladding.

Price list 2024 for intermediate stairs

In 2024, there is an increase in interest in prefabricated interlocking stairs. Self-supporting procedure stairs price in 2024 for a complete run is 8000-15000 PLN net, depending on the span. Intervention staircase with a treadle price in 2024 increased by 6-8% due to rising production costs.

Current rates in 2024 show that the millwork staircase treatment price is 20-30% lower than the standard one due to the simpler design. Single modular staircases in 2024: simple 180-550 zlotys, treatment staircases 280-750 zlotys. A complete 4-story staircase with treatments 45000-70000 zlotys.

Price forecast for 2025

Predictions for 2025 indicate price stabilization in the prefabricated stair segment. The price of modern interlocking stairs in 2025 may increase by 3-5% mainly due to energy costs. The introduction of new acoustic standards may raise costs by an additional 2-3%.

3D printing technology for complex treatment geometries is expected to become widespread in 2025. How to calculate a treatment staircase price in 2025 will be automatic thanks to online configurators. The development of BIM will reduce design costs by 15-20%.

Cost comparison of different systems

The analysis shows that the dimensions of a prefabricated staircase are 30-40% cheaper than monolithic stairs poured on site. Steel procedure stairs cheaper by 20%, but require finishing and have worse acoustics. How to make a treatment staircase price in traditional masonry technology is 2 times higher.

Solid wood intercalated stairs cost 150-200% of the price of precast concrete stairs. Glass intervening stairs cost 300-500% more. Composite intervening stairs compete on price, but have fire restrictions.

Optimizing the cost of the treatment structure

Reduction of the expense of the staircase procedure price possible by using typical procedure radii (1.5m; 2.0m; 2.5m). Avoidance of atypical angles of the procedure (the most economical 90° and 180°). Use of standard widths of gears 100, 120, 140 cm.

Savings on concrete staircase procedure price by abandoning architectural concrete in favor of standard for painting. Using typical system balustrades instead of individual ones. Grouping of transportation for several staircases.

Costs of operating a staircase with a stairway

Exploitation modular staircase procedure price of maintenance minimal – cleaning and painting every 5-7 years (PLN 200-400/run). No maintenance of the structure for 50 years. Possible cladding repairs 50-100 PLN/m².

Modernization of self-supporting staircases procedure price of replacing balustrades after 25 years 150-300 zł/mb. Renovation of anti-slip surfaces every 10-15 years 80-150 PLN/stair. Total cost in 100-year life cycle lowest among all technologies.

Financing and discounts

The system of procedure staircase with a tread will have a lower price when you buy the whole staircase than a single piece. Seasonal promotions milling staircase with tread price in the winter period (November-March) reduction of 5-10%. Quantity discounts above 10 runs. Regular customers receive preferential terms and priority fulfillment.

Comprehensive pricing of modern staircase procedure staircase price requires analysis of the architectural design and determination of geometric parameters. Individual solutions can significantly differ in price. We offer free consulting and preliminary calculation.

The final how to calculate the price of each project’s treatment st aircase requires consideration of local installation conditions, crane availability and finishing requirements. We encourage you to contact us to prepare a detailed quote for a treatment staircase tailored to your facility.

Here are just some of our implementations of prefabricated interlocking stairs. This list includes only large investments on which our prefabricated products have appeared.

What are ?

Precast concrete units are prefabricated building components produced off-site that can be assembled into larger structures at the project site. These are standard, repetitive modules produced in series at industrial plants, which greatly speed up and facilitate construction work in various construction sectors.

What are the types of ?

Reinforced concrete. prestressed concrete, post-tensioned concrete – 20+ types

What is the use of ?

Rapid modular construction of various structures

What are the properties of the ?

Repeatability, precision, speed of installation, durability

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