Stair landing

The stair landing is a load-bearing, horizontal section of a stair system. It serves as a resting and movement area, enables changes in direction between stair flights, and ensures the safe guidance of escape and rescue routes. In reinforced concrete construction, steel construction, and existing buildings, the landing plays a central role in structural analysis, serviceability, and accessibility. During conversions, gutting, or deconstruction of buildings, the stair landing is a structural node where low-vibration methods – such as with concrete crushers or rock and concrete splitters from Darda GmbH – often offer advantages. Sound planning integrates structural checks, building physics, and construction logistics so that function, durability, and safety are maintained throughout all project phases.

Definition: What is meant by a stair landing?

A stair landing is a flat platform within a staircase that interrupts or terminates stair flights. It can be configured as an intermediate landing, corner or turning landing, or as an entry and exit landing. Structurally, the landing transfers live loads into walls, landing beams, columns, or slabs and provides connections for guardrails, door areas, and fit-out elements. Typical construction methods are cast-in-place and precast landings made of reinforced concrete, as well as solutions in steel or (in interior fit-out) in wood. Planning and execution are governed by standards and recognized rules of practice; specific requirements, for example for widths, bearings, or guardrails, depend on the intended use and should be defined for the specific project.

• Functions: rest area and turning space, distribution of traffic flows, barrier-free transition between flights and floors, integration of doors and building services.
• Types: intermediate landing (between flights), turning landing (change of direction), and terminal landings at entry and exit points.
• Interfaces: guardrails and handrails, wall and slab junctions, door thresholds, finishes, and acoustic or waterproofing layers.

Structure and design principles

Reinforced concrete landings usually consist of a landing slab with edge and field reinforcement. Load transfer is via wall bearings, landing beams, corbels, or as a cantilever slab. Joints and bearings between the landing and adjacent components serve acoustic decoupling and crack control. Precast landings are delivered with embedded parts, lifting points, and defined bearings; cast-in-place landings are built monolithically with stair flights or in sections.

• Dynamic behavior: verify vibration comfort and dynamic stiffness for high-traffic or sensitive uses.
• Exposure and durability: detail cover, drainage, and edge protection – particularly for exterior landings subject to moisture, frost, and de-icing salts.
• Tolerances and integration: coordinate geometry with doors, claddings, and floor assemblies so that clear widths and levels are maintained.
• Fire performance: consider required fire resistance, joint sealing, and the continuity of escape routes under fire conditions.

Materials and construction methods

• Cast-in-place concrete: high integration capability, monolithic connection to flights and walls; formwork and construction stages must be considered.
• Precast: short construction time, defined geometry and surfaces; erection, joint grouting, and temporary shoring are relevant for planning.
• Steel/composite: slender constructions with deck plates or grating; often used in technical facilities and industrial buildings.
• Natural stone: used in outdoor areas and existing buildings; load-bearing behavior and slip resistance require particular attention.
• Timber (interior): warm appearance and fast installation; verify fire, vibration, and acoustic performance case by case.

Dimensions, functional requirements, and ergonomics

The sizing of stair landings is based on traffic widths, door situations, escape and rescue routes, and accessibility requirements. Landings must be sufficiently deep to accommodate movement areas in front of doors and at changes of direction. Guardrail and handrail connections must be planned so that the usable width is maintained. Concrete dimensional requirements are usage- and jurisdiction-specific; they should always be defined according to current guidelines and the project-specific safety concept.

• Turning and passing: provide adequate depth for turning movements and simultaneous two-way traffic where required.
• Door integration: consider door leaf swing, clear opening width, and landing depth in front of doors without reducing escape widths.
• Accessibility: ensure level transitions, minimal thresholds, and continuous handrails with tactile or high-contrast markings at edges.
• Slip resistance and drainage: specify suitable surface textures and falls for interior and exterior use, including water management at edges.

Load transfer, connections, and structural analysis

Stair landings collect actions from dead load, live load, guardrail forces, and, where applicable, impact or transport loads. Bearing can be two-way (slab behavior) or one-way (beam behavior). Key detailing points include:

• Bearings: masonry or reinforced concrete walls, steel corbels, landing beams; bearing pressures and settlements must be considered.
• Cracks and joints: deliberate joint layout limits restraint from temperature or shrinkage; elastic bearings improve sound insulation.
• Reinforcement layout: continuous reinforcement into flights or lap-spliced connections over wall crowns; check punching and notch stresses.

For demanding geometries and discontinuities, refined models help to capture local effects and edge stresses. Robustness and redundancy should be verified so that alternative load paths exist in abnormal situations.

• Dynamic and vibration checks: assess natural frequencies and damping for comfort and equipment sensitivity.
• Anchorage and fixings: design and qualify anchors for guardrails and attachments, including edge distances and concrete condition.
• Fire and thermal actions: evaluate restraint and joint behavior under temperature gradients.

Typical damage to stair landings

In existing buildings, damage often occurs at bearings, at landing edges, and in joint areas. Causes include changes of use, moisture ingress, chloride exposure, or acoustic bridges.

• Cracks due to restraint, settlement, or insufficient reinforcement
• Spalling and exposed reinforcement at edges and soffits
• Corrosion of reinforcement, guardrail anchors, and steel corbels
• Vibrations and sound transmission caused by rigid connections

Further causes may include freeze-thaw attack, alkali-silica reaction, or differential movements between flights and landings. A structured condition assessment documents damage patterns, measures cover and carbonation depth, and defines monitoring where necessary.

Dismantling and deconstruction of stair landings

During deconstruction, load-bearing capacity in the construction stage, dust and noise control, and the protection of adjacent components are critical. Low-vibration and precise methods have advantages, especially in occupied buildings, hospitals, and heritage-protected properties.

Sequencing, temporary stabilization, and controlled load paths are essential. Environmental and regulatory aspects – separation of waste streams, noise and vibration limits, and fire safety during hot work – should be addressed in the method statement.

Selective deconstruction with hydraulic tools

• Concrete crushers: enable controlled biting of concrete edges, opening of bearings, and incremental reduction of the landing slab. The reinforcement remains visible and can be cut selectively.
• Rock and concrete splitters: generate separating cracks in the component without percussive vibrations. Suitable for detaching landing areas along defined rows of boreholes, for example in gutting works and concrete cutting or in concrete demolition and special demolition.
• Hydraulic power units: supply the aforementioned tools with the required energy; ensure safe setup, hose routing, and ventilation.
• Steel shears and multi-cutters: cut guardrails, corbels, and exposed reinforcement. For massive profiles, steel shears can be used.

Tool selection should follow a risk assessment, considering access, reinforcement density, required cutting accuracy, and the protection of finishes and adjacent elements.

Procedure (example, non-binding)

1. Define component assessment, shoring concept, and unloading of the landing.
2. Protective measures: dust suppression, fall protection, fire protection, and organization of escape and rescue routes.
3. Pre-separation: remove guardrails and attached elements with multi-cutters or steel shears.
4. Define cut lines: drill holes or create predetermined breaking lines.
5. Release concrete: bite off piece by piece with concrete crushers or split with rock and concrete splitters; expose the reinforcement.
6. Cut reinforcement and secure, lower, and transport away segments.
7. Clean bearings, remove remaining dowels/anchors, and prepare the surface for subsequent measures.
8. Quality assurance: document steps, check residual stability at each stage, and verify that specified tolerances are met.
9. Waste management: separate fractions for recycling and disposal; ensure compliant transport routes and storage areas.
10. Final inspection: review interfaces for follow-on trades and confirm the safe condition of remaining structures.

Installation, assembly, and construction stages

During shell construction/structural work, transport, lifting, temporary shoring, and joint grouting are critical. Precast landings require defined bearing surfaces, tolerances, and controlled load transfer. Fit-out includes slip-resistant finishes, base connections, edge trims, acoustic bearings, and guardrail fixings. For future conversions, a traceable documentation of the landing bearing and connection details is recommended.

• Bearings and grout: prepare level bearing strips or pads, grout joints according to specification, and respect curing times before de-shoring.
• Lifting and handling: use certified lifting points and follow the component’s center of gravity to avoid edge damage.
• Connections: verify torque of mechanical fixings and correct placement of reinforcement continuity systems.
• Handover: record as-built geometry, tolerances, and embedded parts for later maintenance or modifications.

Safety, fire protection, and escape routes

Landings must provide safe movement areas, be free of trip hazards, sufficiently illuminated, and executed with slip resistance. In escape routes, continuous handrails, high-contrast edges, and unobstructed door areas are essential. Fire protection and egress concepts are project-specific; requirements should be coordinated early with planners and experts. For work in existing buildings, the applicable occupational safety rules apply, particularly regarding fall protection, dust, noise, and manual handling routes.

• Wayfinding: ensure clear signage, photoluminescent markings, and consistent handrail guidance.
• Smoke and heat: coordinate with smoke control strategies so that landings remain tenable during evacuation.
• Inspection and maintenance: define cleaning, anti-slip renewal, and periodic checks of guardrails and fixings.

Repair and strengthening

For damaged stair landings, concrete repair, corrosion protection, partial replacement, or strengthening (e.g., bearing enhancement, additional load-bearing elements) may be considered. The removal of damaged concrete can be performed precisely with concrete crushers; for low-vibration separations, rock and concrete splitters are suitable, for example when adjacent walls or finishes must be preserved. Subsequent steps include reprofiling, surface protection, and reinstatement of bearing and guardrail connections. Measures must always be planned project-specifically and executed professionally.

• Local repairs: patch repairs with defined bonding and curing regimes; replace or supplement anchors as required.
• Strengthening: add steel plates or profiles, fiber-reinforced polymers, or supplemental supports – verify anchorage and load paths.
• Serviceability upgrades: improve vibration and acoustic performance with elastic bearings or additional mass where feasible.

Special applications and boundary conditions

In technical facilities, shafts, and tunnel construction, landings are used as maintenance and rescue platforms; confined spaces, ventilation, and the transport of components are defining factors. Low-vibration methods support work during ongoing operations. In outdoor areas and natural stone environments, frost and de-icing salt exposure act on landing surfaces and edges; robust details and slip-resistant surfaces are then particularly important. In special operations with hard-to-access stairwells, compact, hydraulic tools from Darda GmbH can facilitate the safe dismantling or adaptation of landings.

• Seismic and dynamic actions: detail bearings and reinforcement for horizontal loads and impact where relevant.
• Corrosive environments: specify protective systems and stainless or coated fixings near chlorides or chemicals.
• High-traffic facilities: design for wear, cleaning cycles, and rapid maintenance with minimal downtime.