Tread
The horizontal walking surface of a step, whose depth, finish and edge decide how safely and comfortably a staircase is climbed.
A tread is the horizontal, walkable part of a step, the surface your foot lands on. In Slovak it is called nástupnica. Each tread sits above a riser, and together the treads and risers make up the steps of a staircase flight. Its depth, its front edge and its finish decide how a staircase feels underfoot, how safe it is in wet or dusty conditions, and how much noise it passes into the building.
How does a tread differ from a riser?
The tread is the horizontal part of a step and the riser is the vertical part. A closed riser hides the space below each tread, while an open riser leaves it visible, and that choice changes both the look and the feel of the stair. The two are designed as a pair, because the height of each rise and the depth of each tread together determine how easy the stair is to climb. Treads also belong to the wider staircase, so their layout has to be settled with the stair as a whole, not as a finish added at the end.
What is the difference between tread depth and going?
The going is the horizontal distance a step covers from one riser to the next. The tread depth is the physical depth of the tread board itself. A nosing is the front edge of the tread, and where it overhangs the riser below, the overlap gives the foot extra usable depth without making the board deeper. This is why the two figures do not always match, and why a drawing should say which one it refers to.
The relationship between tread and riser is set by the Slovak technical standard for stairs. Qualitatively, a deeper tread suits a lower rise, and a steeper rise calls for a more generous tread. The exact values belong to the standard and to the project's own calculation, not to this article.
| Term | What it measures | Why it matters |
|---|---|---|
| Tread depth | Physical depth of the tread board | Describes the material you buy and fix |
| Going | Horizontal distance from one riser to the next | Drives the walking geometry of the stair |
| Nosing overlap | Projection of the front edge past the riser below | Adds usable foot depth and changes the visible edge |
| Rise | Vertical height of each step | Set together with the going to shape comfort |
Which materials are used for treads?
Treads are made from timber, stone, concrete or steel, and each carries different consequences for weight, maintenance and sound. The table below compares the usual options for a residential stair.
| Material | Strengths | Watch-outs | Where it fits |
|---|---|---|---|
| Solid oak (dub) | Warm, durable, can be sanded and refinished | Moves with humidity, needs acclimatising before finishing | Traditional or warm interiors with a timber stringer |
| Engineered wood | More dimensionally stable, real hardwood top layer | Thin top layer limits how often it can be sanded | Stairs in rooms with changing humidity |
| Natural stone | Hard wearing, low maintenance, premium look | Heavy, cold underfoot, needs a checked slip rating | Entrances and stairs where the structure can carry the mass |
| Concrete with a finish | Integrates with an in-situ stair, very durable | Finish must be chosen for grip, hard surface transmits noise | Solid stairs cast with the structure |
| Steel | Slim profile, light, can be open or solid | Needs corrosion protection, can ring and transmit sound | Light, contemporary stairs and mezzanines |
Stone and concrete add mass that the structure must take into account from the outset, while timber is more sensitive to moisture than either.
How is slip resistance managed on a tread?
Slip resistance comes from the finish, the edge and the way water leaves the surface. A polished stone or a glossy lacquered oak tread can be slippery when wet, while a sanded or textured surface gives more grip. An anti-slip nosing is an insert or strip set into the front edge, where the foot pushes off and where a slip is most likely to happen.
Slip resistance is measured with test methods in the relevant standards, and suppliers should declare the result for the finish they actually sell. A surface that looks textured is not automatically safe, so ask for the declared value and check it again after cleaning products and wear have had their effect.
| Measure | How it works | Trade-off |
|---|---|---|
| Anti-slip nosing insert | Adds grip at the edge where the foot pushes off | Adds a profile and needs care around the insert |
| Textured or sanded finish | Raises friction across the whole surface | Can collect dust and is harder to keep clean |
| Glossy lacquer | Easy to clean and attractive | Least grip when wet, usually the wrong choice for entrances |
| Carpet runner | Adds grip and softens footfall | Needs a secure fixing and regular cleaning |
Why do timber treads on concrete stairs transmit noise?
A tread fixed directly to a concrete flight creates a rigid path between the foot and the structure. Each step sends a short impact into the concrete, which carries it through the stair and into the floors and walls around it. Footfall on a timber tread can be heard in rooms far from the stair, and it is a common complaint with concrete stairs, even when the stair is structurally sound.
The fix is to break that rigid path. Resilient strips or pads placed between the tread and the concrete, or fixings that separate the tread from the structure, reduce how much impact energy passes through. The same logic underlies impact sound insulation in floors, and a stair should be checked against the same concern. The result depends on the detail and the surroundings, so check it in the drawings rather than trusting the material alone.
How do treads work on a cantilevered staircase?
On a cantilevered staircase, each tread is itself the structural member. It projects from the wall with no stringer or post underneath, so the tread must carry its own load and transfer it into the wall through its fixing. That makes the connection as important as the visible finish.
Material choice matters more here. A heavy stone tread adds dead load to the wall, while a thin steel plate is lighter but has to be stiff enough not to bounce. The wall should be designed for the staircase from the start, so treads on this type belong in the structural discussion with the engineer, not in a catalogue selection made at the end.
What should be checked on treads before ordering?
- Whether the dimension in the drawings refers to tread depth or to going, and whether the nosing is included.
- The declared slip performance of the actual finish, not of a sample that was polished for display.
- The nosing profile and its fixing, decided before the flight is cast or fabricated.
- How each tread is fixed to the structure, and what separates it from the flight to limit noise.
- For a cantilevered stair, that the wall and the fixings have been designed with the structural engineer.
Frequently asked questions
- Should a staircase be specified by tread depth or by going?
- Specify the measure the staircase geometry is built on, and state it explicitly in the drawings. The going is the horizontal distance from one riser to the next, while the tread depth is the physical depth of the board. Where a nosing overhangs, the two can differ, so a drawing that does not say which one it means invites disagreement at the fabrication stage.
- Which tread material is the right choice for a family house?
- There is no single right answer. Solid oak suits a warm, traditional interior but needs time to settle and a finish that is maintained. Engineered wood offers a similar look with better dimensional stability. Concrete with a finish or natural stone suits a durable, low-maintenance stair, provided the structure can carry the weight and the finish has a declared slip performance.
- Do treads always need anti-slip nosings?
- Not always, but they are a sensible choice wherever the surface is smooth, glossy or likely to get wet, such as entrances and external stairs. The nosing should be designed in with the tread, because it is simpler to plan for than to retrofit. Confirm the declared slip performance of the finished stair rather than assuming it.
- Why are footsteps on my timber treads so loud on a concrete stair?
- Timber treads fixed rigidly to concrete carry impact sound straight into the structure, which spreads it into nearby rooms. Resilient pads or strips between the tread and the concrete, together with fixings that separate the two, reduce this. Addressing the fixing is more reliable than trying to mask the noise with a floor finish.
- Can a cantilevered staircase use any tread material?
- Most materials can be used, but the weight and stiffness of each tread determine how the wall is loaded and how much the tread may bend. Heavy stone or thick concrete treads add load to the wall, while thin steel or timber treads need enough stiffness to avoid visible deflection. The material should be agreed with the structural design of the wall from the beginning.