Building components · Stairs & Level Change
Ramp Flight
Explains the ramp flight as a level-change position in its own right — a continuous slope rather than a set of steps — and what that continuity means for its surface, its edges and its drainage.
Educational reference entry. What this element has to do, and whether any particular arrangement of it is adequate, depends on the whole assembly, the loading, the exposure, local requirements, the manufacturer's instructions and qualified professional design.
Overview
What a ramp flight is
A ramp flight is a continuous inclined surface joining two levels. Unlike a stair, it has no repeated rhythm of step and no discrete elements to set out: it is one unbroken plane, and anything crossing it — a wheel, a trolley, a foot — is in continuous contact with it the whole way.
That continuity is what makes it a distinct position rather than a sloping piece of floor. The surface is walked and wheeled on at an incline, so how it behaves underfoot is a different question from how the same surface behaves laid level; water runs along it rather than sitting on it; and its two ends are junctions between a slope and a level surface, which are the points where the transition is felt and where the construction is most often resolved badly.
Boundaries
How it differs from nearby elements
The distinctions that keep this entry from being a restatement of its neighbours.
- It is not a stair flight. A stair changes level in discrete steps, each set out from the last, and is described through treads, risers and the members carrying them; a ramp flight has none of those positions and is instead one continuous plane whose steepness is constant along its length.
- It is not a stair landing. A landing is level by definition and exists to interrupt a change of height; a ramp flight is inclined by definition and exists to make that change without interruption. A ramp route commonly contains both, which is why they are separate positions.
- It is not a door threshold. A threshold is the narrow junction at a doorway where inside meets outside and where weathering, drainage and level are resolved in a short distance; a ramp flight is the approach that arrives at that junction, and the two commonly meet without being the same thing.
Terminology
Common names and aliases
These names describe the same element. The library keeps one entry per component so that a trade term or a regional name never becomes a second, thinner page.
- ramp run
- sloping flight
- access ramp
- ramp section
Dependencies
What it depends on
What has to be right elsewhere for this element to do its job.
- What it is laid on or cast as, since the inclined plane and the structure that holds the incline are separate decisions that are frequently made as one.
- What supports it — a cast slab, a framed structure, or a prepared ground build-up — since the slope has to be carried as well as formed.
- How its surface behaves when inclined and when wet, which is a different question from how the same surface behaves laid level.
- How it meets level surfaces at the top and the bottom, because those two transitions are where the change of gradient is experienced and where water is either carried away or delivered inside.
Considerations
Topics that genuinely apply here
Subjects worth discussing about this element. These are discussion topics, never measured values, ratings or performance claims.
Water runs down a ramp rather than sitting on it, so the design question is where the flow is taken at the bottom rather than whether the surface drains.
An external ramp is exposed along its whole length and its lowest point is where water, silt and debris collect, which is also where the route reaches a building.
Wear on a ramp is concentrated by the direction of travel rather than spread across the surface, and the transitions at each end take more of it than the middle.
A ramp joining a structure to external ground crosses a boundary between two things that move differently, and that boundary has to be allowed for rather than simply covered over.
Materials
Commonly formed from
Material families this element is commonly realised in. This states common practice only — it is not a statement that any of these materials suits this component in a particular building, which depends on the whole assembly and on qualified review.
Assemblies
Building systems this element is met in
The role this component fills inside each assembly. A role describes what the element does there — it is not a statement that this component suits that system in any particular building.
Clarifications
Commonly misunderstood
- That a ramp is a stair without the steps. It is a different position with different governing issues: continuity of surface, drainage along the slope and the transitions at each end, none of which arise in the same way on a stair.
- That the same surface behaves the same way laid level and laid to a slope. How a surface performs underfoot, how water moves across it and how it wears all change with inclination.
Conversations
Questions for qualified professionals
Questions worth asking someone with the project in front of them. This page cannot answer them.
- What supports this ramp along its length, and does that support differ at the ends from the middle?
- Where does water running down the ramp go at the bottom, and what keeps it away from the building it approaches?
- How are the transitions at the top and the bottom of the flight formed?
- Who is this route intended to serve, and what local requirements has the arrangement been assessed against?
Go deeper
Related Build Design Hub guides
Planning guidance behind the decisions this element involves.
Preparation
Related planning checklists
Owner-side preparation before the conversation where this element comes up.
What this entry does not do
- This entry describes a position, not a design. It states no gradient, length, width, landing interval, surface classification, load capacity or fire rating, and none can be inferred from it.
- Whether a ramp arrangement satisfies the access requirements applying to a building is a design and compliance determination made by qualified professionals against local requirements.
Stair & Level Change Elements
The positions that make up a stair and the elements that carry people safely between levels — treads, risers, the members beneath them, and the guarding at the edge.
Browse all stairs & level change entries →