Steel spiral staircase arrangement
The spiral layout places the treads around a central support, each turning toward the next to make a continuous route from the lower floor to the upper landing. The steel stair is designed around the building opening, with column, tread connections and supports drawn for the project.
The direction of travel matters as much as the diameter. Clockwise or counterclockwise ascent changes where the first tread starts and where the user reaches the upper floor. The landing connects that final position to the surrounding floor. Its shape, usable exit and relationship to any door are settled with the plan before individual steel pieces are scheduled.
The stair railing follows the outside of the spiral and continues into the scheduled landing protection. Handrail profile, infill arrangement and connections are defined with the stair geometry. Guarding around the remaining floor opening is a separate length to record.
Steel grade, preparation and coating system are specified for the location, while color and sheen describe the surface. The order records the finish and the treatment of exposed connections, weld areas and any site touch-up.
A spiral tread narrows toward the center column. Its useful walking area therefore depends on more than the outside edge width. The tread outline, walking-line dimensions, riser arrangement and surface treatment are coordinated together. Open treads, added coverings or a different infill require their own detail.
The upper landing and railing connect to the floor edge and surrounding construction, with connection plates, joint locations and any opening guard in the component schedule. A continuous-looking handrail still needs a defined fabrication and installation plan, including where pieces join and how the ends finish.
| Stair configuration | Custom center-support steel spiral staircase; radial treads, upper landing and railing included to the agreed component schedule. |
|---|---|
| Package selection | Custom steel center-support spiral staircase with scheduled treads, upper landing and railing; dimensions, connections, surface treatment and supplied components defined for the project. |
| Finished height | Lower finished floor to upper finished floor in mm, including both floor build-ups; intermediate structural levels also recorded. |
| Plan geometry | Overall stair diameter, actual floor-opening shape and dimensions, rotation, lower entry and upper exit positions recorded in mm and on plan. |
| Tread and railing detail | Tread count and outline, riser arrangement, walking-line dimensions, headroom, handrail and guard requirements resolved for the project. |
| Steel and surface | Steel grade, member sections, tread surface, finish system and connection details specified on the project schedule. |
| Supports and supply | Column base, landing support, structural fixing interfaces, component quantities, packing and installation responsibilities itemized; project engineering and local acceptance separate. |
| Minimum order | Supplied in full packing units from one production batch, rounded up from your area. Small lots can ship with the rest of your project list in one container. |
| Standards & certificates | Matched to the ordered model: tell us the standards or certificates your market or project requires, and we confirm in writing which documents are available for this configuration before you order. |
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The height is measured between finished floors, including the floor layers at both ends. That dimension sets the rise to be divided through the stair. Headroom is checked where the turning route passes beneath the upper floor and landing. A stair that fits a circle on plan can still conflict with the floor edge above it.
Stair diameter and floor opening are recorded as two dimensions, and the opening must take the railing, floor edge and clear route. The plan also shows lower entry, ascent direction and upper exit, with nearby walls, doors and furniture that could get in the way.
The lower base and upper landing need defined support from the building. Floor construction, edge distances, connection locations and load paths are reviewed by the responsible project designer. The supplied steelwork is coordinated with those details.
Floor height, stair diameter and landing position determine the geometry and steelwork schedule. A wider stair is not simply the same assembly with a larger handrail. Tread outlines, connections, railing lengths and packing sizes can all change with the selected layout.
The quote follows the agreed member sections, tread construction and finish system, with special surface treatments, coverings and site finishing as options. The color is priced with its full preparation and coating.
The component list covers the center support, treads, landing, handrail, infill and agreed connection parts, with any extra guard around the upstairs opening measured on its own and fasteners and anchors listed where included.
The largest piece and the planned assembly joints affect packing, freight and site access, and delivery destination, unloading and the route into the building go into the quotation. Building supports, lifting, assembly, final fixing and local inspection are assigned to site trades. Tell us the rooms and quantities and we will put this on one quote with everything else you are ordering, and show you what fits in a container.
It is a custom component package made for your project. The order lists the center support, treads, landing, railing and agreed connection parts, with geometry and assembly divisions developed for the actual building dimensions and access.
Use the distance from the lower finished floor to the upper finished floor, recorded in millimeters. Include the floor build-up at both ends. Structural slab levels alone can give a different rise, so they are kept separate from the finished height used for the stair layout.
Stair diameter is the stair footprint; the opening also has to take the railing, floor edge, landing and clear route, and their relationship is shown on the project plan.
Clockwise or counterclockwise ascent is a project layout choice. The selected direction must connect a usable lower entry to the upper landing without conflicting with walls or doors. Rotation is established before the tread and railing pieces are scheduled.
Only the guard lengths and components listed in the quotation are included. Stair railing, landing protection and guarding along the remaining floor opening are different portions of the layout. The opening perimeter is measured so any additional guard can be identified explicitly.
Yes. We design the stair to the tread size, headroom, guard height and loads your local code requires, and supply shop drawings and structural calculations for your engineer's approval.
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