Helical and curved
One continuous ribbon of plate, bump-formed to the radius. Inner and outer stringers, treads welded in, no visible seams.
Stairs
Stairs that start as a flat plate
Feature stairs are what we are known for. Helical, curved, sawtooth and straight, in plate, channel and tube. We draw them, cut them, form them on our own press brake, weld them, finish them and set them.
Bump-forming
How a helical gets its curve
No rolling mill, no outside forming house. The curve is made on our floor, one hit at a time.
01Model
The stair is modeled in SolidWorks first. The model gives us the flat pattern of every plate, the weight and the bend lines.
02Cut
The flat stringer blanks come off our CNC plasma table, cut from plate up to an inch thick.
03Bump
A shallow hit, move the plate, another hit. Hundreds of them, until the flat plate takes the helix the model asks for.
04Fit and weld
Treads and stringers are fit and welded on fixture tables that hold the stair true while it is welded.
05Set
Our own crew rigs it in and sets it. The people who built the stair bolt it to the building.
What we build
Every kind of stair
Channel and plate stringer
Straight runs on 12 in channel or plate stringers, with landings, clips and the steel that holds it all to the building.
Sawtooth and monostringer
Folded plate treads and a cut stringer that shows the rise and run. Lightweight to the eye, stiff under the foot.
Spiral
Center-column spirals inside and out, from a back-yard fire escape to a showroom feature.
Color as the feature
When the stair is the brand. Blu Dot's tomato-red stair at 715 Lexington connects three showroom levels.
Rails that run clean
Picket, rod, flat bar, mesh and glass guards, with handrails that hold their line through every turn.
Stair work
All work →On the cover, and in the townhouse
Engineering
Drawn, detailed and stamped
Shop drawings come out of SDS/2 as a full detailing set: piece views, assemblies, erection drawings and weld callouts. When the stair needs calculations, our professional engineer reviews and stamps them, so delegated design stays in the same house as the drawings.
