Standard geometry
Mono-stringer stairs
Single central steel stringer; treads bolted to it.
- Single central steel stringer
- Treads top-mounted with hidden hardware
- Industrial / contemporary look
- Steel work coordinated with engineer
- Est. 198739 yrs
- Family-Owned
- Veteran-Owned
- 4.8★ Verified
- Lehigh Valley
Definition
What is a mono-stringer stair?
A mono-stringer stair carries every tread on one central steel beam running up the middle of the run, with treads top-mounted on hidden hardware. The single spine gives an industrial, contemporary look and is engineered and coordinated with a steel fabricator.
Built & reviewed by Snyder Stairs · Whitehall, PA · Est. 1987 · Updated June 2026
How it compares
How does a turn-style stair save space?
The trade-off across the turning configurations is footprint versus comfort. A landing is easiest to walk; a winder is the most compact. Here is where each one sits.
| Configuration | Turns on | Footprint | Best for |
|---|---|---|---|
| L-shape | Flat square landing | Largest of the turns | Comfort, code rest point |
| Winder | Pie-shaped treads | Most compact | Tight footprints, basements |
| Switch-back | Mid-landing, 180° | Stacked / vertical | Apartments, stair towers |
| Curved | Custom-radius arc | Open sweep | Formal foyers, statement |
Mono-stringer stairs FAQs
Common questions about mono-stringer stairs.
Q: What's the difference between a mono-stringer and a floating stair?
A mono-stringer carries the treads on one visible central steel beam; a floating stair hides its support entirely in the wall or behind the treads. Both read modern, but the mono-stringer makes the steel spine a deliberate part of the look.
Q: Who fabricates the steel stringer?
The steel beam is engineered and made by a steel fabricator we coordinate with; we cut, fit, and mount the wood treads to it. The two trades are sequenced together so the treads land true on the finished beam.
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Custom stairs and railings, built in Whitehall.
Custom stairs and railings, built by a family of Pennsylvania craftsmen for nearly forty years. We'll give you a realistic budget on the first call — not a teaser, not a pressure-close. Get in touch, or send a few photos.
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