Double Stringer Flight
By Huu Khanh Nguyen · Updated October 28, 2026 · stair, flight
A straight stair flight carried by two uncut structural sections under the treads, parallel to the pitch line, each tread held on a mount bracket at both ends.
Parameters
| Name | Default | Unit |
|---|---|---|
| Number of risers (the flight has risers - 1 treads) | 13 | |
| Riser height | 175 | mm |
| Going, nosing to nosing (y) | 250 | mm |
| Width of the flight, tread length (x) | 1000 | mm |
| Tread nosing overhang passed to the tread (y) | 10 | mm |
| Tread thickness passed to the tread (z) | 44 | mm |
| Stringer section width across the flight (x) | 50 | mm |
| Stringer section depth normal to the slope | 100 | mm |
| Stringer position: distance from the flight edge to the stringer outer face (x), 0 = at the sides | 0 | mm |
| Tread mount bracket length along the tread (y) | 150 | mm |
| Tread seating: gap between the tread underside and the stringer top at the tread rear (z) | 20 | mm |
| Finish of the stringers and brackets | white | |
| Width | width | mm |