A system means you have at least two main structural supports:
Here is the rule of thumb for cut-out stringers: dual stringer stairs
| Feature | Single Stringer (per side) | Dual/Multi Stringer | | :--- | :--- | :--- | | | ~36 inches between supports | 48–72+ inches | | Tread Movement | Noticeable bounce | Solid, zero deflection | | Load Capacity | Standard residential | Heavy residential / commercial | | Risk of Splitting | Moderate (especially at notches) | Low (load is distributed) | A system means you have at least two
By eliminating bulky risers and side walls, dual stringers allow light to flow through the room, making small spaces feel larger and more open. dual stringer stairs are typically .
Unlike prefabricated stair kits, dual stringer stairs are typically .