Double Stringer Stairs Jun 2026

1. Measure floor-to-floor height. 2. Divide by 7 → round to nearest integer for # of risers. 3. Compute actual rise. 4. Compute run: T = 25 – 2R. 5. Total run = (n_treads × T). 6. Cut 2 identical stringers from 2×12. 7. Verify residual notch depth ≥ 5″ (actually 3.5″ min). 8. Install with hangers and bottom support. 9. Add treads/risers. 10. Inspect headroom and nosing projection.

15 treads × 11.75″ = 176.25″ (14′8¼″) double stringer stairs

When designing double stringer stairs, several factors must be considered: double stringer stairs

: Over-cutting stringers (especially with a circular saw) is the #1 cause of stair failure. Finish corners with handsaw. double stringer stairs