Initial data
Stair height 2.5 m     (2500 mm)
Length a di staircase opening inna plan 3 m     (3000 mm)
Number a steps 13
Step thickness 50 mm
Overhang a steps 50 mm

Stair stringer
Stringer length 3.873 m     (3873 mm)
Stair angle 39.8°

Step sizes
Step height 0.192 m     (192 mm)
Step depth 0.281 m     (281 mm)
Riser height 0.142 m     (142 mm)