Data hmasa ber
Ladder san zawng a ni 2.5 m     (2500 mm)
Plan-a staircase sei zawng chu 3 m     (3000 mm)
Step awm zat 13
Step thickness a ni 50 mm
ledge step hrang hrang a awm 50 mm

Stringer stairs a ni
Stringer a sei zawk 3.873 m     (3873 mm)
Ladder angle a awm 39.8°

Step size hrang hrang
Step San zawng a ni 0.192 m     (192 mm)
Step thuk tak a ni 0.281 m     (281 mm)
Riser san zawng a ni 0.142 m     (142 mm)