The staircase parameters are selected taking into account safety and ease of use. It is considered that the angle of inclination of the span should not exceed 37-38 º. With a two-span version, the distance between the spans should be at least 10–12 cm. The height of the passage should be about 1.85–2 m. The optimum dimensions of the steps are: height –15–18 cm, width – 24–33 cm (the foot should rest reliably on step). The width of the stairs is chosen based on the availability of space, but the most common is 1-1.2 m. It is not recommended to make less than 80 cm width.
Increased demands are being placed on rail design. The simplest and best option is the location of the span along the wall. In this case, the construction of a railing on one side only is required. The distance between the balusters should be less than the size of the child’s head. (more…)