1, the highest step of the spiral staircase, the height from the ceiling needs to be greater than1.8m..

2. For domestic stairs, the pedal length should be controlled at1.2m. ..

3. The distance between railings should be less than12.5cm. ..

4. The height of handrails should be kept between 85 and 90 cm.

5. The height and depth of the ladder are between 15 and 18 cm.

Pay attention to the following points when installing the spiral staircase:

1. In order to walk safely, all the stairs should be kept the same size and the height should be controlled at the same size. If it is necessary to change the distance between stairs for special reasons, the distance between two stairs shall not exceed 4 cm.

2. If the distance between the top floor pedal and the ceiling is relatively low, it will lead to inconvenient travel, and if the stairs are too high, it will also make the normal use space sag.

3. If possible, you can install lighting on the stairs, which is suitable for walking at night, mainly with soft and clear light.

4. If there are old people or children at home, it is necessary to install anti-skid measures or put anti-skid mats on the stairs. Yoshiya real estate encyclopedia, buying a house needs more knowledge.