The height of the railing plate should ensure that the height of the slope and the treads (parts) is 1050mm, 1100mm and 1200mm. When the height of the railing board is 1050mm, it is suitable for the residences with six floors and less than six floors, and the buildings with overhead height of less than 24m (not suitable for school accommodation, specific buildings and specific parts); When the height of the railing board is 1100mm, it is suitable for residential buildings with seven floors and above, specific buildings (nursery schools, primary and secondary schools, residential buildings for the elderly), and buildings with overhead height of 24m and above (excluding school dormitories and specific parts); When the height of the railing board is 1200mm, it is suitable for specific parts (school, commercial, hospital, hotel and other building atrium places) and school dormitory.

The classification of civil buildings according to the number of floors or height shall comply with the following provisions:

1. Residential buildings are classified according to the number of floors: Floor to Floor 3 is low-rise residential, Floor 4 to Floor 6 is multi-storey residential, Floor 7 to Floor 9 is medium and high-rise residential, Floor 10 and above is high-rise residential:

2. Except for residential buildings, single-storey, low-rise and multi-storey civil buildings with a height of less than 24m are high-rise buildings (excluding single-storey public buildings with a height of more than 24m):

3. Civil buildings with a building height of more than 100m are super high-rise buildings.

The stair rail

The stair railings in this atlas are classified as follows according to different materials, installation methods and uses: metal railings, wooden railings, reinforced concrete railings, masonry railings, nursery railings and handrails against the wall.

The stair plane form, the height and width of the step, the starting form, the water retaining and the surface practice are determined by the engineering design. The height of the indoor stair railing: the vertical clear height of the top of the stair handrail to the front edge of the step decoration surface line is generally not less than 900mm. The height of the horizontal handrail of the indoor stairs in primary and secondary schools is 1100mm; In other buildings, when the length of the horizontal handrail on the side of the stair well exceeds 500mm, the height of the horizontal handrail on the indoor stair is not less than 1050mm. The railing from the floor or roof 0.10m height should not be left empty.

Height of outdoor stair railing: the vertical clear height from the top surface of outdoor stair railing to the leading edge of the decoration surface line of the step is not less than 1100mm.

Children's handrails should be set on both sides of the nursery and kindergarten ladder at a net height of 600mm; Handrails should be set at least on one side of stairs in other buildings. When the width of stairs reaches three streams of people, handrails should be set on both sides. When reaching four streams of people, middle handrails should be set up in primary and secondary schools.

Residential, nurseries, kindergartens, primary and secondary schools, shops and other children often used stair railings shall not be easy to climb the structure and decoration, should be used vertical railings, vertical railings bar net distance <110mm; When the width of the ladder well is greater than 110mm, measures must be taken to prevent children from sliding.

Note: The height of the railing is calculated from the floor and roof to the vertical height of the top surface of the railing handrail. If there is a footable part at the bottom with a width greater than 0.22m and a height lower than 0.40m, it should be calculated from the top surface of the footable part.