1, indoor steps should be 150×300; outdoor steps should be about 350 wide, and the height-to-width ratio should not be greater than 1:2.5

2, the width of residential common stair treads should not be less than 0.26M, and the height of the treads should not be greater than 0.175M

3, the width of residential ladder segments should not be less than 1.1M (6 floors and the following one side of the The width of residential ladder section should not be less than 1.1M (1.0M for 6 floors and below with balustrade on one side), and the headroom height is 2.2M

4, the design scheme of small high staircase and the standard reference of stair treads

5, the height and width of steps should be designed according to the gradient of steps and the size of the human feet.

1> Stairs slope range between 20 to 45 degrees (should not exceed 38 degrees), that is, between 1:2.75 ~ 1:1.

6, 2> the width of the tread should be human feet can all fall on the tread surface is appropriate, the height value should also be appropriate to ensure that the stairs have the right slope.

7, 3> the height of the stair treads should not be greater than 210mm, and should not be less than 140mm, the height of the treads at all levels should be the same, 4> the width of the stair treads, should be used 220, 240, 260, 280, 300, 320mm.