The size of the stair treads should be adapted to the footwork and depth of adults, which are different in different application environments and are related to their functions.
The dimensions of the treads include height and depth, and the ratio of the height to the depth of the treads is the slope of the stairs. The treads are installed at the same angle to reduce the height or increase the depth of the treads, while extending the length of the stairs, and vice versa can reduce the length of the stairs. In order for everyone to have a comfortable feeling when climbing stairs, the value of the steps can be controlled within a reasonable range.
Practice has proved that the comfortable tread is to appropriately increase the depth of the steps and reduce the height of the steps. Therefore, when designing the stairs, the slope of the stairs should be reduced. When walking, it takes less effort than stepping with a large height and depth. However, the depth should not be too small, and it should be not less than 245 mm, and a depth of 245 mm is sufficient.
The focal point of the foot falls near the sole of the foot, and the heel can also be exerted, and most of the focal point is on the pedal. Therefore, the depth of the steps of the stairs should not be less than 245 mm and not higher than 300 mm. The height of the steps should be no less than 155 mm and no more than 200 mm.
In each section of the same staircase, the height and depth of the steps should be kept consistent, so that the steps when going upstairs and downstairs can be consistent, and it will not give people a feeling of discomfort.
Stairs generally need to consider the number of people passing through to design the width, so as to make the flow of people smooth. The width of stairs for one-way passage is generally designed to be 600 mm or more, the width of stairs for two-way passage should be designed to be 1,200 mm or more, and the stairs for densely-passed passages should be increased to more than 2,400 mm, so that people are not crowded. When the width of the stairs is greater than 1.2 meters, it should be considered to install a handrail at the end close to the wall.
Stair treads can be installed on stairs of various slopes, and are used with various height and width specifications.
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