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Stair-a building used as a component for vertical traffic between floors. Used for transportation links between floors and when the height difference is large. Stairs are also set up in multi-storey and high-rise buildings with elevators and escalators as the main vertical means of transport. Despite the use of elevators as the main vertical means of transport, high-rise buildings still have to keep stairs for escape in the event of a fire. The staircase consists of a continuous cascade of ladders (also known as Ladder running), a platform (rest platform) and a retaining member. The horizontal projection distance between the lowest and highest steps of the staircase is the ladder length, and the total height of the ladder is ladder height.

In staircase construction, installation workers often go wrong due to a problem: staircase size. Because the height on the decoration design is not the same as in the building structure diagram, the height of the building structure does not contain the thickness of the decorative layer size, need to be calculated separately. A stair designer. For high layers often do not consider the use of building structure drawings of the height, and do not calculate the decorative layer factors, so in order to avoid such errors, decorators should first use ink lines to eject the height of the decorative layer, and then the surveyor needs to re-measure the layer height.

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