Slab stairs are composed of step boards, platform boards and platform beams.
The stair board is an inclined board with steps. The inclined plate is supported on the upper and lower platform beams, and the lower end of the subfloor is supported on the ridge wall.
The advantages of slab stairs are that the lower surface of the stair slab is flat and the formwork support is simple; Its disadvantage is that when the span of stepped slab is large, the thickness of inclined slab is large and the amount of structural materials is large.
Therefore, slab stairs are suitable for situations where the variable load is small and the span of stair slab is generally less than 3m.