This sketch has three sketches in it. One is a section of one of the stairwells in our newly built construction classroom building. The section is cut through the upper portion of the stair case. In order to show more detail, I did not repeat the lower portion of the staircase. As you could imagine it continues around to the bottom, and looks almost identical.
The second and third sketch are the detail in each step up into the landing. This sketch is the top two stairs into the upper landing. Notice the tread pan shape and where the concrete is poured. Also notice the steel channels in both sketches.







This is the plan sketch of the stairwell. The above sketch is the section if we were to cut the left staircase down the middle and would look towards the left wall.