1. Examine the stair well opening for a set of stairs. The stairwell opening is the opening from the top stair until the person passes through the floor. A. What is

the distance from the tread to the ceiling where the stairs pass through the second floor of first floor to basement? B. What is the width of the tread, and the depth of the tread from the riser to the nosing of the tread? width depth 3. What is the height of the riser?