Treads and risers are an important part of the staircases. However, they are counted as an inherent part of the stairs. A tread is the horizontal part of the stair where we put our feet when we walk on them. Usually, there is a generally accepted dept of the tread and it is 9 inches as a minimum. Risers are the vertical part of the steps. They can be open tread stairs or closed tread stairs. Their maximal height should be 8 inches. There are many ways how to connect a tread and a riser (nailed, blocked, glued or joined).
Treads and Risers for Staircases
Finally, watch the tutorial below and learn the calculations.