Final answer:
Winder stairs should have a depth of at least 8 diameters at all points.
Step-by-step explanation:
According to newer recommendations, winder stairs should have a depth of at least 8 diameters at all points. This means that the depth should be 8 times the diameter of the stair's circular base. For example, if the diameter is 2 inches, the depth should be at least 16 inches.