the minimum distance from the intersection of the tread and bottom edge of the riser to the lower edge of the stringer; the minimum is between 3-1/2 and 5 inches; also effective depth of rabbet.
the minimum distance from the intersection of the tread and bottom edge of the riser to the lower edge of the stringer; the minimum is between 3-1/2 and 5 inches; also effective depth of rabbet.