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Stair Stringers (7) Stair stringers form the backbone of a set of stairs. By code, stairs need to be at least 36 wide. Although it's usually possible to get away with just using two stringers, we recommend you add a third one down the middle. This extra stringer will ensure your stairs are exceptionally rigid.
Figure 18-15. The stair begins with a riser at the bottom, so extend the last tread line to the back edge of. the stringer. At the top, extend the last tread and. riser line to the back edge. One other adjustment must be made before. the stringer is cut.