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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.
I installed the stair treads with 2 deck screws. The treads are 5/4x6 deck boards, which are 5  wide. The pre-cut stringers have a tread dimension of 11 inches, so two deck boards (or 2x6's) fit exactly.But this leaves no tread overhang, or nosing, which is normal on stairs with enclosed risers. Without the nosing, people tend to stub their feet on the riser, and possibly trip. installed the stair treads with 2 deck screws. The treads are 5/4x6 deck boards, which are 5  wide. The pre-cut stringers have a tread dimension of 11 inches, so two deck boards (or 2x6's) fit exactly.