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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.
The sides of the stairs, or stringers, are cut from 2x12 boards. Using a framing square, mark out the portions to be cut away from the stringer. Starting at the top corner of the board, place the square so that one leg is 7.46 (the rise) and the other is at 10â (the tread) (Image 1).