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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.
Stair stringer size. The stair stringer size can be chosen in the 7 inches for gaining the comfortable step of your stair. The, round the number of the calculation in the previous step for knowing how many steps that you will need in your staircase. Do not forget for writing the height of the steps which is needed. The next step in how to figure stair stringer length is deciding the tread depth or length of the stairs treads.