Bela Abolfathi, D. S. Aguado, Gabriela Aguilar, Carlos Allende Prieto, Andres Almeida, Tonima Tasnim Ananna, Friedrich Anders, Scott F. Anderson, Brett H. Andrews, Borja Anguiano, Alfonso Aragon-Salamanca, Maria Argudo-Fernandez, Eric Armengaud, Metin Ata, Eric Aubourg, Vladimir Avila-Reese, Carles Badenes, Stephen Bailey, Christophe Balland, Kathleen A. Barger, et al (328)
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.
Note that since there is a mid-level landing in this design, the Total Run results do not apply. The Total Run only applies to a single straight run of stairs. The height of each step is 6 7/8 inches. The mid-level landing counts as a step in this design. Both upper stair stringers and lower stair stringers have the same number of treads. It doesn't have to be this way, you can place a landing anywhere along the stair run that serves your needs.