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.
1 Adjust the height until the height and steps balance out (since you can't have a half or quarter of a step). 2  Take the number of steps and multiply that by 10.5 inches (266.7 mm). 3  That gives you the length of stair stringer necessary. 4  Take that length and project it out from the deck.d. 2. Measure the height of the stair from the bottom of the decking -- or top of the floor joist -- to the ground and then divide by the 7-to-8 inches (175-to- 200 mm). This will give you the number of steps you will need to make.