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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.
When forming between walls or other flat surfaces (such as plywood) where you will be able to mark riser locations, positioning risers is easy. Set riser boards to the marks and fasten them to the walls or side boards. If steps are longer than 4 feet, install stringers to support risers and keep stair lines straight. Stringers should support both the top and bottom of each riser board (refer to the diagram). Joe Fettig, owner of Fettig Concrete, Newberg, Ore., uses turnbuckles, which are available at construction supply stores.