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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.
How to Install a Precut Deck Stair Stringer. Use deck boards that match the deck as treads for the stairs. Typical deck stairs consist of wooden treads attached to stringers. The stairs may be installed between two levels of a deck or from one edge of a deck and a concrete stoop at the lower end.