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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.
If the joist spacing is more than 16 on center you must install new intermediate joists. Stair stringers should be 16 on center for wood decking and 12 on center for most composite decking. If the deck frame is in poor condition it may be easier to tear down the entire deck and rebuilt it from scratch.