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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.
The minimum tread depth is 10 and the maximum riser height is 8. In most cases this will be a 7-1/2 rise and 10-1/2 run. This will allow you to use two deck boards for each tread with a 1/2 reveal.Once you have determined the total stair height, tread depth, and riser height you can plug the numbers into the decks.com stair stringer calculator to find the stringer length, stair projection, and the angle of the stairs.his will allow you to use two deck boards for each tread with a 1/2 reveal. Once you have determined the total stair height, tread depth, and riser height you can plug the numbers into the decks.com stair stringer calculator to find the stringer length, stair projection, and the angle of the stairs.